/src/php-src/ext/standard/array.c

Source
/*
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Rasmus Lerdorf <rasmus@php.net>                             |
   |          Andrei Zmievski <andrei@php.net>                            |
   |          Stig Venaas <venaas@php.net>                                |
   |          Jason Greene <jason@php.net>                                |
   +----------------------------------------------------------------------+
*/

#include "php.h"
#include "php_ini.h"
#include <stdarg.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <string.h>
#include "zend_globals.h"
#include "zend_interfaces.h"
#include "php_array.h"
#include "basic_functions.h"
#include "php_string.h"
#include "php_math.h"
#include "zend_smart_str.h"
#include "zend_bitset.h"
#include "zend_exceptions.h"
#include "ext/random/php_random.h"
#include "zend_frameless_function.h"

/* {{{ defines */

#define DIFF_NORMAL     1
#define DIFF_KEY      2
#define DIFF_ASSOC      6
#define DIFF_COMP_DATA_NONE    -1
#define DIFF_COMP_DATA_INTERNAL 0
#define DIFF_COMP_DATA_USER     1
#define DIFF_COMP_KEY_INTERNAL  0
#define DIFF_COMP_KEY_USER      1

#define INTERSECT_NORMAL    1
#define INTERSECT_KEY     2
#define INTERSECT_ASSOC     6
#define INTERSECT_COMP_DATA_NONE    -1
#define INTERSECT_COMP_DATA_INTERNAL 0
#define INTERSECT_COMP_DATA_USER     1
#define INTERSECT_COMP_KEY_INTERNAL  0
#define INTERSECT_COMP_KEY_USER      1
/* }}} */

ZEND_DECLARE_MODULE_GLOBALS(array)
PHPAPI zend_class_entry *sort_direction_ce;

/* {{{ php_array_init_globals */
static void php_array_init_globals(zend_array_globals *array_globals)
{
  memset(array_globals, 0, sizeof(zend_array_globals));
}
/* }}} */

PHP_MINIT_FUNCTION(array) /* {{{ */
{
  ZEND_INIT_MODULE_GLOBALS(array, php_array_init_globals, NULL);

  return SUCCESS;
}
/* }}} */

PHP_MSHUTDOWN_FUNCTION(array) /* {{{ */
{
#ifdef ZTS
  ts_free_id(array_globals_id);
#endif

  return SUCCESS;
}
/* }}} */

static zend_never_inline ZEND_COLD int stable_sort_fallback(Bucket *a, Bucket *b) {
  if (Z_EXTRA(a->val) > Z_EXTRA(b->val)) {
    return 1;
  } else if (Z_EXTRA(a->val) < Z_EXTRA(b->val)) {
    return -1;
  } else {
    return 0;
  }
}

#define RETURN_STABLE_SORT(a, b, result) do { \
  int _result = (result); \
  if (EXPECTED(_result)) { \
    return _result; \
  } \
  return stable_sort_fallback((a), (b)); \
} while (0)

/* Generate inlined unstable and stable variants, and non-inlined reversed variants. */
#define DEFINE_SORT_VARIANTS(name) \
  static zend_never_inline int php_array_##name##_unstable(Bucket *a, Bucket *b) { \
    return php_array_##name##_unstable_i(a, b); \
  } \
  static zend_never_inline int php_array_##name(Bucket *a, Bucket *b) { \
    RETURN_STABLE_SORT(a, b, php_array_##name##_unstable_i(a, b)); \
  } \
  static zend_never_inline int php_array_reverse_##name##_unstable(Bucket *a, Bucket *b) { \
    return php_array_##name##_unstable(a, b) * -1; \
  } \
  static zend_never_inline int php_array_reverse_##name(Bucket *a, Bucket *b) { \
    RETURN_STABLE_SORT(a, b, php_array_reverse_##name##_unstable(a, b)); \
  } \

static zend_always_inline int php_array_key_compare_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  zval first;
  zval second;

  if (f->key == NULL && s->key == NULL) {
    return (zend_long)f->h > (zend_long)s->h ? 1 : -1;
  } else if (f->key && s->key) {
    return zendi_smart_strcmp(f->key, s->key);
  }
  if (f->key) {
    ZVAL_STR(&first, f->key);
  } else {
    ZVAL_LONG(&first, f->h);
  }
  if (s->key) {
    ZVAL_STR(&second, s->key);
  } else {
    ZVAL_LONG(&second, s->h);
  }
  return zend_compare(&first, &second);
}
/* }}} */

static zend_always_inline int php_array_key_compare_numeric_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  if (f->key == NULL && s->key == NULL) {
    return (zend_long)f->h > (zend_long)s->h ? 1 : -1;
  } else {
    double d1, d2;
    if (f->key) {
      d1 = zend_strtod(f->key->val, NULL);
    } else {
      d1 = (double)(zend_long)f->h;
    }
    if (s->key) {
      d2 = zend_strtod(s->key->val, NULL);
    } else {
      d2 = (double)(zend_long)s->h;
    }
    return ZEND_THREEWAY_COMPARE(d1, d2);
  }
}
/* }}} */

static zend_always_inline int php_array_key_compare_string_case_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  const char *s1, *s2;
  size_t l1, l2;
  char buf1[MAX_LENGTH_OF_LONG + 1];
  char buf2[MAX_LENGTH_OF_LONG + 1];

  if (f->key) {
    s1 = f->key->val;
    l1 = f->key->len;
  } else {
    s1 = zend_print_long_to_buf(buf1 + sizeof(buf1) - 1, f->h);
    l1 = buf1 + sizeof(buf1) - 1 - s1;
  }
  if (s->key) {
    s2 = s->key->val;
    l2 = s->key->len;
  } else {
    s2 = zend_print_long_to_buf(buf2 + sizeof(buf2) - 1, s->h);
    l2 = buf2 + sizeof(buf2) - 1 - s2;
  }
  return zend_binary_strcasecmp(s1, l1, s2, l2);
}
/* }}} */

static zend_always_inline int php_array_key_compare_string_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  const char *s1, *s2;
  size_t l1, l2;
  char buf1[MAX_LENGTH_OF_LONG + 1];
  char buf2[MAX_LENGTH_OF_LONG + 1];

  if (f->key) {
    s1 = f->key->val;
    l1 = f->key->len;
  } else {
    s1 = zend_print_long_to_buf(buf1 + sizeof(buf1) - 1, f->h);
    l1 = buf1 + sizeof(buf1) - 1 - s1;
  }
  if (s->key) {
    s2 = s->key->val;
    l2 = s->key->len;
  } else {
    s2 = zend_print_long_to_buf(buf2 + sizeof(buf2) - 1, s->h);
    l2 = buf2 + sizeof(buf2) - 1 - s2;
  }
  return zend_binary_strcmp(s1, l1, s2, l2);
}
/* }}} */

static int php_array_key_compare_string_natural_general(Bucket *f, Bucket *s, bool fold_case) /* {{{ */
{
  const char *s1, *s2;
  size_t l1, l2;
  char buf1[MAX_LENGTH_OF_LONG + 1];
  char buf2[MAX_LENGTH_OF_LONG + 1];

  if (f->key) {
    s1 = f->key->val;
    l1 = f->key->len;
  } else {
    s1 = zend_print_long_to_buf(buf1 + sizeof(buf1) - 1, f->h);
    l1 = buf1 + sizeof(buf1) - 1 - s1;
  }
  if (s->key) {
    s2 = s->key->val;
    l2 = s->key->len;
  } else {
    s2 = zend_print_long_to_buf(buf2 + sizeof(buf2) - 1, s->h);
    l2 = buf2 + sizeof(buf2) - 1 - s2;
  }
  return strnatcmp_ex(s1, l1, s2, l2, fold_case);
}
/* }}} */

static int php_array_key_compare_string_natural_case(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_key_compare_string_natural_general(a, b, true));
}
/* }}} */

static int php_array_reverse_key_compare_string_natural_case(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_key_compare_string_natural_general(b, a, true));
}
/* }}} */

static int php_array_key_compare_string_natural(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_key_compare_string_natural_general(a, b, false));
}
/* }}} */

static int php_array_reverse_key_compare_string_natural(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_key_compare_string_natural_general(b, a, false));
}
/* }}} */

static zend_always_inline int php_array_key_compare_string_locale_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  const char *s1, *s2;
  char buf1[MAX_LENGTH_OF_LONG + 1];
  char buf2[MAX_LENGTH_OF_LONG + 1];

  if (f->key) {
    s1 = f->key->val;
  } else {
    s1 = zend_print_long_to_buf(buf1 + sizeof(buf1) - 1, f->h);
  }
  if (s->key) {
    s2 = s->key->val;
  } else {
    s2 = zend_print_long_to_buf(buf2 + sizeof(buf2) - 1, s->h);
  }
  return strcoll(s1, s2);
}
/* }}} */

static zend_always_inline int php_array_data_compare_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  int result = zend_compare(&f->val, &s->val);
  /* Special enums handling for array_unique. We don't want to add this logic to zend_compare as
   * that would be observable via comparison operators. */
  zval *rhs = &s->val;
  ZVAL_DEREF(rhs);
  if (UNEXPECTED(Z_TYPE_P(rhs) == IS_OBJECT)
   && result == ZEND_UNCOMPARABLE
   && (Z_OBJCE_P(rhs)->ce_flags & ZEND_ACC_ENUM)) {
    zval *lhs = &f->val;
    ZVAL_DEREF(lhs);
    if (Z_TYPE_P(lhs) == IS_OBJECT && (Z_OBJCE_P(lhs)->ce_flags & ZEND_ACC_ENUM)) {
      // Order doesn't matter, we just need to group the same enum values
      uintptr_t lhs_uintptr = (uintptr_t)Z_OBJ_P(lhs);
      uintptr_t rhs_uintptr = (uintptr_t)Z_OBJ_P(rhs);
      return lhs_uintptr == rhs_uintptr ? 0 : (lhs_uintptr < rhs_uintptr ? -1 : 1);
    } else {
      // Shift enums to the end of the array
      return -1;
    }
  }
  return result;
}
/* }}} */

static zend_always_inline int php_array_data_compare_numeric_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  return numeric_compare_function(&f->val, &s->val);
}
/* }}} */

static zend_always_inline int php_array_data_compare_string_case_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  return string_case_compare_function(&f->val, &s->val);
}
/* }}} */

static zend_always_inline int php_array_data_compare_string_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  return string_compare_function(&f->val, &s->val);
}
/* }}} */

static int php_array_natural_general_compare(Bucket *f, Bucket *s, bool fold_case) /* {{{ */
{
  zend_string *tmp_str1, *tmp_str2;
  zend_string *str1 = zval_get_tmp_string(&f->val, &tmp_str1);
  zend_string *str2 = zval_get_tmp_string(&s->val, &tmp_str2);

  int result = strnatcmp_ex(ZSTR_VAL(str1), ZSTR_LEN(str1), ZSTR_VAL(str2), ZSTR_LEN(str2), fold_case);

  zend_tmp_string_release(tmp_str1);
  zend_tmp_string_release(tmp_str2);
  return result;
}
/* }}} */

static zend_always_inline int php_array_natural_compare_unstable_i(Bucket *a, Bucket *b) /* {{{ */
{
  return php_array_natural_general_compare(a, b, false);
}
/* }}} */

static zend_always_inline int php_array_natural_case_compare_unstable_i(Bucket *a, Bucket *b) /* {{{ */
{
  return php_array_natural_general_compare(a, b, true);
}
/* }}} */

static int php_array_data_compare_string_locale_unstable_i(Bucket *f, Bucket *s) /* {{{ */
{
  return string_locale_compare_function(&f->val, &s->val);
}
/* }}} */

DEFINE_SORT_VARIANTS(key_compare);
DEFINE_SORT_VARIANTS(key_compare_numeric);
DEFINE_SORT_VARIANTS(key_compare_string_case);
DEFINE_SORT_VARIANTS(key_compare_string);
DEFINE_SORT_VARIANTS(key_compare_string_locale);
DEFINE_SORT_VARIANTS(data_compare);
DEFINE_SORT_VARIANTS(data_compare_numeric);
DEFINE_SORT_VARIANTS(data_compare_string_case);
DEFINE_SORT_VARIANTS(data_compare_string);
DEFINE_SORT_VARIANTS(data_compare_string_locale);
DEFINE_SORT_VARIANTS(natural_compare);
DEFINE_SORT_VARIANTS(natural_case_compare);

static bucket_compare_func_t php_get_key_compare_func(zend_long sort_type)
{
  switch (sort_type & ~PHP_SORT_FLAG_CASE) {
    case PHP_SORT_NUMERIC:
      return php_array_key_compare_numeric;

    case PHP_SORT_STRING:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_key_compare_string_case;
      } else {
        return php_array_key_compare_string;
      }

    case PHP_SORT_NATURAL:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_key_compare_string_natural_case;
      } else {
        return php_array_key_compare_string_natural;
      }

    case PHP_SORT_LOCALE_STRING:
      return php_array_key_compare_string_locale;

    case PHP_SORT_REGULAR:
    default:
      return php_array_key_compare;
  }
  return NULL;
}

static bucket_compare_func_t php_get_key_reverse_compare_func(zend_long sort_type)
{
  switch (sort_type & ~PHP_SORT_FLAG_CASE) {
    case PHP_SORT_NUMERIC:
      return php_array_reverse_key_compare_numeric;

    case PHP_SORT_STRING:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_reverse_key_compare_string_case;
      } else {
        return php_array_reverse_key_compare_string;
      }

    case PHP_SORT_NATURAL:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_reverse_key_compare_string_natural_case;
      } else {
        return php_array_reverse_key_compare_string_natural;
      }

    case PHP_SORT_LOCALE_STRING:
      return php_array_reverse_key_compare_string_locale;

    case PHP_SORT_REGULAR:
    default:
      return php_array_reverse_key_compare;
  }
  return NULL;
}

static bucket_compare_func_t php_get_data_compare_func(zend_long sort_type) /* {{{ */
{
  switch (sort_type & ~PHP_SORT_FLAG_CASE) {
    case PHP_SORT_NUMERIC:
      return php_array_data_compare_numeric;

    case PHP_SORT_STRING:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_data_compare_string_case;
      } else {
        return php_array_data_compare_string;
      }

    case PHP_SORT_NATURAL:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_natural_case_compare;
      } else {
        return php_array_natural_compare;
      }

    case PHP_SORT_LOCALE_STRING:
      return php_array_data_compare_string_locale;

    case PHP_SORT_REGULAR:
    default:
      return php_array_data_compare;
  }
  return NULL;
}

static bucket_compare_func_t php_get_data_reverse_compare_func(zend_long sort_type) /* {{{ */
{
  switch (sort_type & ~PHP_SORT_FLAG_CASE) {
    case PHP_SORT_NUMERIC:
      return php_array_reverse_data_compare_numeric;

    case PHP_SORT_STRING:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_reverse_data_compare_string_case;
      } else {
        return php_array_reverse_data_compare_string;
      }

    case PHP_SORT_NATURAL:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        return php_array_reverse_natural_case_compare;
      } else {
        return php_array_reverse_natural_compare;
      }

    case PHP_SORT_LOCALE_STRING:
      return php_array_reverse_data_compare_string_locale;

    case PHP_SORT_REGULAR:
    default:
      return php_array_reverse_data_compare;
  }
  return NULL;
}

static bucket_compare_func_t php_get_data_compare_func_unstable(zend_long sort_type, bool reverse) /* {{{ */
{
  switch (sort_type & ~PHP_SORT_FLAG_CASE) {
    case PHP_SORT_NUMERIC:
      if (reverse) {
        return php_array_reverse_data_compare_numeric_unstable;
      } else {
        return php_array_data_compare_numeric_unstable;
      }
      break;

    case PHP_SORT_STRING:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        if (reverse) {
          return php_array_reverse_data_compare_string_case_unstable;
        } else {
          return php_array_data_compare_string_case_unstable;
        }
      } else {
        if (reverse) {
          return php_array_reverse_data_compare_string_unstable;
        } else {
          return php_array_data_compare_string_unstable;
        }
      }
      break;

    case PHP_SORT_NATURAL:
      if (sort_type & PHP_SORT_FLAG_CASE) {
        if (reverse) {
          return php_array_reverse_natural_case_compare_unstable;
        } else {
          return php_array_natural_case_compare_unstable;
        }
      } else {
        if (reverse) {
          return php_array_reverse_natural_compare_unstable;
        } else {
          return php_array_natural_compare_unstable;
        }
      }
      break;

    case PHP_SORT_LOCALE_STRING:
      if (reverse) {
        return php_array_reverse_data_compare_string_locale_unstable;
      } else {
        return php_array_data_compare_string_locale_unstable;
      }
      break;

    case PHP_SORT_REGULAR:
    default:
      if (reverse) {
        return php_array_reverse_data_compare_unstable;
      } else {
        return php_array_data_compare_unstable;
      }
      break;
  }
  return NULL;
}
/* }}} */

PHPAPI zend_long php_count_recursive(HashTable *ht) /* {{{ */
{
  zend_long cnt = 0;
  zval *element;

#ifdef ZEND_CHECK_STACK_LIMIT
  if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
    zend_call_stack_size_error();
    return -1;
  }
#endif

  if (!(GC_FLAGS(ht) & GC_IMMUTABLE)) {
    if (GC_IS_RECURSIVE(ht)) {
      php_error_docref(NULL, E_WARNING, "Recursion detected");
      /* A user error handler may have thrown. */
      return EG(exception) ? -1 : 0;
    }
    GC_PROTECT_RECURSION(ht);
  }

  cnt = zend_hash_num_elements(ht);
  ZEND_HASH_FOREACH_VAL(ht, element) {
    ZVAL_DEREF(element);
    if (Z_TYPE_P(element) == IS_ARRAY) {
      zend_long sub_cnt = php_count_recursive(Z_ARRVAL_P(element));
      if (UNEXPECTED(sub_cnt < 0)) {
        cnt = -1;
        break;
      }
      cnt += sub_cnt;
    }
  } ZEND_HASH_FOREACH_END();

  GC_TRY_UNPROTECT_RECURSION(ht);
  return cnt;
}
/* }}} */

/* Consumes `zv` */
static zend_always_inline zend_long php_get_long(zval *zv)
{
  if (EXPECTED(Z_TYPE_P(zv) == IS_LONG)) {
    return Z_LVAL_P(zv);
  } else {
    zend_long ret = zval_get_long_func(zv, false);
    zval_ptr_dtor(zv);
    return ret;
  }
}

/* {{{ Count the number of elements in a variable (usually an array) */
PHP_FUNCTION(count)
{
  zval *array;
  zend_long mode = PHP_COUNT_NORMAL;
  zend_long cnt;

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ZVAL(array)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(mode)
  ZEND_PARSE_PARAMETERS_END();

  if (mode != PHP_COUNT_NORMAL && mode != PHP_COUNT_RECURSIVE) {
    zend_argument_value_error(2, "must be either COUNT_NORMAL or COUNT_RECURSIVE");
    RETURN_THROWS();
  }

  switch (Z_TYPE_P(array)) {
    case IS_ARRAY:
      if (mode != PHP_COUNT_RECURSIVE) {
        cnt = zend_hash_num_elements(Z_ARRVAL_P(array));
      } else {
        cnt = php_count_recursive(Z_ARRVAL_P(array));
        if (UNEXPECTED(cnt < 0)) {
          RETURN_THROWS();
        }
      }
      RETURN_LONG(cnt);
    case IS_OBJECT: {
      zval retval;
      /* first, we check if the handler is defined */
      zend_object *zobj = Z_OBJ_P(array);
      if (zobj->handlers->count_elements) {
        RETVAL_LONG(1);
        if (SUCCESS == zobj->handlers->count_elements(zobj, &Z_LVAL_P(return_value))) {
          return;
        }
        if (EG(exception)) {
          RETURN_THROWS();
        }
      }
      /* if not and the object implements Countable we call its count() method */
      if (instanceof_function(zobj->ce, zend_ce_countable)) {
        zend_function *count_fn = zend_hash_find_ptr(&zobj->ce->function_table, ZSTR_KNOWN(ZEND_STR_COUNT));
        zend_call_known_instance_method_with_0_params(count_fn, zobj, &retval);
        if (Z_TYPE(retval) != IS_UNDEF) {
          RETVAL_LONG(php_get_long(&retval));
        }
        return;
      }
    }
    ZEND_FALLTHROUGH;
    default:
      zend_argument_type_error(1, "must be of type Countable|array, %s given", zend_zval_value_name(array));
      RETURN_THROWS();
  }
}
/* }}} */

static void php_natsort(INTERNAL_FUNCTION_PARAMETERS, bucket_compare_func_t sort_fn)
{
  HashTable *array;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_HT_EX(array, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  zend_array_sort(array, sort_fn, false);

  RETURN_TRUE;
}

/* {{{ Sort an array using natural sort */
PHP_FUNCTION(natsort)
{
  php_natsort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_array_natural_compare);
}
/* }}} */

/* {{{ Sort an array using case-insensitive natural sort */
PHP_FUNCTION(natcasesort)
{
  php_natsort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_array_natural_case_compare);
}
/* }}} */

typedef bucket_compare_func_t(*get_compare_function)(zend_long);

static zend_always_inline void php_sort(INTERNAL_FUNCTION_PARAMETERS, get_compare_function get_cmp, bool renumber) {
  HashTable *array;
  zend_long sort_type = PHP_SORT_REGULAR;
  bucket_compare_func_t cmp;

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ARRAY_HT_EX(array, 0, 1)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(sort_type)
  ZEND_PARSE_PARAMETERS_END();

  cmp = get_cmp(sort_type);

  zend_array_sort(array, cmp, renumber);

  RETURN_TRUE;
}

/* {{{ Sort an array and maintain index association */
PHP_FUNCTION(asort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_data_compare_func, false);
}
/* }}} */

/* {{{ Sort an array in reverse order and maintain index association */
PHP_FUNCTION(arsort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_data_reverse_compare_func, false);
}
/* }}} */

/* {{{ Sort an array */
PHP_FUNCTION(sort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_data_compare_func, true);
}
/* }}} */

/* {{{ Sort an array in reverse order */
PHP_FUNCTION(rsort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_data_reverse_compare_func, true);
}
/* }}} */

/* {{{ Sort an array by key value in reverse order */
PHP_FUNCTION(krsort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_key_reverse_compare_func, false);
}
/* }}} */

/* {{{ Sort an array by key */
PHP_FUNCTION(ksort)
{
  php_sort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_get_key_compare_func, false);
}
/* }}} */

static inline int php_array_user_compare_unstable(Bucket *f, Bucket *s) /* {{{ */
{
  zval args[2];
  zval retval;

  ZVAL_COPY_VALUE(&args[0], &f->val);
  ZVAL_COPY_VALUE(&args[1], &s->val);

  BG(user_compare_fci).param_count = 2;
  BG(user_compare_fci).params = args;
  BG(user_compare_fci).retval = &retval;
  zend_call_function(&BG(user_compare_fci), &BG(user_compare_fci_cache));

  if (UNEXPECTED(Z_TYPE(retval) == IS_FALSE || Z_TYPE(retval) == IS_TRUE)) {
    if (!ARRAYG(compare_deprecation_thrown)) {
      php_error_docref(NULL, E_DEPRECATED,
        "Returning bool from comparison function is deprecated, "
        "return an integer less than, equal to, or greater than zero");
      ARRAYG(compare_deprecation_thrown) = 1;
    }

    if (Z_TYPE(retval) == IS_FALSE) {
      /* Retry with swapped operands. */
      ZVAL_COPY_VALUE(&args[0], &s->val);
      ZVAL_COPY_VALUE(&args[1], &f->val);
      zend_call_function(&BG(user_compare_fci), &BG(user_compare_fci_cache));

      zend_long ret = php_get_long(&retval);
      return -ZEND_NORMALIZE_BOOL(ret);
    }
  }

  zend_long ret = php_get_long(&retval);
  return ZEND_NORMALIZE_BOOL(ret);
}
/* }}} */

static int php_array_user_compare(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_user_compare_unstable(a, b));
}
/* }}} */

#define PHP_ARRAY_CMP_FUNC_VARS \
  zend_fcall_info old_user_compare_fci; \
  zend_fcall_info_cache old_user_compare_fci_cache \

#define PHP_ARRAY_CMP_FUNC_BACKUP() \
  old_user_compare_fci = BG(user_compare_fci); \
  old_user_compare_fci_cache = BG(user_compare_fci_cache); \
  ARRAYG(compare_deprecation_thrown) = 0; \
  BG(user_compare_fci_cache) = empty_fcall_info_cache; \

#define PHP_ARRAY_CMP_FUNC_RESTORE() \
  BG(user_compare_fci) = old_user_compare_fci; \
  BG(user_compare_fci_cache) = old_user_compare_fci_cache; \

static void php_usort(INTERNAL_FUNCTION_PARAMETERS, bucket_compare_func_t compare_func, bool renumber) /* {{{ */
{
  zval *array;
  zend_array *arr;
  PHP_ARRAY_CMP_FUNC_VARS;

  PHP_ARRAY_CMP_FUNC_BACKUP();

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_EX2(array, 0, 1, 0)
    Z_PARAM_FUNC(BG(user_compare_fci), BG(user_compare_fci_cache))
  ZEND_PARSE_PARAMETERS_END_EX( PHP_ARRAY_CMP_FUNC_RESTORE(); return );

  arr = Z_ARR_P(array);
  if (zend_hash_num_elements(arr) == 0)  {
    PHP_ARRAY_CMP_FUNC_RESTORE();
    RETURN_TRUE;
  }

  /* Copy array, so the in-place modifications will not be visible to the callback function */
  arr = zend_array_dup(arr);

  zend_array_sort(arr, compare_func, renumber);

  zval garbage;
  ZVAL_COPY_VALUE(&garbage, array);
  ZVAL_ARR(array, arr);
  zval_ptr_dtor(&garbage);

  PHP_ARRAY_CMP_FUNC_RESTORE();
  RETURN_TRUE;
}
/* }}} */

/* {{{ Sort an array by values using a user-defined comparison function */
PHP_FUNCTION(usort)
{
  php_usort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_array_user_compare, true);
}
/* }}} */

/* {{{ Sort an array with a user-defined comparison function and maintain index association */
PHP_FUNCTION(uasort)
{
  php_usort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_array_user_compare, false);
}
/* }}} */

static inline int php_array_user_key_compare_unstable(Bucket *f, Bucket *s) /* {{{ */
{
  zval args[2];
  zval retval;

  if (f->key == NULL) {
    ZVAL_LONG(&args[0], f->h);
  } else {
    ZVAL_STR(&args[0], f->key);
  }
  if (s->key == NULL) {
    ZVAL_LONG(&args[1], s->h);
  } else {
    ZVAL_STR(&args[1], s->key);
  }

  BG(user_compare_fci).param_count = 2;
  BG(user_compare_fci).params = args;
  BG(user_compare_fci).retval = &retval;
  zend_call_function(&BG(user_compare_fci), &BG(user_compare_fci_cache));

  if (UNEXPECTED(Z_TYPE(retval) == IS_FALSE || Z_TYPE(retval) == IS_TRUE)) {
    if (!ARRAYG(compare_deprecation_thrown)) {
      php_error_docref(NULL, E_DEPRECATED,
        "Returning bool from comparison function is deprecated, "
        "return an integer less than, equal to, or greater than zero");
      ARRAYG(compare_deprecation_thrown) = 1;
    }

    if (Z_TYPE(retval) == IS_FALSE) {
      /* Retry with swapped operands. */
      if (s->key == NULL) {
        ZVAL_LONG(&args[0], s->h);
      } else {
        ZVAL_STR(&args[0], s->key);
      }
      if (f->key == NULL) {
        ZVAL_LONG(&args[1], f->h);
      } else {
        ZVAL_STR(&args[1], f->key);
      }

      zend_call_function(&BG(user_compare_fci), &BG(user_compare_fci_cache));

      zend_long ret = php_get_long(&retval);
      return -ZEND_NORMALIZE_BOOL(ret);
    }
  }

  zend_long result = php_get_long(&retval);
  return ZEND_NORMALIZE_BOOL(result);
}
/* }}} */

static int php_array_user_key_compare(Bucket *a, Bucket *b) /* {{{ */
{
  RETURN_STABLE_SORT(a, b, php_array_user_key_compare_unstable(a, b));
}
/* }}} */

/* {{{ Sort an array by keys using a user-defined comparison function */
PHP_FUNCTION(uksort)
{
  php_usort(INTERNAL_FUNCTION_PARAM_PASSTHRU, php_array_user_key_compare, false);
}
/* }}} */

static inline HashTable *get_ht_for_iap(zval *zv, bool separate) {
  if (EXPECTED(Z_TYPE_P(zv) == IS_ARRAY)) {
    return Z_ARRVAL_P(zv);
  }

  ZEND_ASSERT(Z_TYPE_P(zv) == IS_OBJECT);
  php_error_docref(NULL, E_DEPRECATED,
    "Calling %s() on an object is deprecated", get_active_function_name());

  zend_object *zobj = Z_OBJ_P(zv);
  if (separate && zobj->properties && UNEXPECTED(GC_REFCOUNT(zobj->properties) > 1)) {
    if (EXPECTED(!(GC_FLAGS(zobj->properties) & IS_ARRAY_IMMUTABLE))) {
      GC_DELREF(zobj->properties);
    }
    zobj->properties = zend_array_dup(zobj->properties);
  }
  return zobj->handlers->get_properties(zobj);
}

static zval *php_array_iter_seek_current(HashTable *array, bool forward_direction)
{
  zval *entry;

  while (true) {
    if ((entry = zend_hash_get_current_data(array)) == NULL) {
      return NULL;
    }

    ZVAL_DEINDIRECT(entry);

    /* Possible with an uninitialized typed property */
    if (UNEXPECTED(Z_TYPE_P(entry) == IS_UNDEF)) {
      zend_result result;
      if (forward_direction) {
        result = zend_hash_move_forward(array);
      } else {
        result = zend_hash_move_backwards(array);
      }
      if (result != SUCCESS) {
        return NULL;
      }
    } else {
      break;
    }
  }

  return entry;
}

static void php_array_iter_return_current(zval *return_value, HashTable *array, bool forward_direction)
{
  zval *entry = php_array_iter_seek_current(array, forward_direction);
  if (EXPECTED(entry)) {
    RETURN_COPY_DEREF(entry);
  } else {
    RETURN_FALSE;
  }
}

/* {{{ Advances array argument's internal pointer to the last element and return it */
PHP_FUNCTION(end)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array_zv, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ true);
  if (zend_hash_num_elements(array) == 0) {
    /* array->nInternalPointer is already 0 if the array is empty, even after removing elements */
    RETURN_FALSE;
  }
  zend_hash_internal_pointer_end(array);

  if (USED_RET()) {
    php_array_iter_return_current(return_value, array, false);
  }
}
/* }}} */

/* {{{ Move array argument's internal pointer to the previous element and return it */
PHP_FUNCTION(prev)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array_zv, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ true);
  if (zend_hash_num_elements(array) == 0) {
    /* array->nInternalPointer is already 0 if the array is empty, even after removing elements */
    RETURN_FALSE;
  }
  zend_hash_move_backwards(array);

  if (USED_RET()) {
    php_array_iter_return_current(return_value, array, false);
  }
}
/* }}} */

/* {{{ Move array argument's internal pointer to the next element and return it */
PHP_FUNCTION(next)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array_zv, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ true);
  if (zend_hash_num_elements(array) == 0) {
    /* array->nInternalPointer is already 0 if the array is empty, even after removing elements */
    RETURN_FALSE;
  }
  zend_hash_move_forward(array);

  if (USED_RET()) {
    php_array_iter_return_current(return_value, array, true);
  }
}
/* }}} */

/* {{{ Set array argument's internal pointer to the first element and return it */
PHP_FUNCTION(reset)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array_zv, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ true);
  if (zend_hash_num_elements(array) == 0) {
    /* array->nInternalPointer is already 0 if the array is empty, even after removing elements */
    RETURN_FALSE;
  }
  zend_hash_internal_pointer_reset(array);

  if (USED_RET()) {
    php_array_iter_return_current(return_value, array, true);
  }
}
/* }}} */

/* {{{ Return the element currently pointed to by the internal array pointer */
PHP_FUNCTION(current)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT(array_zv)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ false);
  php_array_iter_return_current(return_value, array, true);
}
/* }}} */

/* {{{ Return the key of the element currently pointed to by the internal array pointer */
PHP_FUNCTION(key)
{
  zval *array_zv;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_OR_OBJECT(array_zv)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *array = get_ht_for_iap(array_zv, /* separate */ false);
  zval *entry = php_array_iter_seek_current(array, true);
  if (EXPECTED(entry)) {
    zend_hash_get_current_key_zval(array, return_value);
  }
}
/* }}} */

static zval *php_array_data_minmax(HashTable *array, bool max) /* {{{ */
{
  zval *entry, *result = NULL;

  ZEND_HASH_FOREACH_VAL(array, entry) {
    if (!result) {
      result = entry;
      continue;
    }

    int cmp = zend_compare(result, entry);
    if (max ? cmp < 0 : cmp > 0) {
      result = entry;
    }
  } ZEND_HASH_FOREACH_END();

  return result;
}
/* }}} */

/* {{{
 * proto mixed min(array values)
 * proto mixed min(mixed arg1 [, mixed arg2 [, mixed ...]])
   Return the lowest value in an array or a series of arguments */
PHP_FUNCTION(min)
{
  uint32_t argc;
  zval *args = NULL;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  /* mixed min ( array $values ) */
  if (argc == 1) {
    if (Z_TYPE(args[0]) != IS_ARRAY) {
      zend_wrong_parameter_type_error(1, Z_EXPECTED_ARRAY, &args[0]);
      RETURN_THROWS();
    } else {
      zval *result = php_array_data_minmax(Z_ARRVAL(args[0]), false);
      if (result) {
        RETURN_COPY_DEREF(result);
      } else {
        zend_argument_value_error(1, "must contain at least one element");
        RETURN_THROWS();
      }
    }
  } else {
    /* mixed min ( mixed $value1 , mixed $value2 [, mixed $value3... ] ) */
    zval *min;
    uint32_t i;

    min = &args[0];
    zend_long min_lval;
    double min_dval;

    if (Z_TYPE_P(min) == IS_LONG) {
      min_lval = Z_LVAL_P(min);

      for (i = 1; i < argc; i++) {
        if (EXPECTED(Z_TYPE(args[i]) == IS_LONG)) {
          if (min_lval > Z_LVAL(args[i])) {
            min_lval = Z_LVAL(args[i]);
            min = &args[i];
          }
        } else if (Z_TYPE(args[i]) == IS_DOUBLE && (zend_dval_to_lval_silent((double) min_lval) == min_lval)) {
          /* if min_lval can be exactly represented as a double, go to double dedicated code */
          min_dval = (double) min_lval;
          goto double_compare;
        } else {
          goto generic_compare;
        }
      }

      RETURN_LONG(min_lval);
    } else if (Z_TYPE_P(min) == IS_DOUBLE) {
      min_dval = Z_DVAL_P(min);

      for (i = 1; i < argc; i++) {
        if (EXPECTED(Z_TYPE(args[i]) == IS_DOUBLE)) {
          double_compare:
          if (min_dval > Z_DVAL(args[i])) {
            min_dval = Z_DVAL(args[i]);
            min = &args[i];
          }
        } else if (Z_TYPE(args[i]) == IS_LONG && (zend_dval_to_lval_silent((double) Z_LVAL(args[i])) == Z_LVAL(args[i]))) {
          /* if the value can be exactly represented as a double, use double dedicated code otherwise generic */
          if (min_dval > (double)Z_LVAL(args[i])) {
            min_dval = (double)Z_LVAL(args[i]);
            min = &args[i];
          }
        } else {
          goto generic_compare;
        }
      }
    } else {
      for (i = 1; i < argc; i++) {
        generic_compare:
        if (zend_compare(&args[i], min) < 0) {
          min = &args[i];
        }
      }
    }

    RETURN_COPY(min);
  }
}
/* }}} */

ZEND_FRAMELESS_FUNCTION(min, 2)
{
  zval *lhs, *rhs;

  Z_FLF_PARAM_ZVAL(1, lhs);
  Z_FLF_PARAM_ZVAL(2, rhs);

  double lhs_dval;

  if (Z_TYPE_P(lhs) == IS_LONG) {
    zend_long lhs_lval = Z_LVAL_P(lhs);

    if (EXPECTED(Z_TYPE_P(rhs) == IS_LONG)) {
      RETURN_COPY_VALUE(lhs_lval < Z_LVAL_P(rhs) ? lhs : rhs);
    } else if (Z_TYPE_P(rhs) == IS_DOUBLE && (zend_dval_to_lval_silent((double) lhs_lval) == lhs_lval)) {
      /* if lhs_lval can be exactly represented as a double, go to double dedicated code */
      lhs_dval = (double) lhs_lval;
      goto double_compare;
    } else {
      goto generic_compare;
    }
  } else if (Z_TYPE_P(lhs) == IS_DOUBLE) {
    lhs_dval = Z_DVAL_P(lhs);

    if (EXPECTED(Z_TYPE_P(rhs) == IS_DOUBLE)) {
double_compare:
      RETURN_COPY_VALUE(lhs_dval < Z_DVAL_P(rhs) ? lhs : rhs);
    } else if (Z_TYPE_P(rhs) == IS_LONG && (zend_dval_to_lval_silent((double) Z_LVAL_P(rhs)) == Z_LVAL_P(rhs))) {
      /* if the value can be exactly represented as a double, use double dedicated code otherwise generic */
      RETURN_COPY_VALUE(lhs_dval < (double)Z_LVAL_P(rhs) ? lhs : rhs);
    } else {
      goto generic_compare;
    }
  } else {
generic_compare:
    RETURN_COPY(zend_compare(lhs, rhs) < 0 ? lhs : rhs);
  }
}

/* {{{
 * proto mixed max(array values)
 * proto mixed max(mixed arg1 [, mixed arg2 [, mixed ...]])
   Return the highest value in an array or a series of arguments */
PHP_FUNCTION(max)
{
  zval *args = NULL;
  uint32_t argc;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  /* mixed max ( array $values ) */
  if (argc == 1) {
    if (Z_TYPE(args[0]) != IS_ARRAY) {
      zend_wrong_parameter_type_error(1, Z_EXPECTED_ARRAY, &args[0]);
      RETURN_THROWS();
    } else {
      zval *result = php_array_data_minmax(Z_ARRVAL(args[0]), true);
      if (result) {
        RETURN_COPY_DEREF(result);
      } else {
        zend_argument_value_error(1, "must contain at least one element");
        RETURN_THROWS();
      }
    }
  } else {
    /* mixed max ( mixed $value1 , mixed $value2 [, mixed $value3... ] ) */
    zval *max;
    uint32_t i;

    max = &args[0];
    zend_long max_lval;
    double max_dval;

    if (Z_TYPE_P(max) == IS_LONG) {
      max_lval = Z_LVAL_P(max);

      for (i = 1; i < argc; i++) {
        if (EXPECTED(Z_TYPE(args[i]) == IS_LONG)) {
          if (max_lval < Z_LVAL(args[i])) {
            max_lval = Z_LVAL(args[i]);
            max = &args[i];
          }
        } else if (Z_TYPE(args[i]) == IS_DOUBLE && (zend_dval_to_lval_silent((double) max_lval) == max_lval)) {
          /* if max_lval can be exactly represented as a double, go to double dedicated code */
          max_dval = (double) max_lval;
          goto double_compare;
        } else {
          goto generic_compare;
        }
      }

      RETURN_LONG(max_lval);
    } else if (Z_TYPE_P(max) == IS_DOUBLE) {
      max_dval = Z_DVAL_P(max);

      for (i = 1; i < argc; i++) {
        if (EXPECTED(Z_TYPE(args[i]) == IS_DOUBLE)) {
          double_compare:
          if (max_dval < Z_DVAL(args[i])) {
            max_dval = Z_DVAL(args[i]);
            max = &args[i];
          }
        } else if (Z_TYPE(args[i]) == IS_LONG && (zend_dval_to_lval_silent((double) Z_LVAL(args[i])) == Z_LVAL(args[i]))) {
          /* if the value can be exactly represented as a double, use double dedicated code otherwise generic */
          if (max_dval < (double)Z_LVAL(args[i])) {
            max_dval = (double)Z_LVAL(args[i]);
            max = &args[i];
          }
        } else {
          goto generic_compare;
        }
      }
    } else {
      for (i = 1; i < argc; i++) {
        generic_compare:
        if (zend_compare(&args[i], max) > 0) {
          max = &args[i];
        }
      }
    }

    RETURN_COPY(max);
  }
}
/* }}} */

ZEND_FRAMELESS_FUNCTION(max, 2)
{
  zval *lhs, *rhs;

  Z_FLF_PARAM_ZVAL(1, lhs);
  Z_FLF_PARAM_ZVAL(2, rhs);

  double lhs_dval;

  if (Z_TYPE_P(lhs) == IS_LONG) {
    zend_long lhs_lval = Z_LVAL_P(lhs);

    if (EXPECTED(Z_TYPE_P(rhs) == IS_LONG)) {
      RETURN_COPY_VALUE(lhs_lval >= Z_LVAL_P(rhs) ? lhs : rhs);
    } else if (Z_TYPE_P(rhs) == IS_DOUBLE && (zend_dval_to_lval_silent((double) lhs_lval) == lhs_lval)) {
      /* if lhs_lval can be exactly represented as a double, go to double dedicated code */
      lhs_dval = (double) lhs_lval;
      goto double_compare;
    } else {
      goto generic_compare;
    }
  } else if (Z_TYPE_P(lhs) == IS_DOUBLE) {
    lhs_dval = Z_DVAL_P(lhs);

    if (EXPECTED(Z_TYPE_P(rhs) == IS_DOUBLE)) {
double_compare:
      RETURN_COPY_VALUE(lhs_dval >= Z_DVAL_P(rhs) ? lhs : rhs);
    } else if (Z_TYPE_P(rhs) == IS_LONG && (zend_dval_to_lval_silent((double) Z_LVAL_P(rhs)) == Z_LVAL_P(rhs))) {
      /* if the value can be exactly represented as a double, use double dedicated code otherwise generic */
      RETURN_COPY_VALUE(lhs_dval >= (double)Z_LVAL_P(rhs) ? lhs : rhs);
    } else {
      goto generic_compare;
    }
  } else {
generic_compare:
    RETURN_COPY(zend_compare(lhs, rhs) >= 0 ? lhs : rhs);
  }
}

typedef struct {
  zend_fcall_info fci;
  zend_fcall_info_cache fci_cache;
} php_array_walk_context;

static zend_result php_array_walk(
  php_array_walk_context *context, zval *array, zval *userdata, bool recursive)
{
  zval args[3],   /* Arguments to userland function */
     retval,    /* Return value - unused */
     *zv;
  HashTable *target_hash = HASH_OF(array);
  HashPosition pos;
  uint32_t ht_iter;
  zend_result result = SUCCESS;

  /* Create a local copy of fci, as we want to use different arguments at different
   * levels of recursion. */
  zend_fcall_info fci = context->fci;

#ifdef ZEND_CHECK_STACK_LIMIT
  if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
    zend_call_stack_size_error();
    return FAILURE;
  }
#endif

  if (zend_hash_num_elements(target_hash) == 0) {
    return result;
  }

  /* Set up known arguments */
  ZVAL_UNDEF(&args[1]);
  if (userdata) {
    ZVAL_COPY_VALUE(&args[2], userdata);
  }

  fci.retval = &retval;
  fci.param_count = userdata ? 3 : 2;
  fci.params = args;

  zend_hash_internal_pointer_reset_ex(target_hash, &pos);
  ht_iter = zend_hash_iterator_add(target_hash, pos);

  /* Iterate through hash */
  do {
    /* Retrieve value */
    zv = zend_hash_get_current_data_ex(target_hash, &pos);
    if (zv == NULL) {
      break;
    }

    /* Skip undefined indirect elements */
    if (Z_TYPE_P(zv) == IS_INDIRECT) {
      zv = Z_INDIRECT_P(zv);
      if (Z_TYPE_P(zv) == IS_UNDEF) {
        zend_hash_move_forward_ex(target_hash, &pos);
        continue;
      }

      /* Add type source for property references. */
      if (Z_TYPE_P(zv) != IS_REFERENCE && Z_TYPE_P(array) == IS_OBJECT) {
        zend_property_info *prop_info =
          zend_get_typed_property_info_for_slot(Z_OBJ_P(array), zv);
        if (prop_info) {
          ZVAL_NEW_REF(zv, zv);
          ZEND_REF_ADD_TYPE_SOURCE(Z_REF_P(zv), prop_info);
        }
      }
    }

    /* Ensure the value is a reference. Otherwise the location of the value may be freed. */
    ZVAL_MAKE_REF(zv);

    /* Retrieve key */
    zend_hash_get_current_key_zval_ex(target_hash, &args[1], &pos);

    /* Move to next element already now -- this mirrors the approach used by foreach
     * and ensures proper behavior with regard to modifications. */
    zend_hash_move_forward_ex(target_hash, &pos);

    /* Back up hash position, as it may change */
    EG(ht_iterators)[ht_iter].pos = pos;

    if (recursive && Z_TYPE_P(Z_REFVAL_P(zv)) == IS_ARRAY) {
      HashTable *thash;
      zval ref;
      ZVAL_COPY_VALUE(&ref, zv);

      ZVAL_DEREF(zv);
      SEPARATE_ARRAY(zv);
      thash = Z_ARRVAL_P(zv);
      if (GC_IS_RECURSIVE(thash)) {
        zend_throw_error(NULL, "Recursion detected");
        result = FAILURE;
        break;
      }

      Z_ADDREF(ref);
      GC_PROTECT_RECURSION(thash);
      result = php_array_walk(context, zv, userdata, recursive);
      if (Z_TYPE_P(Z_REFVAL(ref)) == IS_ARRAY && thash == Z_ARRVAL_P(Z_REFVAL(ref))) {
        /* If the hashtable changed in the meantime, we'll "leak" this apply count
         * increment -- our reference to thash is no longer valid. */
        GC_UNPROTECT_RECURSION(thash);
      }
      zval_ptr_dtor(&ref);
    } else {
      ZVAL_COPY_VALUE(&args[0], zv);

      /* Call the userland function */
      result = zend_call_function(&fci, &context->fci_cache);
      zval_ptr_dtor(&retval);
    }

    zval_ptr_dtor_str(&args[1]);

    if (result == FAILURE) {
      break;
    }

    /* Reload array and position -- both may have changed */
    if (Z_TYPE_P(array) == IS_ARRAY) {
      pos = zend_hash_iterator_pos_ex(ht_iter, array);
      target_hash = Z_ARRVAL_P(array);
    } else if (Z_TYPE_P(array) == IS_OBJECT) {
      target_hash = Z_OBJPROP_P(array);
      pos = zend_hash_iterator_pos(ht_iter, target_hash);
    } else {
      zend_type_error("Iterated value is no longer an array or object");
      result = FAILURE;
      break;
    }
  } while (!EG(exception));

  zend_hash_iterator_del(ht_iter);
  return result;
}

/* {{{ Apply a user function to every member of an array */
PHP_FUNCTION(array_walk)
{
  zval *array;
  zval *userdata = NULL;
  php_array_walk_context context;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array, 0, 1)
    Z_PARAM_FUNC(context.fci, context.fci_cache)
    Z_PARAM_OPTIONAL
    Z_PARAM_ZVAL(userdata)
  ZEND_PARSE_PARAMETERS_END();

  if (Z_TYPE_P(array) == IS_OBJECT) {
    php_error_docref(NULL, E_DEPRECATED,
      "Passing an object for argument #1 $array to array_walk() is deprecated, call get_object_vars() first instead");
    if (UNEXPECTED(EG(exception))) {
      RETURN_THROWS();
    }
  }

  php_array_walk(&context, array, userdata, /* recursive */ false);
  RETURN_TRUE;
}
/* }}} */

/* {{{ Apply a user function recursively to every member of an array */
PHP_FUNCTION(array_walk_recursive)
{
  zval *array;
  zval *userdata = NULL;
  php_array_walk_context context;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ARRAY_OR_OBJECT_EX(array, 0, 1)
    Z_PARAM_FUNC(context.fci, context.fci_cache)
    Z_PARAM_OPTIONAL
    Z_PARAM_ZVAL(userdata)
  ZEND_PARSE_PARAMETERS_END();


  if (Z_TYPE_P(array) == IS_OBJECT) {
    php_error_docref(NULL, E_DEPRECATED,
      "Passing an object for argument #1 $array to array_walk_recursive() is deprecated, call get_object_vars() first instead");
    if (UNEXPECTED(EG(exception))) {
      RETURN_THROWS();
    }
  }

  php_array_walk(&context, array, userdata, /* recursive */ true);
  RETURN_TRUE;
}
/* }}} */

/* void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior)
 * 0 = return boolean
 * 1 = return key
 */
static zend_always_inline void _php_search_array(zval *return_value, zval *value, zval *array, bool strict, int behavior) /* {{{ */
{
  zval *entry; /* pointer to array entry */
  zend_ulong num_idx;
  zend_string *str_idx;

  if (strict) {
    if (Z_TYPE_P(value) == IS_LONG) {
      ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
        ZVAL_DEREF(entry);
        if (Z_TYPE_P(entry) == IS_LONG && Z_LVAL_P(entry) == Z_LVAL_P(value)) {
          if (behavior == 0) {
            RETURN_TRUE;
          } else {
            if (str_idx) {
              RETURN_STR_COPY(str_idx);
            } else {
              RETURN_LONG(num_idx);
            }
          }
        }
      } ZEND_HASH_FOREACH_END();
    } else {
      ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
        ZVAL_DEREF(entry);
        if (fast_is_identical_function(value, entry)) {
          if (behavior == 0) {
            RETURN_TRUE;
          } else {
            if (str_idx) {
              RETURN_STR_COPY(str_idx);
            } else {
              RETURN_LONG(num_idx);
            }
          }
        }
      } ZEND_HASH_FOREACH_END();
    }
  } else {
    if (Z_TYPE_P(value) == IS_LONG) {
      ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
        if (fast_equal_check_long(value, entry)) {
          if (behavior == 0) {
            RETURN_TRUE;
          } else {
            if (str_idx) {
              RETURN_STR_COPY(str_idx);
            } else {
              RETURN_LONG(num_idx);
            }
          }
        }
      } ZEND_HASH_FOREACH_END();
    } else if (Z_TYPE_P(value) == IS_STRING) {
      ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
        if (fast_equal_check_string(value, entry)) {
          if (behavior == 0) {
            RETURN_TRUE;
          } else {
            if (str_idx) {
              RETURN_STR_COPY(str_idx);
            } else {
              RETURN_LONG(num_idx);
            }
          }
        }
      } ZEND_HASH_FOREACH_END();
    } else {
      ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
        if (fast_equal_check_function(value, entry)) {
          if (behavior == 0) {
            RETURN_TRUE;
          } else {
            if (str_idx) {
              RETURN_STR_COPY(str_idx);
            } else {
              RETURN_LONG(num_idx);
            }
          }
        }
      } ZEND_HASH_FOREACH_END();
    }
  }

  RETURN_FALSE;
}
/* }}} */

/* void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior)
 * 0 = return boolean
 * 1 = return key
 */
static inline void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior)
{
  zval *value,    /* value to check for */
     *array;    /* array to check in */
  bool strict = 0;  /* strict comparison or not */

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ZVAL(value)
    Z_PARAM_ARRAY(array)
    Z_PARAM_OPTIONAL
    Z_PARAM_BOOL(strict)
  ZEND_PARSE_PARAMETERS_END();

  _php_search_array(return_value, value, array, strict, behavior);
}

/* {{{ Checks if the given value exists in the array */
PHP_FUNCTION(in_array)
{
  php_search_array(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

ZEND_FRAMELESS_FUNCTION(in_array, 2)
{
  zval *value, *array;

  Z_FLF_PARAM_ZVAL(1, value);
  Z_FLF_PARAM_ARRAY(2, array);

  _php_search_array(return_value, value, array, false, 0);

flf_clean:;
}

ZEND_FRAMELESS_FUNCTION(in_array, 3)
{
  zval *value, *array;
  bool strict;

  Z_FLF_PARAM_ZVAL(1, value);
  Z_FLF_PARAM_ARRAY(2, array);
  Z_FLF_PARAM_BOOL(3, strict);

  _php_search_array(return_value, value, array, strict, 0);

flf_clean:;
}

/* {{{ Searches the array for a given value and returns the corresponding key if successful */
PHP_FUNCTION(array_search)
{
  php_search_array(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

static zend_always_inline bool php_valid_var_name(const zend_string *var_name) /* {{{ */
{
  /* first 256 bits for first character, and second 256 bits for the next */
  static const uint32_t charset[8] = {
       /*  31      0   63     32   95     64   127    96 */
      0x00000000, 0x00000000, 0x87fffffe, 0x07fffffe,
      0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff};
  static const uint32_t charset2[8] = {
       /*  31      0   63     32   95     64   127    96 */
      0x00000000, 0x03ff0000, 0x87fffffe, 0x07fffffe,
      0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff};

  if (UNEXPECTED(!ZSTR_LEN(var_name))) {
    return false;
  }

  /* These are allowed as first char: [a-zA-Z_\x7f-\xff] */
  uint32_t ch = (uint32_t)((unsigned char *)ZSTR_VAL(var_name))[0];
  if (UNEXPECTED(!ZEND_BIT_TEST(charset, ch))) {
    return false;
  }

  /* And these as the rest: [a-zA-Z0-9_\x7f-\xff] */
  if (ZSTR_LEN(var_name) > 1) {
    size_t i = 1;
    do {
      ch = (uint32_t)((unsigned char *)ZSTR_VAL(var_name))[i];
      if (UNEXPECTED(!ZEND_BIT_TEST(charset2, ch))) {
        return false;
      }
    } while (++i < ZSTR_LEN(var_name));
  }
  return true;
}
/* }}} */

static zend_string* php_prefix_varname(const zend_string *prefix, const zend_string *var_name)
{
  return zend_string_concat3(ZSTR_VAL(prefix), ZSTR_LEN(prefix), ZEND_STRL("_"), ZSTR_VAL(var_name), ZSTR_LEN(var_name));
}

static zend_long php_extract_ref_if_exists(const zend_array *arr, const zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          continue;
        }
      }
      if (!php_valid_var_name(var_name)) {
        continue;
      }
      if (zend_string_equals_literal(var_name, "GLOBALS")) {
        continue;
      }
      if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        zend_throw_error(NULL, "Cannot re-assign $this");
        return -1;
      }
      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      zval_ptr_dtor(orig_var);
      ZVAL_REF(orig_var, Z_REF_P(entry));
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_if_exists(const zend_array *arr, const zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          continue;
        }
      }
      if (!php_valid_var_name(var_name)) {
        continue;
      }
      if (zend_string_equals_literal(var_name, "GLOBALS")) {
        continue;
      }
      if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        zend_throw_error(NULL, "Cannot re-assign $this");
        return -1;
      }
      ZVAL_DEREF(entry);
      ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
      if (UNEXPECTED(EG(exception))) {
        return -1;
      }
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_overwrite(const zend_array *arr, zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (!php_valid_var_name(var_name)) {
      continue;
    }
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
      zend_throw_error(NULL, "Cannot re-assign $this");
      return -1;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
      }
      if (zend_string_equals_literal(var_name, "GLOBALS")) {
        continue;
      }
      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      zval garbage;
      ZVAL_COPY_VALUE(&garbage, orig_var);
      ZVAL_REF(orig_var, Z_REF_P(entry));
      zval_ptr_dtor(&garbage);
    } else {
      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      zend_hash_add_new(symbol_table, var_name, entry);
    }
    count++;
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_overwrite(const zend_array *arr, zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (!php_valid_var_name(var_name)) {
      continue;
    }
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
      zend_throw_error(NULL, "Cannot re-assign $this");
      return -1;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
      }
      if (zend_string_equals_literal(var_name, "GLOBALS")) {
        continue;
      }
      ZVAL_DEREF(entry);
      ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
      if (UNEXPECTED(EG(exception))) {
        return -1;
      }
    } else {
      ZVAL_DEREF(entry);
      Z_TRY_ADDREF_P(entry);
      zend_hash_add_new(symbol_table, var_name, entry);
    }
    count++;
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_prefix_if_exists(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          if (Z_ISREF_P(entry)) {
            Z_ADDREF_P(entry);
          } else {
            ZVAL_MAKE_REF_EX(entry, 2);
          }
          ZVAL_REF(orig_var, Z_REF_P(entry));
          count++;
          continue;
        }
      }
      zend_string *final_name = php_prefix_varname(prefix, var_name);
      if (php_valid_var_name(final_name)) {
        /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
        ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

        if (Z_ISREF_P(entry)) {
          Z_ADDREF_P(entry);
        } else {
          ZVAL_MAKE_REF_EX(entry, 2);
        }
        if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
          if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
            orig_var = Z_INDIRECT_P(orig_var);
          }
          zval_ptr_dtor(orig_var);
          ZVAL_REF(orig_var, Z_REF_P(entry));
        } else {
          zend_hash_add_new(symbol_table, final_name, entry);
        }
        count++;
      }
      zend_string_release_ex(final_name, false);
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_prefix_if_exists(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          ZVAL_COPY_DEREF(orig_var, entry);
          count++;
          continue;
        }
      }
      zend_string *final_name = php_prefix_varname(prefix, var_name);
      if (php_valid_var_name(final_name)) {
        /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
        ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

        ZVAL_DEREF(entry);
        if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
          if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
            orig_var = Z_INDIRECT_P(orig_var);
          }
          ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
          if (UNEXPECTED(EG(exception))) {
            zend_string_release_ex(final_name, 0);
            return -1;
          }
        } else {
          Z_TRY_ADDREF_P(entry);
          zend_hash_add_new(symbol_table, final_name, entry);
        }
        count++;
      }
      zend_string_release_ex(final_name, false);
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_prefix_same(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (ZSTR_LEN(var_name) == 0) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          if (Z_ISREF_P(entry)) {
            Z_ADDREF_P(entry);
          } else {
            ZVAL_MAKE_REF_EX(entry, 2);
          }
          ZVAL_REF(orig_var, Z_REF_P(entry));
          count++;
          continue;
        }
      }
prefix:;
      zend_string *final_name = php_prefix_varname(prefix, var_name);
      if (php_valid_var_name(final_name)) {
        /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
        ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

        if (Z_ISREF_P(entry)) {
          Z_ADDREF_P(entry);
        } else {
          ZVAL_MAKE_REF_EX(entry, 2);
        }
        if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
          if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
            orig_var = Z_INDIRECT_P(orig_var);
          }
          zval_ptr_dtor(orig_var);
          ZVAL_REF(orig_var, Z_REF_P(entry));
        } else {
          zend_hash_add_new(symbol_table, final_name, entry);
        }
        count++;
      }
      zend_string_release_ex(final_name, false);
    } else {
      if (!php_valid_var_name(var_name)) {
        continue;
      }
      if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        goto prefix;
      }
      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      zend_hash_add_new(symbol_table, var_name, entry);
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_prefix_same(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (ZSTR_LEN(var_name) == 0) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          ZVAL_COPY_DEREF(orig_var, entry);
          count++;
          continue;
        }
      }
prefix:;
      zend_string *final_name = php_prefix_varname(prefix, var_name);
      if (php_valid_var_name(final_name)) {
        /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
        ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

        ZVAL_DEREF(entry);
        if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
          if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
            orig_var = Z_INDIRECT_P(orig_var);
          }
          ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
          if (UNEXPECTED(EG(exception))) {
            zend_string_release_ex(final_name, false);
            return -1;
          }
        } else {
          Z_TRY_ADDREF_P(entry);
          zend_hash_add_new(symbol_table, final_name, entry);
        }
        count++;
      }
      zend_string_release_ex(final_name, false);
    } else {
      if (!php_valid_var_name(var_name)) {
        continue;
      }
      if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        goto prefix;
      }
      ZVAL_DEREF(entry);
      Z_TRY_ADDREF_P(entry);
      zend_hash_add_new(symbol_table, var_name, entry);
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_prefix_all(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zend_ulong num_key;
  zval *entry, *orig_var;

  ZEND_HASH_FOREACH_KEY_VAL(arr, num_key, var_name, entry) {
    zend_string *final_name;
    if (var_name) {
      if (ZSTR_LEN(var_name) == 0) {
        continue;
      }
      final_name = php_prefix_varname(prefix, var_name);
    } else {
      zend_string *str = zend_long_to_str(num_key);
      final_name = php_prefix_varname(prefix, str);
      zend_string_release_ex(str, false);
    }
    if (php_valid_var_name(final_name)) {
      /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
      ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
        if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
          orig_var = Z_INDIRECT_P(orig_var);
        }
        zval_ptr_dtor(orig_var);
        ZVAL_REF(orig_var, Z_REF_P(entry));
      } else {
        zend_hash_add_new(symbol_table, final_name, entry);
      }
      count++;
    }
    zend_string_release_ex(final_name, false);
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_prefix_all(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zend_ulong num_key;
  zval *entry, *orig_var;

  ZEND_HASH_FOREACH_KEY_VAL(arr, num_key, var_name, entry) {
    zend_string *final_name;
    if (var_name) {
      if (ZSTR_LEN(var_name) == 0) {
        continue;
      }
      final_name = php_prefix_varname(prefix, var_name);
    } else {
      zend_string *str = zend_long_to_str(num_key);
      final_name = php_prefix_varname(prefix, str);
      zend_string_release_ex(str, false);
    }
    if (php_valid_var_name(final_name)) {
      /* Prefixed varname cannot be equal to "this" due to underscore between prefix and name */
      ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

      ZVAL_DEREF(entry);
      if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
        if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
          orig_var = Z_INDIRECT_P(orig_var);
        }
        ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
        if (UNEXPECTED(EG(exception))) {
          zend_string_release_ex(final_name, false);
          return -1;
        }
      } else {
        Z_TRY_ADDREF_P(entry);
        zend_hash_add_new(symbol_table, final_name, entry);
      }
      count++;
    }
    zend_string_release_ex(final_name, false);
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_prefix_invalid(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zend_ulong num_key;
  zval *entry, *orig_var;

  ZEND_HASH_FOREACH_KEY_VAL(arr, num_key, var_name, entry) {
    zend_string *final_name;
    if (var_name) {
      if (!php_valid_var_name(var_name) || zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        final_name = php_prefix_varname(prefix, var_name);

        if (!php_valid_var_name(final_name)) {
          zend_string_release_ex(final_name, false);
          continue;
        }
      } else {
        final_name = zend_string_copy(var_name);
      }
    } else {
      zend_string *str = zend_long_to_str(num_key);
      final_name = php_prefix_varname(prefix, str);
      zend_string_release_ex(str, false);
      if (!php_valid_var_name(final_name)) {
        zend_string_release_ex(final_name, false);
        continue;
      }
    }

    /* We previously checked if the var name is "this" to prefix it */
    ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

    if (Z_ISREF_P(entry)) {
      Z_ADDREF_P(entry);
    } else {
      ZVAL_MAKE_REF_EX(entry, 2);
    }
    if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
      }
      zval_ptr_dtor(orig_var);
      ZVAL_REF(orig_var, Z_REF_P(entry));
    } else {
      zend_hash_add_new(symbol_table, final_name, entry);
    }
    count++;

    zend_string_release_ex(final_name, false);
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_prefix_invalid(const zend_array *arr, zend_array *symbol_table, const zend_string *prefix) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zend_ulong num_key;
  zval *entry, *orig_var;

  ZEND_HASH_FOREACH_KEY_VAL(arr, num_key, var_name, entry) {
    zend_string *final_name;
    if (var_name) {
      if (!php_valid_var_name(var_name) || zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        final_name = php_prefix_varname(prefix, var_name);
        if (!php_valid_var_name(final_name)) {
          zend_string_release_ex(final_name, false);
          continue;
        }
      } else {
        final_name = zend_string_copy(var_name);
      }
    } else {
      zend_string *str = zend_long_to_str(num_key);
      final_name = php_prefix_varname(prefix, str);
      zend_string_release_ex(str, 0);
      if (!php_valid_var_name(final_name)) {
        zend_string_release_ex(final_name, false);
        continue;
      }
    }

    /* We previously checked if the var name is "this" to prefix it */
    ZEND_ASSERT(!zend_string_equals(final_name, ZSTR_KNOWN(ZEND_STR_THIS)));

    ZVAL_DEREF(entry);
    if ((orig_var = zend_hash_find(symbol_table, final_name)) != NULL) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
      }
      ZEND_TRY_ASSIGN_COPY_EX(orig_var, entry, 0);
      if (UNEXPECTED(EG(exception))) {
        zend_string_release_ex(final_name, false);
        return -1;
      }
    } else {
      Z_TRY_ADDREF_P(entry);
      zend_hash_add_new(symbol_table, final_name, entry);
    }
    count++;

    zend_string_release_ex(final_name, false);
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_ref_skip(const zend_array *arr, zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (!php_valid_var_name(var_name)) {
      continue;
    }
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          if (Z_ISREF_P(entry)) {
            Z_ADDREF_P(entry);
          } else {
            ZVAL_MAKE_REF_EX(entry, 2);
          }
          ZVAL_REF(orig_var, Z_REF_P(entry));
          count++;
        }
      }
    } else {
      if (Z_ISREF_P(entry)) {
        Z_ADDREF_P(entry);
      } else {
        ZVAL_MAKE_REF_EX(entry, 2);
      }
      zend_hash_add_new(symbol_table, var_name, entry);
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

static zend_long php_extract_skip(const zend_array *arr, zend_array *symbol_table) /* {{{ */
{
  zend_long count = 0;
  zend_string *var_name;
  zval *entry, *orig_var;

  if (HT_IS_PACKED(arr)) {
    return 0;
  }
  ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(arr, var_name, entry) {
    if (!var_name) {
      continue;
    }
    if (!php_valid_var_name(var_name)) {
      continue;
    }
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
      continue;
    }
    orig_var = zend_hash_find_known_hash(symbol_table, var_name);
    if (orig_var) {
      if (Z_TYPE_P(orig_var) == IS_INDIRECT) {
        orig_var = Z_INDIRECT_P(orig_var);
        if (Z_TYPE_P(orig_var) == IS_UNDEF) {
          ZVAL_COPY_DEREF(orig_var, entry);
          count++;
        }
      }
    } else {
      ZVAL_DEREF(entry);
      Z_TRY_ADDREF_P(entry);
      zend_hash_add_new(symbol_table, var_name, entry);
      count++;
    }
  } ZEND_HASH_FOREACH_END();

  return count;
}
/* }}} */

/* {{{ Imports variables into symbol table from an array */
PHP_FUNCTION(extract)
{
  zval *var_array_param;
  zend_long extract_refs;
  zend_long extract_type = PHP_EXTR_OVERWRITE;
  zend_string *prefix = NULL;
  zend_long count;
  zend_array *symbol_table;

  ZEND_PARSE_PARAMETERS_START(1, 3)
    Z_PARAM_ARRAY_EX2(var_array_param, 0, 1, 0)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(extract_type)
    Z_PARAM_STR(prefix)
  ZEND_PARSE_PARAMETERS_END();

  extract_refs = (extract_type & PHP_EXTR_REFS);
  if (extract_refs) {
    SEPARATE_ARRAY(var_array_param);
  }
  extract_type &= 0xff;

  if (extract_type < PHP_EXTR_OVERWRITE || extract_type > PHP_EXTR_IF_EXISTS) {
    zend_argument_value_error(2, "must be a valid extract type");
    RETURN_THROWS();
  }

  if (extract_type > PHP_EXTR_SKIP && extract_type <= PHP_EXTR_PREFIX_IF_EXISTS && ZEND_NUM_ARGS() < 3) {
    zend_argument_value_error(3, "is required when using this extract type");
    RETURN_THROWS();
  }

  if (prefix) {
    if (ZSTR_LEN(prefix) && !php_valid_var_name(prefix)) {
      zend_argument_value_error(3, "must be a valid identifier");
      RETURN_THROWS();
    }
  }

  if (zend_forbid_dynamic_call() == FAILURE) {
    return;
  }

  symbol_table = zend_rebuild_symbol_table();
  ZEND_ASSERT(symbol_table && "A symbol table should always be available here");

  if (extract_refs) {
    switch (extract_type) {
      case PHP_EXTR_IF_EXISTS:
        count = php_extract_ref_if_exists(Z_ARRVAL_P(var_array_param), symbol_table);
        break;
      case PHP_EXTR_OVERWRITE:
        count = php_extract_ref_overwrite(Z_ARRVAL_P(var_array_param), symbol_table);
        break;
      case PHP_EXTR_PREFIX_IF_EXISTS:
        count = php_extract_ref_prefix_if_exists(Z_ARRVAL_P(var_array_param), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_SAME:
        count = php_extract_ref_prefix_same(Z_ARRVAL_P(var_array_param), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_ALL:
        count = php_extract_ref_prefix_all(Z_ARRVAL_P(var_array_param), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_INVALID:
        count = php_extract_ref_prefix_invalid(Z_ARRVAL_P(var_array_param), symbol_table, prefix);
        break;
      default:
        count = php_extract_ref_skip(Z_ARRVAL_P(var_array_param), symbol_table);
        break;
    }
  } else {
    /* The array might be stored in a local variable that will be overwritten */
    zval array_copy;
    ZVAL_COPY(&array_copy, var_array_param);
    switch (extract_type) {
      case PHP_EXTR_IF_EXISTS:
        count = php_extract_if_exists(Z_ARRVAL(array_copy), symbol_table);
        break;
      case PHP_EXTR_OVERWRITE:
        count = php_extract_overwrite(Z_ARRVAL(array_copy), symbol_table);
        break;
      case PHP_EXTR_PREFIX_IF_EXISTS:
        count = php_extract_prefix_if_exists(Z_ARRVAL(array_copy), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_SAME:
        count = php_extract_prefix_same(Z_ARRVAL(array_copy), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_ALL:
        count = php_extract_prefix_all(Z_ARRVAL(array_copy), symbol_table, prefix);
        break;
      case PHP_EXTR_PREFIX_INVALID:
        count = php_extract_prefix_invalid(Z_ARRVAL(array_copy), symbol_table, prefix);
        break;
      default:
        count = php_extract_skip(Z_ARRVAL(array_copy), symbol_table);
        break;
    }
    zval_ptr_dtor(&array_copy);
  }

  RETURN_LONG(count);
}
/* }}} */

static zend_result php_compact_var(HashTable *eg_active_symbol_table, zval *return_value, zval *entry, uint32_t pos) /* {{{ */
{
  zval *value_ptr, data;

  ZVAL_DEREF(entry);
  if (Z_TYPE_P(entry) == IS_STRING) {
    if ((value_ptr = zend_hash_find_ind(eg_active_symbol_table, Z_STR_P(entry))) != NULL) {
      ZVAL_DEREF(value_ptr);
      Z_TRY_ADDREF_P(value_ptr);
      zend_hash_update(Z_ARRVAL_P(return_value), Z_STR_P(entry), value_ptr);
    } else if (zend_string_equals(Z_STR_P(entry), ZSTR_KNOWN(ZEND_STR_THIS))) {
      zend_object *object = zend_get_this_object(EG(current_execute_data));
      if (object) {
        ZVAL_OBJ_COPY(&data, object);
        zend_hash_update(Z_ARRVAL_P(return_value), Z_STR_P(entry), &data);
      }
    } else {
      php_error_docref(NULL, E_WARNING, "Undefined variable $%pS", Z_STR_P(entry));
      /* A user error handler may have thrown. */
      return EG(exception) ? FAILURE : SUCCESS;
    }
  } else if (Z_TYPE_P(entry) == IS_ARRAY) {
    zend_result result = SUCCESS;

#ifdef ZEND_CHECK_STACK_LIMIT
    if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
      zend_call_stack_size_error();
      return FAILURE;
    }
#endif
    if (Z_REFCOUNTED_P(entry)) {
      if (Z_IS_RECURSIVE_P(entry)) {
        zend_throw_error(NULL, "Recursion detected");
        return FAILURE;
      }
      Z_PROTECT_RECURSION_P(entry);
    }
    ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(entry), value_ptr) {
      if (UNEXPECTED(php_compact_var(eg_active_symbol_table, return_value, value_ptr, pos) == FAILURE)) {
        result = FAILURE;
        break;
      }
    } ZEND_HASH_FOREACH_END();
    if (Z_REFCOUNTED_P(entry)) {
      Z_UNPROTECT_RECURSION_P(entry);
    }

    return result;
  } else {
    php_error_docref(NULL, E_WARNING, "Argument #%d must be string or array of strings, %s given", pos, zend_zval_value_name(entry));
    /* A user error handler may have thrown. */
    return EG(exception) ? FAILURE : SUCCESS;
  }

  return SUCCESS;
}
/* }}} */

/* {{{ Creates a hash containing variables and their values */
PHP_FUNCTION(compact)
{
  zval *args = NULL; /* function arguments array */
  uint32_t num_args, i;
  zend_array *symbol_table;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, num_args)
  ZEND_PARSE_PARAMETERS_END();

  if (zend_forbid_dynamic_call() == FAILURE) {
    return;
  }

  symbol_table = zend_rebuild_symbol_table();
  ZEND_ASSERT(symbol_table && "A symbol table should always be available here");

  /* compact() is probably most used with a single array of var_names
     or multiple string names, rather than a combination of both.
     So quickly guess a minimum result size based on that */
  if (num_args && Z_TYPE(args[0]) == IS_ARRAY) {
    array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL(args[0])));
  } else {
    array_init_size(return_value, num_args);
  }

  for (i = 0; i < num_args; i++) {
    if (UNEXPECTED(php_compact_var(symbol_table, return_value, &args[i], i + 1) == FAILURE)) {
      RETURN_THROWS();
    }
  }
}
/* }}} */

/* {{{ Create an array containing num elements starting with index start_key each initialized to val */
PHP_FUNCTION(array_fill)
{
  zval *val;
  zend_long start_key, num;

  ZEND_PARSE_PARAMETERS_START(3, 3)
    Z_PARAM_LONG(start_key)
    Z_PARAM_LONG(num)
    Z_PARAM_ZVAL(val)
  ZEND_PARSE_PARAMETERS_END();

  if (EXPECTED(num > 0)) {
    if (sizeof(num) > 4 && UNEXPECTED(num > INT_MAX)) {
      zend_argument_value_error(2, "is too large");
      RETURN_THROWS();
    } else if (UNEXPECTED(start_key > ZEND_LONG_MAX - num + 1)) {
      zend_throw_error(NULL, "Cannot add element to the array as the next element is already occupied");
      RETURN_THROWS();
    } else if (EXPECTED(start_key >= 0) && EXPECTED(start_key < num)) {
      /* create packed array */
      zval *zv;

      if (UNEXPECTED(!array_finit_size_packed(return_value, (uint32_t)(start_key + num)))) {
        RETURN_OOM();
      }
      Z_ARRVAL_P(return_value)->nNumUsed = (uint32_t)(start_key + num);
      Z_ARRVAL_P(return_value)->nNumOfElements = (uint32_t)num;
      Z_ARRVAL_P(return_value)->nNextFreeElement = (zend_long)(start_key + num);

      if (Z_REFCOUNTED_P(val)) {
        GC_ADDREF_EX(Z_COUNTED_P(val), (uint32_t)num);
      }

      zv = Z_ARRVAL_P(return_value)->arPacked;

      while (start_key--) {
        ZVAL_UNDEF(zv);
        zv++;
      }
      while (num--) {
        ZVAL_COPY_VALUE(zv, val);
        zv++;
      }
    } else {
      /* create hash */
      if (UNEXPECTED(!array_finit_size_mixed(return_value, (uint32_t)num))) {
        RETURN_OOM();
      }
      if (Z_REFCOUNTED_P(val)) {
        GC_ADDREF_EX(Z_COUNTED_P(val), (uint32_t)num);
      }
      zend_hash_index_add_new(Z_ARRVAL_P(return_value), start_key, val);
      while (--num) {
        zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), val);
        start_key++;
      }
    }
  } else if (EXPECTED(num == 0)) {
    RETURN_EMPTY_ARRAY();
  } else {
    zend_argument_value_error(2, "must be greater than or equal to 0");
    RETURN_THROWS();
  }
}
/* }}} */

/* {{{ Create an array using the elements of the first parameter as keys each initialized to val */
PHP_FUNCTION(array_fill_keys)
{
  zval *keys, *val, *entry;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY(keys)
    Z_PARAM_ZVAL(val)
  ZEND_PARSE_PARAMETERS_END();

  /* Initialize return array */
  array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(keys)));

  ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(keys), entry) {
    ZVAL_DEREF(entry);
    if (Z_TYPE_P(entry) == IS_LONG) {
      zend_hash_index_add(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), val);
    } else {
      zend_string *tmp_key;
      zend_string *key = zval_get_tmp_string(entry, &tmp_key);
      zend_symtable_add(Z_ARRVAL_P(return_value), key, val);
      zend_tmp_string_release(tmp_key);
    }
  } ZEND_HASH_FOREACH_END();

  if (Z_REFCOUNTED_P(val)) {
    GC_ADDREF_EX(Z_COUNTED_P(val), zend_hash_num_elements(Z_ARRVAL_P(return_value)));
  }
}
/* }}} */

#define RANGE_CHECK_DOUBLE_INIT_ARRAY(start, end, _step) do { \
    double __calc_size = ((start - end) / (_step)) + 1; \
    if (__calc_size >= (double)HT_MAX_SIZE) { \
      double __exceed_by = __calc_size - (double)HT_MAX_SIZE; \
      zend_value_error(\
        "The supplied range exceeds the maximum array size by %.1f elements: " \
        "start=%.1f, end=%.1f, step=%.1f. Max size: %.0f", \
        __exceed_by, end, start, (_step), (double)HT_MAX_SIZE); \
      RETURN_THROWS(); \
    } \
    size = (uint32_t)_php_math_round(__calc_size, 0, PHP_ROUND_HALF_UP); \
    array_init_size(return_value, size); \
    if (UNEXPECTED(zend_hash_real_finit_packed(Z_ARRVAL_P(return_value), /* fallible */ true) == FAILURE)) { \
      RETURN_OOM(); \
    } \
  } while (0)

#define RANGE_CHECK_LONG_INIT_ARRAY(start, end, _step) do { \
    zend_ulong __calc_size = ((zend_ulong) start - end) / (_step); \
    if (__calc_size >= HT_MAX_SIZE - 1) { \
      uint64_t __excess = __calc_size - (HT_MAX_SIZE - 1); \
      zend_value_error(\
        "The supplied range exceeds the maximum array size by %" PRIu64 " elements: " \
        "start=" ZEND_LONG_FMT ", end=" ZEND_LONG_FMT ", step=" ZEND_LONG_FMT ". " \
        "Calculated size: %" PRIu64 ". Maximum size: %" PRIu64 ".", \
        __excess, end, start, (_step), (uint64_t)__calc_size, (uint64_t)HT_MAX_SIZE); \
      RETURN_THROWS(); \
    } \
    size = (uint32_t)(__calc_size + 1); \
    array_init_size(return_value, size); \
    if (UNEXPECTED(zend_hash_real_finit_packed(Z_ARRVAL_P(return_value), /* fallible */ true) == FAILURE)) { \
      RETURN_OOM(); \
    } \
  } while (0)

/* Process input for the range() function
 * 0 on exceptions
 * IS_LONG if only interpretable as int
 * IS_DOUBLE if only interpretable as float
 * IS_STRING if only interpretable as string
 * IS_ARRAY (as IS_LONG < IS_STRING < IS_ARRAY) for ambiguity of single byte strings which contains a digit */
static uint8_t php_range_process_input(const zval *input, uint32_t arg_num, zend_long /* restrict */ *lval, double /* restrict */ *dval)
{
  switch (Z_TYPE_P(input)) {
    case IS_LONG:
      *lval = Z_LVAL_P(input);
      *dval = (double) Z_LVAL_P(input);
      return IS_LONG;
    case IS_DOUBLE:
      *dval = Z_DVAL_P(input);
      check_dval_value:
      if (zend_isinf(*dval)) {
        zend_argument_value_error(arg_num, "must be a finite number, INF provided");
        return 0;
      }
      if (zend_isnan(*dval)) {
        zend_argument_value_error(arg_num, "must be a finite number, NAN provided");
        return 0;
      }
      return IS_DOUBLE;
    case IS_STRING: {
      /* Process strings:
       * - Empty strings are converted to 0 with a diagnostic
       * - Check if string is numeric and store the values in passed pointer
       * - If numeric float, this means it cannot be a numeric string with only one byte GOTO IS_DOUBLE
       * - If numeric int, check it is one byte or not
       *   - If it one byte, return IS_ARRAY as IS_LONG < IS_STRING < IS_ARRAY
       *   - If not should only be interpreted as int, return IS_LONG;
       * - Otherwise is a string and return IS_STRING */
      if (Z_STRLEN_P(input) == 0) {
        const char *arg_name = get_active_function_arg_name(arg_num);
        php_error_docref(NULL, E_WARNING, "Argument #%d ($%s) must not be empty, casted to 0", arg_num, arg_name);
        if (UNEXPECTED(EG(exception))) {
          return 0;
        }
        *lval = 0;
        *dval = 0.0;
        return IS_LONG;
      }
      uint8_t type = is_numeric_str_function(Z_STR_P(input), lval, dval);
      if (type == IS_DOUBLE) {
        goto check_dval_value;
      }
      if (type == IS_LONG) {
        *dval = (double) *lval;
        if (Z_STRLEN_P(input) == 1) {
          return IS_ARRAY;
        } else {
          return IS_LONG;
        }
      }
      if (Z_STRLEN_P(input) != 1) {
        const char *arg_name = get_active_function_arg_name(arg_num);
        php_error_docref(NULL, E_WARNING, "Argument #%d ($%s) must be a single byte, subsequent bytes are ignored", arg_num, arg_name);
        if (UNEXPECTED(EG(exception))) {
          return 0;
        }
      }
      /* Set fall back values to 0 in case the other argument is not a string */
      *lval = 0;
      *dval = 0.0;
      return IS_STRING;
    }
    default: ZEND_UNREACHABLE();
  }
}

/* {{{ Create an array containing the range of integers or characters from low to high (inclusive) */
PHP_FUNCTION(range)
{
  zval *user_start, *user_end, *user_step = NULL, tmp;
  bool is_step_double = false;
  bool is_step_negative = false;
  double step_double = 1.0;
  zend_long step = 1;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_NUMBER_OR_STR(user_start)
    Z_PARAM_NUMBER_OR_STR(user_end)
    Z_PARAM_OPTIONAL
    Z_PARAM_NUMBER(user_step)
  ZEND_PARSE_PARAMETERS_END();

  if (user_step) {
    if (UNEXPECTED(Z_TYPE_P(user_step) == IS_DOUBLE)) {
      step_double = Z_DVAL_P(user_step);

      if (zend_isinf(step_double)) {
        zend_argument_value_error(3, "must be a finite number, INF provided");
        RETURN_THROWS();
      }
      if (zend_isnan(step_double)) {
        zend_argument_value_error(3, "must be a finite number, NAN provided");
        RETURN_THROWS();
      }

      /* We only want positive step values. */
      if (step_double < 0.0) {
        is_step_negative = true;
        step_double *= -1;
      }
      step = zend_dval_to_lval_silent(step_double);
      if (!zend_is_long_compatible(step_double, step)) {
        is_step_double = true;
      }
    } else {
      step = Z_LVAL_P(user_step);
      /* We only want positive step values. */
      if (step < 0) {
        if (UNEXPECTED(step == ZEND_LONG_MIN)) {
          zend_argument_value_error(3, "must be greater than " ZEND_LONG_FMT, step);
          RETURN_THROWS();
        }
        is_step_negative = true;
        step *= -1;
      }
      step_double = (double) step;
    }
    if (step_double == 0.0) {
      zend_argument_value_error(3, "cannot be 0");
      RETURN_THROWS();
    }
  }

  uint8_t start_type;
  double start_double;
  zend_long start_long;
  uint8_t end_type;
  double end_double;
  zend_long end_long;

  start_type = php_range_process_input(user_start, 1, &start_long, &start_double);
  if (start_type == 0) {
    RETURN_THROWS();
  }
  end_type = php_range_process_input(user_end, 2, &end_long, &end_double);
  if (end_type == 0) {
    RETURN_THROWS();
  }

  /* If the range is given as strings, generate an array of characters. */
  if (start_type >= IS_STRING || end_type >= IS_STRING) {
    /* If one of the inputs is NOT a string nor single-byte string */
    if (UNEXPECTED(start_type < IS_STRING || end_type < IS_STRING)) {
      if (start_type < IS_STRING) {
        if (end_type != IS_ARRAY) {
          php_error_docref(NULL, E_WARNING, "Argument #1 ($start) must be a single byte string if"
            " argument #2 ($end) is a single byte string, argument #2 ($end) converted to 0");
        }
        end_type = IS_LONG;
      } else if (end_type < IS_STRING) {
        if (start_type != IS_ARRAY) {
          php_error_docref(NULL, E_WARNING, "Argument #2 ($end) must be a single byte string if"
            " argument #1 ($start) is a single byte string, argument #1 ($start) converted to 0");
        }
        start_type = IS_LONG;
      }
      if (UNEXPECTED(EG(exception))) {
        RETURN_THROWS();
      }
      goto handle_numeric_inputs;
    }

    if (is_step_double) {
      /* Only emit warning if one of the input is not a numeric digit */
      if (start_type == IS_STRING || end_type == IS_STRING) {
        php_error_docref(NULL, E_WARNING, "Argument #3 ($step) must be of type int when generating an array"
          " of characters, inputs converted to 0");
        if (UNEXPECTED(EG(exception))) {
          RETURN_THROWS();
        }
      }
      end_type = IS_LONG;
      start_type = IS_LONG;
      goto handle_numeric_inputs;
    }

    /* Generate array of characters, as zero-extended ints to make bounds checking possible in the loop condition */
    int low = (unsigned char) Z_STRVAL_P(user_start)[0];
    int high = (unsigned char) Z_STRVAL_P(user_end)[0];

    /* Decreasing char range */
    if (low > high) {
      if (low - high < step) {
        goto boundary_error;
      }
      /* Initialize the return_value as an array. */
      array_init_size(return_value, (uint32_t)(((low - high) / step) + 1));
      zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (; low >= high; low -= step) {
          ZEND_HASH_FILL_SET_INTERNED_STR(ZSTR_CHAR(low));
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else if (high > low) { /* Increasing char range */
      if (is_step_negative) {
        goto negative_step_error;
      }
      if (high - low < step) {
        goto boundary_error;
      }
      array_init_size(return_value, (uint32_t)(((high - low) / step) + 1));
      zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (; low <= high; low += step) {
          ZEND_HASH_FILL_SET_INTERNED_STR(ZSTR_CHAR(low));
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else {
      array_init(return_value);
      ZVAL_CHAR(&tmp, low);
      zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &tmp);
    }
    return;
  }

  handle_numeric_inputs:
  if (start_type == IS_DOUBLE || end_type == IS_DOUBLE || is_step_double) {
    double element;
    uint32_t i, size;

    /* Decreasing float range */
    if (start_double > end_double) {
      if (start_double - end_double < step_double) {
        goto boundary_error;
      }

      RANGE_CHECK_DOUBLE_INIT_ARRAY(start_double, end_double, step_double);

      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0, element = start_double; i < size && element >= end_double; ++i, element = start_double - (i * step_double)) {
          ZEND_HASH_FILL_SET_DOUBLE(element);
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else if (end_double > start_double) { /* Increasing float range */
      if (is_step_negative) {
        goto negative_step_error;
      }
      if (end_double - start_double < step_double) {
        goto boundary_error;
      }

      RANGE_CHECK_DOUBLE_INIT_ARRAY(end_double, start_double, step_double);

      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0, element = start_double; i < size && element <= end_double; ++i, element = start_double + (i * step_double)) {
          ZEND_HASH_FILL_SET_DOUBLE(element);
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else {
      array_init(return_value);
      ZVAL_DOUBLE(&tmp, start_double);
      zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &tmp);
    }
  } else {
    ZEND_ASSERT(start_type == IS_LONG && end_type == IS_LONG && !is_step_double);
    /* unsigned_step is a zend_ulong so that comparisons to it don't overflow, i.e. low - high < lstep */
    zend_ulong unsigned_step= (zend_ulong)step;
    uint32_t i, size;

    /* Decreasing int range */
    if (start_long > end_long) {
      if ((zend_ulong)start_long - end_long < unsigned_step) {
        goto boundary_error;
      }

      RANGE_CHECK_LONG_INIT_ARRAY(start_long, end_long, unsigned_step);

      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0; i < size; ++i) {
          ZEND_HASH_FILL_SET_LONG(start_long - (i * unsigned_step));
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else if (end_long > start_long) { /* Increasing int range */
      if (is_step_negative) {
        goto negative_step_error;
      }
      if ((zend_ulong)end_long - start_long < unsigned_step) {
        goto boundary_error;
      }

      RANGE_CHECK_LONG_INIT_ARRAY(end_long, start_long, unsigned_step);

      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0; i < size; ++i) {
          ZEND_HASH_FILL_SET_LONG(start_long + (i * unsigned_step));
          ZEND_HASH_FILL_NEXT();
        }
      } ZEND_HASH_FILL_END();
    } else {
      array_init(return_value);
      ZVAL_LONG(&tmp, start_long);
      zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &tmp);
    }
  }
  return;

negative_step_error:
  zend_argument_value_error(3, "must be greater than 0 for increasing ranges");
  RETURN_THROWS();

boundary_error:
  zend_argument_value_error(3, "must be less than the range spanned by argument #1 ($start) and argument #2 ($end)");
  RETURN_THROWS();
}
/* }}} */

#undef RANGE_CHECK_DOUBLE_INIT_ARRAY
#undef RANGE_CHECK_LONG_INIT_ARRAY

/* {{{ php_array_data_shuffle */
PHPAPI bool php_array_data_shuffle(php_random_algo_with_state engine, zval *array) /* {{{ */
{
  const php_random_algo *algo = engine.algo;
  void *state = engine.state;

  int64_t idx, j, n_elems, rnd_idx, n_left;
  zval *zv, temp;
  HashTable *hash;

  n_elems = zend_hash_num_elements(Z_ARRVAL_P(array));

  if (n_elems < 1) {
    return true;
  }

  hash = Z_ARRVAL_P(array);
  n_left = n_elems;

  if (!HT_IS_PACKED(hash)) {
    if (!HT_HAS_STATIC_KEYS_ONLY(hash)) {
      Bucket *p = hash->arData;
      zend_long i = hash->nNumUsed;

      for (; i > 0; p++, i--) {
        if (p->key) {
          zend_string_release(p->key);
          p->key = NULL;
        }
      }
    }
    zend_hash_to_packed(hash);
  }

  if (EXPECTED(!HT_HAS_ITERATORS(hash))) {
    if (hash->nNumUsed != hash->nNumOfElements) {
      for (j = 0, idx = 0; idx < hash->nNumUsed; idx++) {
        zv = hash->arPacked + idx;
        if (Z_TYPE_P(zv) == IS_UNDEF) continue;
        if (j != idx) {
          ZVAL_COPY_VALUE(&hash->arPacked[j], zv);
        }
        j++;
      }
    }
    while (--n_left) {
      rnd_idx = algo->range(state, 0, n_left);
      if (EG(exception)) {
        return false;
      }
      if (rnd_idx != n_left) {
        ZVAL_COPY_VALUE(&temp, &hash->arPacked[n_left]);
        ZVAL_COPY_VALUE(&hash->arPacked[n_left], &hash->arPacked[rnd_idx]);
        ZVAL_COPY_VALUE(&hash->arPacked[rnd_idx], &temp);
      }
    }
  } else {
    zend_long iter_pos = zend_hash_iterators_lower_pos(hash, 0);

    if (hash->nNumUsed != hash->nNumOfElements) {
      for (j = 0, idx = 0; idx < hash->nNumUsed; idx++) {
        zv = hash->arPacked + idx;
        if (Z_TYPE_P(zv) == IS_UNDEF) continue;
        if (j != idx) {
          ZVAL_COPY_VALUE(&hash->arPacked[j], zv);
          if (idx == iter_pos) {
            zend_hash_iterators_update(hash, idx, j);
            iter_pos = zend_hash_iterators_lower_pos(hash, iter_pos + 1);
          }
        }
        j++;
      }
    }
    while (--n_left) {
      rnd_idx = algo->range(state, 0, n_left);
      if (EG(exception)) {
        return false;
      }
      if (rnd_idx != n_left) {
        ZVAL_COPY_VALUE(&temp, &hash->arPacked[n_left]);
        ZVAL_COPY_VALUE(&hash->arPacked[n_left], &hash->arPacked[rnd_idx]);
        ZVAL_COPY_VALUE(&hash->arPacked[rnd_idx], &temp);
        zend_hash_iterators_update(hash, (uint32_t)rnd_idx, n_left);
      }
    }
  }
  hash->nNumUsed = n_elems;
  hash->nInternalPointer = 0;
  hash->nNextFreeElement = n_elems;

  return true;
}
/* }}} */

/* {{{ Randomly shuffle the contents of an array */
PHP_FUNCTION(shuffle)
{
  zval *array;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_EX(array, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  php_array_data_shuffle(php_random_default_engine(), array);

  RETURN_TRUE;
}
/* }}} */

static void php_splice(HashTable *in_hash, zend_long offset, zend_long length, HashTable *replace, HashTable *removed) /* {{{ */
{
  HashTable    out_hash;      /* Output hashtable */
  zend_long  num_in;      /* Number of entries in the input hashtable */
  zend_long  pos;       /* Current position in the hashtable */
  uint32_t     idx;
  zval    *entry;       /* Hash entry */
  uint32_t    iter_pos = zend_hash_iterators_lower_pos(in_hash, 0);

  GC_ADDREF(in_hash);
  HT_ALLOW_COW_VIOLATION(in_hash); /* Will be reset when setting the flags for in_hash */

  /* Get number of entries in the input hash */
  num_in = zend_hash_num_elements(in_hash);

  /* Clamp the offset.. */
  if (offset > num_in) {
    offset = num_in;
  } else if (offset < 0 && (offset = (num_in + offset)) < 0) {
    offset = 0;
  }

  /* ..and the length */
  if (length < 0) {
    length = num_in - offset + length;
  } else if (((unsigned)offset + (unsigned)length) > (unsigned)num_in) {
    length = num_in - offset;
  }

  /* Number of entries in the output hash: the input entries that are kept
   * plus the replacement entries. After clamping, a non-positive length
   * removes nothing, so all input entries are kept. */
  uint32_t num_out = num_in - MAX(length, 0) + (replace ? zend_hash_num_elements(replace) : 0);

  /* Create and initialize output hash */
  zend_hash_init(&out_hash, num_out, NULL, ZVAL_PTR_DTOR, 0);

  if (HT_IS_PACKED(in_hash)) {
    /* Start at the beginning of the input hash and copy entries to output hash until offset is reached */
    entry = in_hash->arPacked;
    for (pos = 0, idx = 0; pos < offset && idx < in_hash->nNumUsed; idx++, entry++) {
      if (Z_TYPE_P(entry) == IS_UNDEF) continue;

      zend_hash_next_index_insert_new(&out_hash, entry);
      if (idx == iter_pos) {
        if ((zend_long)idx != pos) {
          zend_hash_iterators_update(in_hash, idx, pos);
        }
        iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
      }
      pos++;
    }

    /* If hash for removed entries exists, go until offset+length and copy the entries to it */
    if (removed != NULL) {
      for ( ; pos - offset < length && idx < in_hash->nNumUsed; idx++, entry++) {
        if (Z_TYPE_P(entry) == IS_UNDEF) continue;
        pos++;
        Z_TRY_ADDREF_P(entry);
        zend_hash_next_index_insert_new(removed, entry);
        zend_hash_packed_del_val(in_hash, entry);
        /* Bump iterator positions to the element after replacement. */
        if (idx == iter_pos) {
          zend_hash_iterators_update(in_hash, idx, offset + length);
          iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
        }
      }
    } else { /* otherwise just skip those entries */
      zend_long pos2 = pos;

      for ( ; pos2 - offset < length && idx < in_hash->nNumUsed; idx++, entry++) {
        if (Z_TYPE_P(entry) == IS_UNDEF) continue;
        pos2++;
        zend_hash_packed_del_val(in_hash, entry);
        /* Bump iterator positions to the element after replacement. */
        if (idx == iter_pos) {
          zend_hash_iterators_update(in_hash, idx, offset + length);
          iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
        }
      }
    }

    /* If there are entries to insert.. */
    if (replace) {
      ZEND_HASH_FOREACH_VAL(replace, entry) {
        Z_TRY_ADDREF_P(entry);
        zend_hash_next_index_insert_new(&out_hash, entry);
        pos++;
      } ZEND_HASH_FOREACH_END();
    }

    /* Copy the remaining input hash entries to the output hash */
    entry = in_hash->arPacked + idx;
    for ( ; idx < in_hash->nNumUsed ; idx++, entry++) {
      if (Z_TYPE_P(entry) == IS_UNDEF) continue;
      zend_hash_next_index_insert_new(&out_hash, entry);
      if (idx == iter_pos) {
        if ((zend_long)idx != pos) {
          zend_hash_iterators_update(in_hash, idx, pos);
        }
        iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
      }
      pos++;
    }
  } else {
    Bucket *p = in_hash->arData;

    /* Start at the beginning of the input hash and copy entries to output hash until offset is reached */
    for (pos = 0, idx = 0; pos < offset && idx < in_hash->nNumUsed; idx++, p++) {
      if (Z_TYPE(p->val) == IS_UNDEF) continue;
      entry = &p->val;

      /* Update output hash depending on key type */
      if (p->key == NULL) {
        zend_hash_next_index_insert_new(&out_hash, entry);
      } else {
        zend_hash_add_new(&out_hash, p->key, entry);
      }
      if (idx == iter_pos) {
        if ((zend_long)idx != pos) {
          zend_hash_iterators_update(in_hash, idx, pos);
        }
        iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
      }
      pos++;
    }

    /* If hash for removed entries exists, go until offset+length and copy the entries to it */
    if (removed != NULL) {
      for ( ; pos - offset < length && idx < in_hash->nNumUsed; idx++, p++) {
        if (Z_TYPE(p->val) == IS_UNDEF) continue;
        pos++;
        entry = &p->val;
        Z_TRY_ADDREF_P(entry);
        if (p->key == NULL) {
          zend_hash_next_index_insert_new(removed, entry);
        } else {
          zend_hash_add_new(removed, p->key, entry);
        }
        zend_hash_del_bucket(in_hash, p);
      }
    } else { /* otherwise just skip those entries */
      zend_long pos2 = pos;

      for ( ; pos2 - offset < length && idx < in_hash->nNumUsed; idx++, p++) {
        if (Z_TYPE(p->val) == IS_UNDEF) continue;
        pos2++;
        zend_hash_del_bucket(in_hash, p);
      }
    }
    iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos);

    /* If there are entries to insert.. */
    if (replace) {
      ZEND_HASH_FOREACH_VAL(replace, entry) {
        Z_TRY_ADDREF_P(entry);
        zend_hash_next_index_insert_new(&out_hash, entry);
        pos++;
      } ZEND_HASH_FOREACH_END();
    }

    /* Copy the remaining input hash entries to the output hash */
    for ( ; idx < in_hash->nNumUsed ; idx++, p++) {
      if (Z_TYPE(p->val) == IS_UNDEF) continue;
      entry = &p->val;
      if (p->key == NULL) {
        zend_hash_next_index_insert_new(&out_hash, entry);
      } else {
        zend_hash_add_new(&out_hash, p->key, entry);
      }
      if (idx == iter_pos) {
        if ((zend_long)idx != pos) {
          zend_hash_iterators_update(in_hash, idx, pos);
        }
        iter_pos = zend_hash_iterators_lower_pos(in_hash, iter_pos + 1);
      }
      pos++;
    }
  }

  /* replace HashTable data */
  HT_SET_ITERATORS_COUNT(&out_hash, HT_ITERATORS_COUNT(in_hash));
  HT_SET_ITERATORS_COUNT(in_hash, 0);
  in_hash->pDestructor = NULL;

  /* Set internal pointer to 0 directly instead of calling zend_hash_internal_pointer_reset().
   * This avoids the COW violation assertion and delays advancing to the first valid position
   * until after we've switched to the new array structure (out_hash). The iterator will be
   * advanced when actually accessed, at which point it will find valid indexes in the new array. */
  in_hash->nInternalPointer = 0;

  if (UNEXPECTED(GC_DELREF(in_hash) == 0)) {
    /* Array was completely deallocated during the operation */
    zend_array_destroy(in_hash);
    zend_hash_destroy(&out_hash);
    zend_throw_error(NULL, "Array was modified during array_splice operation");
    return;
  }

  uint32_t type_info = GC_TYPE_INFO(in_hash);
  GC_TYPE_INFO(in_hash) = GC_ARRAY;

  zend_hash_destroy(in_hash);
  GC_TYPE_INFO(in_hash) = type_info;

  HT_FLAGS(in_hash)          = HT_FLAGS(&out_hash);
  in_hash->nTableSize        = out_hash.nTableSize;
  in_hash->nTableMask        = out_hash.nTableMask;
  in_hash->nNumUsed          = out_hash.nNumUsed;
  in_hash->nNumOfElements    = out_hash.nNumOfElements;
  in_hash->nNextFreeElement  = out_hash.nNextFreeElement;
  in_hash->arData            = out_hash.arData;
  in_hash->pDestructor       = out_hash.pDestructor;
}
/* }}} */

/* {{{ Pushes elements onto the end of the array */
PHP_FUNCTION(array_push)
{
  zval   *args,   /* Function arguments array */
       *stack;    /* Input array */
  uint32_t argc;    /* Number of function arguments */


  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_ARRAY_EX(stack, 0, 1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  /* For each subsequent argument, make it a reference, increase refcount, and add it to the end of the array */
  for (uint32_t i = 0; i < argc; i++) {
    Z_TRY_ADDREF(args[i]);

    if (zend_hash_next_index_insert(Z_ARRVAL_P(stack), &args[i]) == NULL) {
      Z_TRY_DELREF(args[i]);
      zend_throw_error(NULL, "Cannot add element to the array as the next element is already occupied");
      RETURN_THROWS();
    }
  }

  /* Clean up and return the number of values in the stack */
  RETVAL_LONG(zend_hash_num_elements(Z_ARRVAL_P(stack)));
}
/* }}} */

/* {{{ Pops an element off the end of the array */
PHP_FUNCTION(array_pop)
{
  zval *stack,  /* Input stack */
     *val;    /* Value to be popped */
  uint32_t idx;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_EX(stack, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  if (zend_hash_num_elements(Z_ARRVAL_P(stack)) == 0) {
    return;
  }

  if (HT_IS_PACKED(Z_ARRVAL_P(stack))) {
    /* Get the last value and copy it into the return value */
    idx = Z_ARRVAL_P(stack)->nNumUsed;
    while (1) {
      if (idx == 0) {
        return;
      }
      idx--;
      val = Z_ARRVAL_P(stack)->arPacked + idx;
      if (Z_TYPE_P(val) != IS_UNDEF) {
        break;
      }
    }
    RETVAL_COPY_VALUE(val);
    ZVAL_UNDEF(val);

    if (idx == (Z_ARRVAL_P(stack)->nNextFreeElement - 1)) {
      Z_ARRVAL_P(stack)->nNextFreeElement = Z_ARRVAL_P(stack)->nNextFreeElement - 1;
    }

    /* Delete the last value */
    zend_hash_packed_del_val(Z_ARRVAL_P(stack), val);
  } else {
    Bucket *p;

    /* Get the last value and copy it into the return value */
    idx = Z_ARRVAL_P(stack)->nNumUsed;
    while (1) {
      if (idx == 0) {
        return;
      }
      idx--;
      p = Z_ARRVAL_P(stack)->arData + idx;
      val = &p->val;
      if (Z_TYPE_P(val) != IS_UNDEF) {
        break;
      }
    }
    RETVAL_COPY_VALUE(val);
    ZVAL_UNDEF(val);

    if (!p->key && (zend_long)p->h == (Z_ARRVAL_P(stack)->nNextFreeElement - 1)) {
      Z_ARRVAL_P(stack)->nNextFreeElement = Z_ARRVAL_P(stack)->nNextFreeElement - 1;
    }

    /* Delete the last value */
    zend_hash_del_bucket(Z_ARRVAL_P(stack), p);
  }
  zend_hash_internal_pointer_reset(Z_ARRVAL_P(stack));

  if (Z_ISREF_P(return_value)) {
    zend_unwrap_reference(return_value);
  }
}
/* }}} */

/* {{{ Pops an element off the beginning of the array */
PHP_FUNCTION(array_shift)
{
  zval *stack,  /* Input stack */
     *val;    /* Value to be popped */
  uint32_t idx;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_EX(stack, 0, 1)
  ZEND_PARSE_PARAMETERS_END();

  if (zend_hash_num_elements(Z_ARRVAL_P(stack)) == 0) {
    return;
  }

  /* re-index like it did before */
  if (HT_IS_PACKED(Z_ARRVAL_P(stack))) {
    uint32_t k = 0;

    /* Get the first value and copy it into the return value */
    idx = 0;
    while (1) {
      if (idx == Z_ARRVAL_P(stack)->nNumUsed) {
        return;
      }
      val = Z_ARRVAL_P(stack)->arPacked + idx;
      if (Z_TYPE_P(val) != IS_UNDEF) {
        break;
      }
      idx++;
    }
    RETVAL_COPY_VALUE(val);
    ZVAL_UNDEF(val);

    /* Delete the first value */
    zend_hash_packed_del_val(Z_ARRVAL_P(stack), val);

    if (EXPECTED(!HT_HAS_ITERATORS(Z_ARRVAL_P(stack)))) {
      for (idx = 0; idx < Z_ARRVAL_P(stack)->nNumUsed; idx++) {
        val = Z_ARRVAL_P(stack)->arPacked + idx;
        if (Z_TYPE_P(val) == IS_UNDEF) continue;
        if (idx != k) {
          zval *q = Z_ARRVAL_P(stack)->arPacked + k;
          ZVAL_COPY_VALUE(q, val);
          ZVAL_UNDEF(val);
        }
        k++;
      }
    } else {
      uint32_t iter_pos = zend_hash_iterators_lower_pos(Z_ARRVAL_P(stack), 0);

      for (idx = 0; idx < Z_ARRVAL_P(stack)->nNumUsed; idx++) {
        val = Z_ARRVAL_P(stack)->arPacked + idx;
        if (Z_TYPE_P(val) == IS_UNDEF) continue;
        if (idx != k) {
          zval *q = Z_ARRVAL_P(stack)->arPacked + k;
          ZVAL_COPY_VALUE(q, val);
          ZVAL_UNDEF(val);
          if (idx == iter_pos) {
            zend_hash_iterators_update(Z_ARRVAL_P(stack), idx, k);
            iter_pos = zend_hash_iterators_lower_pos(Z_ARRVAL_P(stack), iter_pos + 1);
          }
        }
        k++;
      }
    }
    Z_ARRVAL_P(stack)->nNumUsed = k;
    Z_ARRVAL_P(stack)->nNextFreeElement = k;
  } else {
    uint32_t k = 0;
    int should_rehash = 0;
    Bucket *p;

    /* Get the first value and copy it into the return value */
    idx = 0;
    while (1) {
      if (idx == Z_ARRVAL_P(stack)->nNumUsed) {
        return;
      }
      p = Z_ARRVAL_P(stack)->arData + idx;
      val = &p->val;
      if (Z_TYPE_P(val) != IS_UNDEF) {
        break;
      }
      idx++;
    }
    RETVAL_COPY_VALUE(val);
    ZVAL_UNDEF(val);

    /* Delete the first value */
    zend_hash_del_bucket(Z_ARRVAL_P(stack), p);

    for (idx = 0; idx < Z_ARRVAL_P(stack)->nNumUsed; idx++) {
      p = Z_ARRVAL_P(stack)->arData + idx;
      if (Z_TYPE(p->val) == IS_UNDEF) continue;
      if (p->key == NULL) {
        if (p->h != k) {
          p->h = k++;
          should_rehash = 1;
        } else {
          k++;
        }
      }
    }
    Z_ARRVAL_P(stack)->nNextFreeElement = k;
    if (should_rehash) {
      zend_hash_rehash(Z_ARRVAL_P(stack));
    }
  }

  zend_hash_internal_pointer_reset(Z_ARRVAL_P(stack));

  if (Z_ISREF_P(return_value)) {
    zend_unwrap_reference(return_value);
  }
}
/* }}} */

/* {{{ Pushes elements onto the beginning of the array */
PHP_FUNCTION(array_unshift)
{
  zval   *args,     /* Function arguments array */
       *stack;      /* Input stack */
  HashTable new_hash;   /* New hashtable for the stack */
  uint32_t argc;      /* Number of function arguments */
  zend_string *key;
  zval *value;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_ARRAY_EX(stack, 0, 1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  zend_hash_init(&new_hash, zend_hash_num_elements(Z_ARRVAL_P(stack)) + argc, NULL, ZVAL_PTR_DTOR, 0);

  if (HT_IS_PACKED(Z_ARRVAL_P(stack))) {
    zend_hash_real_init_packed(&new_hash);

    ZEND_HASH_FILL_PACKED(&new_hash) {
      for (uint32_t i = 0; i < argc; i++) {
        Z_TRY_ADDREF(args[i]);
        ZEND_HASH_FILL_ADD(&args[i]);
      }

      ZEND_HASH_PACKED_FOREACH_VAL(Z_ARRVAL_P(stack), value) {
        ZEND_HASH_FILL_ADD(value);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();
  } else {
    for (uint32_t i = 0; i < argc; i++) {
      Z_TRY_ADDREF(args[i]);
      zend_hash_next_index_insert_new(&new_hash, &args[i]);
    }

    ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(stack), key, value) {
      if (key) {
        zend_hash_add_new(&new_hash, key, value);
      } else {
        zend_hash_next_index_insert_new(&new_hash, value);
      }
    } ZEND_HASH_FOREACH_END();
  }

  if (UNEXPECTED(HT_HAS_ITERATORS(Z_ARRVAL_P(stack)))) {
    zend_hash_iterators_advance(Z_ARRVAL_P(stack), argc);
    HT_SET_ITERATORS_COUNT(&new_hash, HT_ITERATORS_COUNT(Z_ARRVAL_P(stack)));
    HT_SET_ITERATORS_COUNT(Z_ARRVAL_P(stack), 0);
  }

  /* replace HashTable data */
  Z_ARRVAL_P(stack)->pDestructor = NULL;
  uint32_t type_info = GC_TYPE_INFO(Z_ARRVAL_P(stack));
  GC_TYPE_INFO(Z_ARRVAL_P(stack)) = GC_ARRAY;
  zend_hash_destroy(Z_ARRVAL_P(stack));

  GC_TYPE_INFO(Z_ARRVAL_P(stack)) = type_info;
  HT_FLAGS(Z_ARRVAL_P(stack))          = HT_FLAGS(&new_hash);
  Z_ARRVAL_P(stack)->nTableSize        = new_hash.nTableSize;
  Z_ARRVAL_P(stack)->nTableMask        = new_hash.nTableMask;
  Z_ARRVAL_P(stack)->nNumUsed          = new_hash.nNumUsed;
  Z_ARRVAL_P(stack)->nNumOfElements    = new_hash.nNumOfElements;
  Z_ARRVAL_P(stack)->nNextFreeElement  = new_hash.nNextFreeElement;
  Z_ARRVAL_P(stack)->arData            = new_hash.arData;
  Z_ARRVAL_P(stack)->pDestructor       = new_hash.pDestructor;

  zend_hash_internal_pointer_reset(Z_ARRVAL_P(stack));

  /* Clean up and return the number of elements in the stack */
  RETVAL_LONG(zend_hash_num_elements(Z_ARRVAL_P(stack)));
}
/* }}} */

/* {{{ Removes the elements designated by offset and length and replace them with supplied array */
PHP_FUNCTION(array_splice)
{
  zval *array,        /* Input array */
     *repl_array = NULL; /* Replacement array */
  HashTable  *rem_hash = NULL;
  zend_long offset,
      length = 0;
  bool length_is_null = 1;
  int   num_in;       /* Number of elements in the input array */

  ZEND_PARSE_PARAMETERS_START(2, 4)
    Z_PARAM_ARRAY_EX(array, 0, 1)
    Z_PARAM_LONG(offset)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG_OR_NULL(length, length_is_null)
    Z_PARAM_ZVAL(repl_array)
  ZEND_PARSE_PARAMETERS_END();

  num_in = zend_hash_num_elements(Z_ARRVAL_P(array));

  if (length_is_null) {
    length = num_in;
  }

  if (ZEND_NUM_ARGS() == 4) {
    /* Make sure the last argument, if passed, is an array */
    convert_to_array(repl_array);
  }

  /* Don't create the array of removed elements if it's not going
   * to be used; e.g. only removing and/or replacing elements */
  if (USED_RET()) {
    zend_long size = length;

    /* Clamp the offset.. */
    if (offset > num_in) {
      offset = num_in;
    } else if (offset < 0 && (offset = (num_in + offset)) < 0) {
      offset = 0;
    }

    /* ..and the length */
    if (length < 0) {
      size = num_in - offset + length;
    } else if (((zend_ulong) offset + (zend_ulong) length) > (uint32_t) num_in) {
      size = num_in - offset;
    }

    /* Initialize return value */
    array_init_size(return_value, size > 0 ? (uint32_t)size : 0);
    rem_hash = Z_ARRVAL_P(return_value);
  } else {
    /* The return value will not be used, but make sure it still has the correct type. */
    RETVAL_EMPTY_ARRAY();
  }

  /* Perform splice */
  php_splice(Z_ARRVAL_P(array), offset, length, repl_array ? Z_ARRVAL_P(repl_array) : NULL, rem_hash);
}
/* }}} */

/* {{{ find_bucket_at_offset(HashTable* ht, zend_long offset)
   Finds the bucket at the given valid offset */
static inline Bucket* find_bucket_at_offset(HashTable* ht, zend_long offset)
{
  zend_long pos;
  Bucket *bucket;
  ZEND_ASSERT(offset >= 0 && offset <= ht->nNumOfElements);
  if (HT_IS_WITHOUT_HOLES(ht)) {
    /* There's no need to iterate over the array to filter out holes if there are no holes */
    return ht->arData + offset;
  }
  /* Otherwise, this code has to iterate over the HashTable and skip holes in the array. */
  pos = 0;
  ZEND_HASH_MAP_FOREACH_BUCKET(ht, bucket) {
    if (pos >= offset) {
      /* This is the bucket of the array element at the requested offset */
      return bucket;
    }
    ++pos;
  } ZEND_HASH_FOREACH_END();

  /* Return a pointer to the end of the bucket array. */
  return ht->arData + ht->nNumUsed;
}
/* }}} */

/* {{{ find_bucket_at_offset(HashTable* ht, zend_long offset)
   Finds the bucket at the given valid offset */
static inline zval* find_packed_val_at_offset(HashTable* ht, zend_long offset)
{
  zend_long pos;
  zval *zv;
  ZEND_ASSERT(offset >= 0 && offset <= ht->nNumOfElements);
  if (HT_IS_WITHOUT_HOLES(ht)) {
    /* There's no need to iterate over the array to filter out holes if there are no holes */
    return ht->arPacked + offset;
  }
  /* Otherwise, this code has to iterate over the HashTable and skip holes in the array. */
  pos = 0;
  ZEND_HASH_PACKED_FOREACH_VAL(ht, zv) {
    if (pos >= offset) {
      /* This is the bucket of the array element at the requested offset */
      return zv;
    }
    ++pos;
  } ZEND_HASH_FOREACH_END();

  /* Return a pointer to the end of the bucket array. */
  return ht->arPacked + ht->nNumUsed;
}
/* }}} */

/* {{{ Returns elements specified by offset and length */
PHP_FUNCTION(array_slice)
{
  zval *input;                  /* Input array */
  zval *entry;                  /* An array entry */
  zend_long offset;             /* Offset to get elements from */
  zend_long length = 0;         /* How many elements to get */
  bool length_is_null = 1; /* Whether an explicit length has been omitted */
  bool preserve_keys = 0;  /* Whether to preserve keys while copying to the new array */
  uint32_t num_in;              /* Number of elements in the input array */
  zend_string *string_key;
  zend_ulong num_key;

  ZEND_PARSE_PARAMETERS_START(2, 4)
    Z_PARAM_ARRAY(input)
    Z_PARAM_LONG(offset)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG_OR_NULL(length, length_is_null)
    Z_PARAM_BOOL(preserve_keys)
  ZEND_PARSE_PARAMETERS_END();

  /* Get number of entries in the input hash */
  num_in = zend_hash_num_elements(Z_ARRVAL_P(input));

  /* We want all entries from offset to the end if length is not passed or is null */
  if (length_is_null) {
    length = num_in;
  }

  /* Clamp the offset.. */
  if (offset > (zend_long) num_in) {
    RETURN_EMPTY_ARRAY();
  } else if (offset < 0 && (offset = (num_in + offset)) < 0) {
    offset = 0;
  }

  /* ..and the length */
  if (length < 0) {
    length = num_in - offset + length;
  } else if (((zend_ulong) offset + (zend_ulong) length) > (unsigned) num_in) {
    length = num_in - offset;
  }

  if (length <= 0) {
    RETURN_EMPTY_ARRAY();
  }

  /* Initialize returned array */
  array_init_size(return_value, (uint32_t)length);

  // Contains modified variants of ZEND_HASH_FOREACH_VAL
  {
    HashTable *ht = Z_ARRVAL_P(input);

    /* Start at the beginning and go until we hit offset */
    if (HT_IS_PACKED(ht)) {
      zval *zv = find_packed_val_at_offset(ht, offset);
      zval *end = ht->arPacked + ht->nNumUsed;

      if (!preserve_keys
       || (offset == 0 && HT_IS_WITHOUT_HOLES(ht))) {
        zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
        ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
          for (; zv != end; zv++) {
            if (__fill_idx >= length) {
              break;
            }
            if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) {
              continue;
            }
            entry = zv;
            if (UNEXPECTED(Z_ISREF_P(entry)) &&
              UNEXPECTED(Z_REFCOUNT_P(entry) == 1)) {
              entry = Z_REFVAL_P(entry);
            }
            Z_TRY_ADDREF_P(entry);
            ZEND_HASH_FILL_ADD(entry);
          }
        } ZEND_HASH_FILL_END();
      } else {
        zend_long n = 0;  /* Current number of elements */
        zend_long idx = zv - ht->arPacked;

        for (; zv != end; zv++, idx++) {
          if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) {
            continue;
          }
          if (n >= length) {
            break;
          }
          n++;
          entry = zend_hash_index_add_new(Z_ARRVAL_P(return_value), idx, zv);
          zval_add_ref(entry);
        }
      }
    } else {
      zend_long n = 0;  /* Current number of elements */
      Bucket *p = find_bucket_at_offset(ht, offset);
      Bucket *end = ht->arData + ht->nNumUsed;

      for (; p != end; p++) {
        entry = &p->val;
        if (UNEXPECTED(Z_TYPE_P(entry) == IS_UNDEF)) {
          continue;
        }
        if (n >= length) {
          break;
        }
        n++;
        num_key = p->h;
        string_key = p->key;

        if (string_key) {
          entry = zend_hash_add_new(Z_ARRVAL_P(return_value), string_key, entry);
        } else {
          if (preserve_keys) {
            entry = zend_hash_index_add_new(Z_ARRVAL_P(return_value), num_key, entry);
          } else {
            entry = zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), entry);
          }
        }
        zval_add_ref(entry);
      }
    }
  }
}
/* }}} */

PHPAPI int php_array_merge_recursive(HashTable *dest, HashTable *src) /* {{{ */
{
  zval *src_entry, *dest_entry;
  zend_string *string_key;

  ZEND_HASH_FOREACH_STR_KEY_VAL(src, string_key, src_entry) {
    if (string_key) {
      if ((dest_entry = zend_hash_find_known_hash(dest, string_key)) != NULL) {
        zval *src_zval = src_entry;
        zval *dest_zval = dest_entry;
        HashTable *thash;
        zval tmp;
        int ret;

        ZVAL_DEREF(src_zval);
        ZVAL_DEREF(dest_zval);
        thash = Z_TYPE_P(dest_zval) == IS_ARRAY ? Z_ARRVAL_P(dest_zval) : NULL;
        if ((thash && GC_IS_RECURSIVE(thash)) || (src_entry == dest_entry && Z_ISREF_P(dest_entry) && (Z_REFCOUNT_P(dest_entry) % 2))) {
          zend_throw_error(NULL, "Recursion detected");
          return 0;
        }

        ZEND_ASSERT(!Z_ISREF_P(dest_entry) || Z_REFCOUNT_P(dest_entry) > 1);
        dest_zval = dest_entry;

        if (Z_TYPE_P(dest_zval) == IS_NULL) {
          convert_to_array(dest_zval);
          add_next_index_null(dest_zval);
        } else {
          convert_to_array(dest_zval);
        }
        SEPARATE_ZVAL(dest_zval);

        ZVAL_UNDEF(&tmp);
        if (Z_TYPE_P(src_zval) == IS_OBJECT) {
          ZVAL_COPY(&tmp, src_zval);
          convert_to_array(&tmp);
          src_zval = &tmp;
        }
        if (Z_TYPE_P(src_zval) == IS_ARRAY) {
          if (thash) {
            GC_TRY_PROTECT_RECURSION(thash);
          }
          ret = php_array_merge_recursive(Z_ARRVAL_P(dest_zval), Z_ARRVAL_P(src_zval));
          if (thash) {
            GC_TRY_UNPROTECT_RECURSION(thash);
          }
          if (!ret) {
            zval_ptr_dtor(&tmp);
            return 0;
          }
        } else {
          Z_TRY_ADDREF_P(src_zval);
          zval *zv = zend_hash_next_index_insert(Z_ARRVAL_P(dest_zval), src_zval);
          if (UNEXPECTED(!zv)) {
            Z_TRY_DELREF_P(src_zval);
            zend_cannot_add_element();
            return 0;
          }
        }
        zval_ptr_dtor(&tmp);
      } else {
        zval *zv = zend_hash_add_new(dest, string_key, src_entry);
        zval_add_ref(zv);
      }
    } else {
      zval *zv = zend_hash_next_index_insert(dest, src_entry);
      if (UNEXPECTED(!zv)) {
        zend_cannot_add_element();
        return 0;
      }
      zval_add_ref(zv);
    }
  } ZEND_HASH_FOREACH_END();
  return 1;
}
/* }}} */

PHPAPI int php_array_merge(HashTable *dest, HashTable *src) /* {{{ */
{
  zval *src_entry;
  zend_string *string_key;

  if (HT_IS_PACKED(dest) && HT_IS_PACKED(src)) {
    zend_hash_extend(dest, zend_hash_num_elements(dest) + zend_hash_num_elements(src), 1);
    ZEND_HASH_FILL_PACKED(dest) {
      ZEND_HASH_PACKED_FOREACH_VAL(src, src_entry) {
        if (UNEXPECTED(Z_ISREF_P(src_entry)) &&
          UNEXPECTED(Z_REFCOUNT_P(src_entry) == 1)) {
          src_entry = Z_REFVAL_P(src_entry);
        }
        Z_TRY_ADDREF_P(src_entry);
        ZEND_HASH_FILL_ADD(src_entry);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();
  } else {
    ZEND_HASH_FOREACH_STR_KEY_VAL(src, string_key, src_entry) {
      if (UNEXPECTED(Z_ISREF_P(src_entry) &&
        Z_REFCOUNT_P(src_entry) == 1)) {
        src_entry = Z_REFVAL_P(src_entry);
      }
      Z_TRY_ADDREF_P(src_entry);
      if (string_key) {
        zend_hash_update(dest, string_key, src_entry);
      } else {
        zend_hash_next_index_insert_new(dest, src_entry);
      }
    } ZEND_HASH_FOREACH_END();
  }
  return 1;
}
/* }}} */

PHPAPI int php_array_replace_recursive(HashTable *dest, HashTable *src) /* {{{ */
{
  zval *src_entry, *dest_entry, *src_zval, *dest_zval;
  zend_string *string_key;
  zend_ulong num_key;
  int ret;

#ifdef ZEND_CHECK_STACK_LIMIT
  if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
    zend_call_stack_size_error();
    return 0;
  }
#endif

  ZEND_HASH_FOREACH_KEY_VAL(src, num_key, string_key, src_entry) {
    src_zval = src_entry;
    ZVAL_DEREF(src_zval);
    if (string_key) {
      if (Z_TYPE_P(src_zval) != IS_ARRAY ||
        (dest_entry = zend_hash_find_known_hash(dest, string_key)) == NULL ||
        (Z_TYPE_P(dest_entry) != IS_ARRAY &&
         (!Z_ISREF_P(dest_entry) || Z_TYPE_P(Z_REFVAL_P(dest_entry)) != IS_ARRAY))) {

        zval *zv = zend_hash_update(dest, string_key, src_entry);
        zval_add_ref(zv);
        continue;
      }
    } else {
      if (Z_TYPE_P(src_zval) != IS_ARRAY ||
        (dest_entry = zend_hash_index_find(dest, num_key)) == NULL ||
        (Z_TYPE_P(dest_entry) != IS_ARRAY &&
         (!Z_ISREF_P(dest_entry) || Z_TYPE_P(Z_REFVAL_P(dest_entry)) != IS_ARRAY))) {

        zval *zv = zend_hash_index_update(dest, num_key, src_entry);
        zval_add_ref(zv);
        continue;
      }
    }

    dest_zval = dest_entry;
    ZVAL_DEREF(dest_zval);
    if (Z_IS_RECURSIVE_P(dest_zval) ||
      Z_IS_RECURSIVE_P(src_zval) ||
      (Z_ISREF_P(src_entry) && Z_ISREF_P(dest_entry) && Z_REF_P(src_entry) == Z_REF_P(dest_entry) && (Z_REFCOUNT_P(dest_entry) % 2))) {
      zend_throw_error(NULL, "Recursion detected");
      return 0;
    }

    ZEND_ASSERT(!Z_ISREF_P(dest_entry) || Z_REFCOUNT_P(dest_entry) > 1);
    SEPARATE_ZVAL(dest_entry);
    dest_zval = dest_entry;

    if (Z_REFCOUNTED_P(dest_zval)) {
      Z_PROTECT_RECURSION_P(dest_zval);
    }
    if (Z_REFCOUNTED_P(src_zval)) {
      Z_PROTECT_RECURSION_P(src_zval);
    }

    ret = php_array_replace_recursive(Z_ARRVAL_P(dest_zval), Z_ARRVAL_P(src_zval));

    if (Z_REFCOUNTED_P(dest_zval)) {
      Z_UNPROTECT_RECURSION_P(dest_zval);
    }
    if (Z_REFCOUNTED_P(src_zval)) {
      Z_UNPROTECT_RECURSION_P(src_zval);
    }

    if (!ret) {
      return 0;
    }
  } ZEND_HASH_FOREACH_END();

  return 1;
}
/* }}} */

static zend_always_inline void php_array_replace_wrapper(INTERNAL_FUNCTION_PARAMETERS, int recursive) /* {{{ */
{
  zval *args = NULL;
  zval *arg;
  uint32_t argc, i;
  HashTable *dest;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();


  for (i = 0; i < argc; i++) {
    zval *arg = args + i;

    if (Z_TYPE_P(arg) != IS_ARRAY) {
      zend_wrong_parameter_type_error(i + 1, Z_EXPECTED_ARRAY, arg);
      RETURN_THROWS();
    }
  }

  /* copy first array if necessary */
  arg = args;
  bool in_place = zend_may_modify_arg_in_place(arg);
  if (in_place) {
    dest = Z_ARRVAL_P(arg);
  } else {
    dest = zend_array_dup(Z_ARRVAL_P(arg));
  }

  ZVAL_ARR(return_value, dest);

  if (recursive) {
    for (i = 1; i < argc; i++) {
      arg = args + i;
      php_array_replace_recursive(dest, Z_ARRVAL_P(arg));
    }
  } else {
    for (i = 1; i < argc; i++) {
      arg = args + i;
      zend_hash_merge(dest, Z_ARRVAL_P(arg), zval_add_ref, 1);
    }
  }

  if (in_place) {
    GC_ADDREF(dest);
  }
}
/* }}} */

static zend_always_inline void php_array_merge_wrapper(INTERNAL_FUNCTION_PARAMETERS, int recursive) /* {{{ */
{
  zval *args = NULL;
  zval *arg;
  uint32_t argc, i;
  zval *src_entry;
  HashTable *src, *dest;
  uint64_t count = 0;

  ZEND_PARSE_PARAMETERS_START(0, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  if (argc == 0) {
    RETURN_EMPTY_ARRAY();
  }

  for (i = 0; i < argc; i++) {
    zval *arg = args + i;

    if (Z_TYPE_P(arg) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(arg));
      RETURN_THROWS();
    }
    count += zend_hash_num_elements(Z_ARRVAL_P(arg));
  }

  if (UNEXPECTED(count >= HT_MAX_SIZE)) {
    zend_throw_error(NULL, "The total number of elements must be lower than %u", HT_MAX_SIZE);
    RETURN_THROWS();
  }

  if (argc == 2) {
    zval *ret = NULL;

    if (zend_hash_num_elements(Z_ARRVAL(args[0])) == 0) {
      ret = &args[1];
    } else if (zend_hash_num_elements(Z_ARRVAL(args[1])) == 0) {
      ret = &args[0];
    }
    if (ret) {
      if (HT_IS_PACKED(Z_ARRVAL_P(ret))) {
        if (HT_IS_WITHOUT_HOLES(Z_ARRVAL_P(ret))) {
          RETURN_COPY(ret);
        }
      } else {
        bool copy = true;
        zend_string *string_key;

        ZEND_HASH_MAP_FOREACH_STR_KEY(Z_ARRVAL_P(ret), string_key) {
          if (!string_key) {
            copy = false;
            break;
          }
        } ZEND_HASH_FOREACH_END();
        if (copy) {
          RETURN_COPY(ret);
        }
      }
    }
  }

  arg = args;
  src  = Z_ARRVAL_P(arg);
  /* copy first array if necessary */
  bool in_place = false;
  if (HT_IS_PACKED(src)) {
    /* Note: If it has holes, it might get sequentialized */
    if (HT_IS_WITHOUT_HOLES(src) && zend_may_modify_arg_in_place(arg)) {
      dest = src;
      in_place = true;
      RETVAL_ARR(dest);
    } else {
      array_init_size(return_value, count);
      dest = Z_ARRVAL_P(return_value);

      zend_hash_real_init_packed(dest);
      ZEND_HASH_FILL_PACKED(dest) {
        ZEND_HASH_PACKED_FOREACH_VAL(src, src_entry) {
          if (UNEXPECTED(Z_ISREF_P(src_entry) &&
            Z_REFCOUNT_P(src_entry) == 1)) {
            src_entry = Z_REFVAL_P(src_entry);
          }
          Z_TRY_ADDREF_P(src_entry);
          ZEND_HASH_FILL_ADD(src_entry);
        } ZEND_HASH_FOREACH_END();
      } ZEND_HASH_FILL_END();
    }
  } else {
    array_init_size(return_value, count);
    dest = Z_ARRVAL_P(return_value);

    zend_string *string_key;
    zend_hash_real_init_mixed(dest);
    ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(src, string_key, src_entry) {
      if (UNEXPECTED(Z_ISREF_P(src_entry) &&
        Z_REFCOUNT_P(src_entry) == 1)) {
        src_entry = Z_REFVAL_P(src_entry);
      }
      Z_TRY_ADDREF_P(src_entry);
      if (EXPECTED(string_key)) {
        _zend_hash_append(dest, string_key, src_entry);
      } else {
        zend_hash_next_index_insert_new(dest, src_entry);
      }
    } ZEND_HASH_FOREACH_END();
  }
  if (recursive) {
    for (i = 1; i < argc; i++) {
      arg = args + i;
      php_array_merge_recursive(dest, Z_ARRVAL_P(arg));
    }
  } else {
    for (i = 1; i < argc; i++) {
      arg = args + i;
      php_array_merge(dest, Z_ARRVAL_P(arg));
    }
  }

  if (in_place) {
    GC_ADDREF(dest);
  }
}
/* }}} */

/* {{{ Merges elements from passed arrays into one array */
PHP_FUNCTION(array_merge)
{
  php_array_merge_wrapper(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ Recursively merges elements from passed arrays into one array */
PHP_FUNCTION(array_merge_recursive)
{
  php_array_merge_wrapper(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ Replaces elements from passed arrays into one array */
PHP_FUNCTION(array_replace)
{
  php_array_replace_wrapper(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ Recursively replaces elements from passed arrays into one array */
PHP_FUNCTION(array_replace_recursive)
{
  php_array_replace_wrapper(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ Return just the keys from the input array, optionally only for the specified search_value */
PHP_FUNCTION(array_keys)
{
  zval *input,        /* Input array */
       *search_value = NULL, /* Value to search for */
       *entry,        /* An entry in the input array */
         new_val;       /* New value */
  bool strict = 0;    /* do strict comparison */
  zend_ulong num_idx;
  zend_string *str_idx;
  zend_array *arrval;
  zend_ulong elem_count;

  ZEND_PARSE_PARAMETERS_START(1, 3)
    Z_PARAM_ARRAY(input)
    Z_PARAM_OPTIONAL
    Z_PARAM_ZVAL(search_value)
    Z_PARAM_BOOL(strict)
  ZEND_PARSE_PARAMETERS_END();
  arrval = Z_ARRVAL_P(input);
  elem_count = zend_hash_num_elements(arrval);

  /* Base case: empty input */
  if (!elem_count) {
    RETURN_EMPTY_ARRAY();
  }

  /* Initialize return array */
  if (search_value != NULL) {
    array_init(return_value);

    if (strict) {
      ZEND_HASH_FOREACH_KEY_VAL(arrval, num_idx, str_idx, entry) {
        ZVAL_DEREF(entry);
        if (fast_is_identical_function(search_value, entry)) {
          if (str_idx) {
            ZVAL_STR_COPY(&new_val, str_idx);
          } else {
            ZVAL_LONG(&new_val, num_idx);
          }
          zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &new_val);
        }
      } ZEND_HASH_FOREACH_END();
    } else {
      ZEND_HASH_FOREACH_KEY_VAL(arrval, num_idx, str_idx, entry) {
        if (fast_equal_check_function(search_value, entry)) {
          if (str_idx) {
            ZVAL_STR_COPY(&new_val, str_idx);
          } else {
            ZVAL_LONG(&new_val, num_idx);
          }
          zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &new_val);
        }
      } ZEND_HASH_FOREACH_END();
    }
  } else {
    array_init_size(return_value, elem_count);
    zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      if (HT_IS_PACKED(arrval) && HT_IS_WITHOUT_HOLES(arrval)) {
        /* Optimistic case: range(0..n-1) for vector-like packed array */
        zend_ulong lval = 0;

        for (; lval < elem_count; ++lval) {
          ZEND_HASH_FILL_SET_LONG(lval);
          ZEND_HASH_FILL_NEXT();
        }
      } else {
        /* Go through input array and add keys to the return array */
        ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(input), num_idx, str_idx, entry) {
          if (str_idx) {
            ZEND_HASH_FILL_SET_STR_COPY(str_idx);
          } else {
            ZEND_HASH_FILL_SET_LONG(num_idx);
          }
          ZEND_HASH_FILL_NEXT();
        } ZEND_HASH_FOREACH_END();
      }
    } ZEND_HASH_FILL_END();
  }
}
/* }}} */

/* {{{ Get the key of the first element of the array */
PHP_FUNCTION(array_key_first)
{
  zval *stack;    /* Input stack */

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY(stack)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *target_hash = Z_ARRVAL_P (stack);
  HashPosition pos = 0;
  zend_hash_get_current_key_zval_ex(target_hash, return_value, &pos);
}
/* }}} */

/* {{{ Get the key of the last element of the array */
PHP_FUNCTION(array_key_last)
{
  zval *stack;    /* Input stack */
  HashPosition pos;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY(stack)
  ZEND_PARSE_PARAMETERS_END();

  HashTable *target_hash = Z_ARRVAL_P (stack);
  zend_hash_internal_pointer_end_ex(target_hash, &pos);
  zend_hash_get_current_key_zval_ex(target_hash, return_value, &pos);
}
/* }}} */

PHP_FUNCTION(array_first)
{
  HashTable *array;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_HT(array)
  ZEND_PARSE_PARAMETERS_END();

  ZEND_HASH_FOREACH_VAL(array, zval *zv) {
    RETURN_COPY_DEREF(zv);
  } ZEND_HASH_FOREACH_END();
}

PHP_FUNCTION(array_last)
{
  HashTable *array;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_HT(array)
  ZEND_PARSE_PARAMETERS_END();

  ZEND_HASH_REVERSE_FOREACH_VAL(array, zval *zv) {
    RETURN_COPY_DEREF(zv);
  } ZEND_HASH_FOREACH_END();
}

/* {{{ Return just the values from the input array */
PHP_FUNCTION(array_values)
{
  zval   *input;    /* Input array */
  zend_array *arrval;
  zend_long arrlen;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY(input)
  ZEND_PARSE_PARAMETERS_END();

  arrval = Z_ARRVAL_P(input);

  /* Return empty input as is */
  arrlen = zend_hash_num_elements(arrval);
  if (!arrlen) {
    RETURN_EMPTY_ARRAY();
  }

  /* Return vector-like packed arrays as-is */
  if (HT_IS_PACKED(arrval) && HT_IS_WITHOUT_HOLES(arrval) &&
    arrval->nNextFreeElement == arrlen) {
    RETURN_COPY(input);
  }

  RETURN_ARR(zend_array_to_list(arrval));
}
/* }}} */

/* {{{ Return the value as key and the frequency of that value in input as value */
PHP_FUNCTION(array_count_values)
{
  zval  *input,   /* Input array */
      *entry,   /* An entry in the input array */
      *tmp;
  HashTable *myht;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY(input)
  ZEND_PARSE_PARAMETERS_END();

  /* Initialize return array */
  array_init(return_value);

  /* Go through input array and add values to the return array */
  myht = Z_ARRVAL_P(input);
  ZEND_HASH_FOREACH_VAL(myht, entry) {
    ZVAL_DEREF(entry);
    if (Z_TYPE_P(entry) == IS_LONG) {
      if ((tmp = zend_hash_index_find(Z_ARRVAL_P(return_value), Z_LVAL_P(entry))) == NULL) {
        zval data;
        ZVAL_LONG(&data, 1);
        zend_hash_index_add_new(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), &data);
      } else {
        Z_LVAL_P(tmp)++;
      }
    } else if (Z_TYPE_P(entry) == IS_STRING) {
      if ((tmp = zend_symtable_find(Z_ARRVAL_P(return_value), Z_STR_P(entry))) == NULL) {
        zval data;
        ZVAL_LONG(&data, 1);
        zend_symtable_add_new(Z_ARRVAL_P(return_value), Z_STR_P(entry), &data);
      } else {
        Z_LVAL_P(tmp)++;
      }
    } else {
      php_error_docref(NULL, E_WARNING, "Can only count string and integer values, entry skipped");
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

static inline zval *array_column_fetch_prop(zval *data, zend_string *name_str, zend_long name_long, bool is_string_key, void **cache_slot, zval *rv) /* {{{ */
{
  zval *prop = NULL;

  if (Z_TYPE_P(data) == IS_OBJECT) {
    zend_string *tmp_str;
    /* If name is an integer convert integer to string */
    if (name_str == NULL) {
      tmp_str = zend_long_to_str(name_long);
    } else {
      tmp_str = zend_string_copy(name_str);
    }
    /* The has_property check is first performed in "exists" mode (which returns true for
     * properties that are null but exist) and then in "has" mode to handle objects that
     * implement __isset (which is not called in "exists" mode). */
    if (Z_OBJ_HANDLER_P(data, has_property)(Z_OBJ_P(data), tmp_str, ZEND_PROPERTY_EXISTS, cache_slot)
        || Z_OBJ_HANDLER_P(data, has_property)(Z_OBJ_P(data), tmp_str, ZEND_PROPERTY_ISSET, cache_slot)) {
      prop = Z_OBJ_HANDLER_P(data, read_property)(Z_OBJ_P(data), tmp_str, BP_VAR_R, cache_slot, rv);
      if (prop) {
        ZVAL_DEREF(prop);
        if (prop != rv) {
          Z_TRY_ADDREF_P(prop);
        }
      }
    }
    zend_string_release(tmp_str);
  } else if (Z_TYPE_P(data) == IS_ARRAY) {
    if (is_string_key) {
      prop = zend_hash_find(Z_ARRVAL_P(data), name_str);
    } else {
      prop = zend_hash_index_find(Z_ARRVAL_P(data), name_long);
    }
    if (prop) {
      ZVAL_DEREF(prop);
      Z_TRY_ADDREF_P(prop);
    }
  }

  return prop;
}
/* }}} */

/* {{{ Return the values from a single column in the input array, identified by the
   value_key and optionally indexed by the index_key */
PHP_FUNCTION(array_column)
{
  HashTable *input;
  zval *colval, *data, rv;
  zend_string *column_str = NULL;
  zend_long column_long = 0;
  bool column_is_null = 0;
  zend_string *index_str = NULL;
  zend_long index_long = 0;
  bool index_is_null = 1;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ARRAY_HT(input)
    Z_PARAM_STR_OR_LONG_OR_NULL(column_str, column_long, column_is_null)
    Z_PARAM_OPTIONAL
    Z_PARAM_STR_OR_LONG_OR_NULL(index_str, index_long, index_is_null)
  ZEND_PARSE_PARAMETERS_END();

  uint32_t num_elements = zend_hash_num_elements(input);
  if (num_elements == 0) {
    RETURN_EMPTY_ARRAY();
  }

  if (column_is_null && index_is_null) {
    array_init_size(return_value, num_elements);
    zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      ZEND_HASH_FOREACH_VAL(input, data) {
        ZVAL_DEREF(data);
        Z_TRY_ADDREF_P(data);
        ZEND_HASH_FILL_ADD(data);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();
    return;
  }

  /* Normalize array keys once, retaining the original names for object properties. */
  zend_ulong column_index = (zend_ulong) column_long;
  bool column_is_string_key = column_str && !ZEND_HANDLE_NUMERIC(column_str, column_index);
  column_long = (zend_long) column_index;
  void *cache_slot_column[3] = { NULL, NULL, NULL };

  /* Index param is not passed */
  if (index_is_null) {
    array_init_size(return_value, num_elements);
    zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      ZEND_HASH_FOREACH_VAL(input, data) {
        ZVAL_DEREF(data);
        if ((colval = array_column_fetch_prop(data, column_str, column_long, column_is_string_key, cache_slot_column, &rv)) == NULL) {
          continue;
        }
        ZEND_HASH_FILL_ADD(colval);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();
  } else {
    zend_ulong index = (zend_ulong) index_long;
    bool index_is_string_key = index_str && !ZEND_HANDLE_NUMERIC(index_str, index);
    index_long = (zend_long) index;
    void *cache_slot_index[3] = { NULL, NULL, NULL };

    array_init_size(return_value, num_elements);
    ZEND_HASH_FOREACH_VAL(input, data) {
      ZVAL_DEREF(data);

      if (column_is_null) {
        Z_TRY_ADDREF_P(data);
        colval = data;
      } else if ((colval = array_column_fetch_prop(data, column_str, column_long, column_is_string_key, cache_slot_column, &rv)) == NULL) {
        continue;
      }

      zval rv;
      zval *keyval = array_column_fetch_prop(data, index_str, index_long, index_is_string_key, cache_slot_index, &rv);
      if (keyval) {
        array_set_zval_key(Z_ARRVAL_P(return_value), keyval, colval);
        zval_ptr_dtor(colval);
        zval_ptr_dtor(keyval);
      } else {
        zend_hash_next_index_insert(Z_ARRVAL_P(return_value), colval);
      }
    } ZEND_HASH_FOREACH_END();
  }
}
/* }}} */

/* {{{ Return input as a new array with the order of the entries reversed */
PHP_FUNCTION(array_reverse)
{
  zval   *input,        /* Input array */
       *entry;        /* An entry in the input array */
  zend_string *string_key;
  zend_ulong    num_key;
  bool preserve_keys = 0; /* whether to preserve keys */

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ARRAY(input)
    Z_PARAM_OPTIONAL
    Z_PARAM_BOOL(preserve_keys)
  ZEND_PARSE_PARAMETERS_END();

  /* Initialize return array */
  array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(input)));
  if (HT_IS_PACKED(Z_ARRVAL_P(input)) && !preserve_keys) {
    zend_hash_real_init_packed(Z_ARRVAL_P(return_value));
    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      ZEND_HASH_PACKED_REVERSE_FOREACH_VAL(Z_ARRVAL_P(input), entry) {
        if (UNEXPECTED(Z_ISREF_P(entry) &&
          Z_REFCOUNT_P(entry) == 1)) {
          entry = Z_REFVAL_P(entry);
        }
        Z_TRY_ADDREF_P(entry);
        ZEND_HASH_FILL_ADD(entry);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();
  } else {
    ZEND_HASH_REVERSE_FOREACH_KEY_VAL(Z_ARRVAL_P(input), num_key, string_key, entry) {
      if (string_key) {
        entry = zend_hash_add_new(Z_ARRVAL_P(return_value), string_key, entry);
      } else {
        if (preserve_keys) {
          entry = zend_hash_index_add_new(Z_ARRVAL_P(return_value), num_key, entry);
        } else {
          entry = zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), entry);
        }
      }
      zval_add_ref(entry);
    } ZEND_HASH_FOREACH_END();
  }
}
/* }}} */

/* Releases references taken up-front for pad values that were not inserted. */
static zend_always_inline void php_array_pad_release(zval *pad_value, zend_long num_pads)
{
  if (Z_REFCOUNTED_P(pad_value)) {
    GC_DELREF_EX(Z_COUNTED_P(pad_value), num_pads);
  }
}

/* {{{ Returns a copy of input array padded with pad_value to size pad_size */
PHP_FUNCTION(array_pad)
{
  zval  *input;   /* Input array */
  zval  *pad_value; /* Padding value obviously */
  zend_long pad_size;   /* Size to pad to */
  zend_long pad_size_abs; /* Absolute value of pad_size */
  zend_long input_size;   /* Size of the input array */
  zend_long num_pads;   /* How many pads do we need */
  zend_long i;
  zend_string *key;
  zval *value;

  ZEND_PARSE_PARAMETERS_START(3, 3)
    Z_PARAM_ARRAY(input)
    Z_PARAM_LONG(pad_size)
    Z_PARAM_ZVAL(pad_value)
  ZEND_PARSE_PARAMETERS_END();

  if (pad_size < Z_L(-HT_MAX_SIZE) || pad_size > Z_L(HT_MAX_SIZE)) {
    zend_argument_value_error(2, "must not exceed the maximum allowed array size");
    RETURN_THROWS();
  }

  /* Do some initial calculations */
  input_size = zend_hash_num_elements(Z_ARRVAL_P(input));
  pad_size_abs = ZEND_ABS(pad_size);

  if (input_size >= pad_size_abs) {
    /* Copy the original array */
    ZVAL_COPY(return_value, input);
    return;
  }

  num_pads = pad_size_abs - input_size;
  if (Z_REFCOUNTED_P(pad_value)) {
    GC_ADDREF_EX(Z_COUNTED_P(pad_value), num_pads);
  }

  array_init_size(return_value, pad_size_abs);
  if (HT_IS_PACKED(Z_ARRVAL_P(input))) {
    if (UNEXPECTED(zend_hash_real_finit_packed(Z_ARRVAL_P(return_value), /* fallible */ true) == FAILURE)) {
      php_array_pad_release(pad_value, num_pads);
      RETURN_OOM();
    }

    if (pad_size < 0) {
      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0; i < num_pads; i++) {
          ZEND_HASH_FILL_ADD(pad_value);
        }
      } ZEND_HASH_FILL_END();
    }

    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      ZEND_HASH_PACKED_FOREACH_VAL(Z_ARRVAL_P(input), value) {
        Z_TRY_ADDREF_P(value);
        ZEND_HASH_FILL_ADD(value);
      } ZEND_HASH_FOREACH_END();
    } ZEND_HASH_FILL_END();

    if (pad_size > 0) {
      ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
        for (i = 0; i < num_pads; i++) {
          ZEND_HASH_FILL_ADD(pad_value);
        }
      } ZEND_HASH_FILL_END();
    }
  } else {
    if (pad_size < 0) {
      for (i = 0; i < num_pads; i++) {
        if (UNEXPECTED(zend_hash_next_index_finsert_new(Z_ARRVAL_P(return_value), pad_value) == HASH_NOMEM)) {
          php_array_pad_release(pad_value, num_pads - i);
          RETURN_OOM();
        }
      }
    }

    ZEND_HASH_MAP_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(input), key, value) {
      Z_TRY_ADDREF_P(value);
      zval *result;
      if (key) {
        result = zend_hash_fadd_new(Z_ARRVAL_P(return_value), key, value);
      } else {
        result = zend_hash_next_index_finsert_new(Z_ARRVAL_P(return_value), value);
      }
      if (UNEXPECTED(result == HASH_NOMEM)) {
        Z_TRY_DELREF_P(value);
        if (pad_size > 0) {
          php_array_pad_release(pad_value, num_pads);
        }
        RETURN_OOM();
      }
    } ZEND_HASH_FOREACH_END();

    if (pad_size > 0) {
      for (i = 0; i < num_pads; i++) {
        if (UNEXPECTED(zend_hash_next_index_finsert_new(Z_ARRVAL_P(return_value), pad_value) == HASH_NOMEM)) {
          php_array_pad_release(pad_value, num_pads - i);
          RETURN_OOM();
        }
      }
    }
  }
}
/* }}} */

/* {{{ Return array with key <-> value flipped */
PHP_FUNCTION(array_flip)
{
  zval *array, *entry, data;
  zend_ulong num_idx;
  zend_string *str_idx;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY(array)
  ZEND_PARSE_PARAMETERS_END();

  array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(array)));

  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
    ZVAL_DEREF(entry);
    if (Z_TYPE_P(entry) == IS_LONG) {
      if (str_idx) {
        ZVAL_STR_COPY(&data, str_idx);
      } else {
        ZVAL_LONG(&data, num_idx);
      }
      zend_hash_index_update(Z_ARRVAL_P(return_value), Z_LVAL_P(entry), &data);
    } else if (Z_TYPE_P(entry) == IS_STRING) {
      if (str_idx) {
        ZVAL_STR_COPY(&data, str_idx);
      } else {
        ZVAL_LONG(&data, num_idx);
      }
      zend_symtable_update(Z_ARRVAL_P(return_value), Z_STR_P(entry), &data);
    } else {
      php_error_docref(NULL, E_WARNING, "Can only flip string and integer values, entry skipped");
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* {{{ Returns an array with all string keys lowercased [or uppercased] */
PHP_FUNCTION(array_change_key_case)
{
  zval *array, *entry;
  zend_string *string_key;
  zend_string *new_key;
  zend_ulong num_key;
  zend_long change_to_upper = PHP_CASE_LOWER;

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ARRAY(array)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(change_to_upper)
  ZEND_PARSE_PARAMETERS_END();

  if (change_to_upper != PHP_CASE_LOWER && change_to_upper != PHP_CASE_UPPER) {
    zend_argument_value_error(2, "must be either CASE_LOWER or CASE_UPPER");
    RETURN_THROWS();
  }

  array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL_P(array)));

  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_key, string_key, entry) {
    if (!string_key) {
      entry = zend_hash_index_add_new(Z_ARRVAL_P(return_value), num_key, entry);
    } else {
      if (change_to_upper == PHP_CASE_UPPER) {
        new_key = zend_string_toupper(string_key);
      } else {
        new_key = zend_string_tolower(string_key);
      }
      entry = zend_hash_update(Z_ARRVAL_P(return_value), new_key, entry);
      zend_string_release_ex(new_key, 0);
    }

    zval_add_ref(entry);
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

struct bucketindex {
  Bucket b;
  unsigned int i;
};

static void array_bucketindex_swap(void *p, void *q)
{
  struct bucketindex *f = (struct bucketindex *)p;
  struct bucketindex *g = (struct bucketindex *)q;
  struct bucketindex t;
  t = *f;
  *f = *g;
  *g = t;
}

/* {{{ Removes duplicate values from array */
PHP_FUNCTION(array_unique)
{
  zval *array;
  Bucket *p;
  zend_long sort_type = PHP_SORT_STRING;
  bucket_compare_func_t cmp;
  struct bucketindex *arTmp, *cmpdata, *lastkept;
  uint32_t i, idx;

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ARRAY(array)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(sort_type)
  ZEND_PARSE_PARAMETERS_END();

  if (Z_ARRVAL_P(array)->nNumOfElements <= 1) { /* nothing to do */
    ZVAL_COPY(return_value, array);
    return;
  }

  if (sort_type == PHP_SORT_STRING) {
    HashTable seen;
    zend_long num_key;
    zend_string *str_key;
    zval *val;

    zend_hash_init(&seen, zend_hash_num_elements(Z_ARRVAL_P(array)), NULL, NULL, 0);
    array_init(return_value);

    ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_key, str_key, val) {
      zval *retval;
      if (Z_TYPE_P(val) == IS_STRING) {
        retval = zend_hash_add_empty_element(&seen, Z_STR_P(val));
      } else {
        zend_string *tmp_str_val;
        zend_string *str_val = zval_get_tmp_string(val, &tmp_str_val);
        retval = zend_hash_add_empty_element(&seen, str_val);
        zend_tmp_string_release(tmp_str_val);
      }

      if (retval) {
        /* First occurrence of the value */
        if (UNEXPECTED(Z_ISREF_P(val) && Z_REFCOUNT_P(val) == 1)) {
          ZVAL_DEREF(val);
        }
        Z_TRY_ADDREF_P(val);

        if (str_key) {
          zend_hash_add_new(Z_ARRVAL_P(return_value), str_key, val);
        } else {
          zend_hash_index_add_new(Z_ARRVAL_P(return_value), num_key, val);
        }
      }
    } ZEND_HASH_FOREACH_END();

    zend_hash_destroy(&seen);
    return;
  }

  cmp = php_get_data_compare_func_unstable(sort_type, false);

  bool in_place = zend_may_modify_arg_in_place(array);
  if (in_place) {
    RETVAL_ARR(Z_ARRVAL_P(array));
  } else {
    RETVAL_ARR(zend_array_dup(Z_ARRVAL_P(array)));
  }

  /* create and sort array with pointers to the target_hash buckets */
  arTmp = pemalloc((Z_ARRVAL_P(array)->nNumOfElements + 1) * sizeof(struct bucketindex), GC_FLAGS(Z_ARRVAL_P(array)) & IS_ARRAY_PERSISTENT);
  if (HT_IS_PACKED(Z_ARRVAL_P(array))) {
    zval *zv = Z_ARRVAL_P(array)->arPacked;
    for (i = 0, idx = 0; idx < Z_ARRVAL_P(array)->nNumUsed; idx++, zv++) {
      if (Z_TYPE_P(zv) == IS_UNDEF) continue;
      ZVAL_COPY_VALUE(&arTmp[i].b.val, zv);
      arTmp[i].b.h = idx;
      arTmp[i].b.key = NULL;
      arTmp[i].i = i;
      i++;
    }
  } else {
    p = Z_ARRVAL_P(array)->arData;
    for (i = 0, idx = 0; idx < Z_ARRVAL_P(array)->nNumUsed; idx++, p++) {
      if (Z_TYPE(p->val) == IS_UNDEF) continue;
      arTmp[i].b = *p;
      arTmp[i].i = i;
      i++;
    }
  }
  ZVAL_UNDEF(&arTmp[i].b.val);
  zend_sort((void *) arTmp, i, sizeof(struct bucketindex),
      (compare_func_t) cmp, (swap_func_t) array_bucketindex_swap);

  if (UNEXPECTED(EG(exception))) {
    goto out;
  }

  /* go through the sorted array and delete duplicates from the copy */
  lastkept = arTmp;
  for (cmpdata = arTmp + 1; Z_TYPE(cmpdata->b.val) != IS_UNDEF; cmpdata++) {
    if (cmp(&lastkept->b, &cmpdata->b)) {
      lastkept = cmpdata;
    } else {
      if (lastkept->i > cmpdata->i) {
        p = &lastkept->b;
        lastkept = cmpdata;
      } else {
        p = &cmpdata->b;
      }
      if (p->key == NULL) {
        zend_hash_index_del(Z_ARRVAL_P(return_value), p->h);
      } else {
        zend_hash_del(Z_ARRVAL_P(return_value), p->key);
      }
    }
  }

out:
  pefree(arTmp, GC_FLAGS(Z_ARRVAL_P(array)) & IS_ARRAY_PERSISTENT);

  if (in_place) {
    Z_ADDREF_P(return_value);
  }
}
/* }}} */

static int zval_compare(zval *first, zval *second) /* {{{ */
{
  return string_compare_function(first, second);
}
/* }}} */

static int zval_user_compare(zval *a, zval *b) /* {{{ */
{
  zval args[2];
  zval retval;

  ZVAL_COPY_VALUE(&args[0], a);
  ZVAL_COPY_VALUE(&args[1], b);

  BG(user_compare_fci).param_count = 2;
  BG(user_compare_fci).params = args;
  BG(user_compare_fci).retval = &retval;

  zend_call_function(&BG(user_compare_fci), &BG(user_compare_fci_cache));
  zend_long ret = php_get_long(&retval);
  return ZEND_NORMALIZE_BOOL(ret);
}
/* }}} */

static void php_array_intersect_key(INTERNAL_FUNCTION_PARAMETERS, int data_compare_type) /* {{{ */
{
  uint32_t argc, i;
  zval *args;
  int (*intersect_data_compare_func)(zval *, zval *) = NULL;
  bool ok;
  zval *val, *data;
  char *param_spec;
  zend_string *key;
  zend_ulong h;

  /* Get the argument count */
  argc = ZEND_NUM_ARGS();
  if (data_compare_type == INTERSECT_COMP_DATA_USER) {
    /* INTERSECT_COMP_DATA_USER - array_uintersect_assoc() */
    param_spec = "+f";
    intersect_data_compare_func = zval_user_compare;
  } else {
    /*  INTERSECT_COMP_DATA_NONE - array_intersect_key()
      INTERSECT_COMP_DATA_INTERNAL - array_intersect_assoc() */
    param_spec = "+";

    if (data_compare_type == INTERSECT_COMP_DATA_INTERNAL) {
      intersect_data_compare_func = zval_compare;
    }
  }

  if (zend_parse_parameters(ZEND_NUM_ARGS(), param_spec, &args, &argc, &BG(user_compare_fci), &BG(user_compare_fci_cache)) == FAILURE) {
    RETURN_THROWS();
  }

  for (i = 0; i < argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      RETURN_THROWS();
    }
  }

  array_init(return_value);

  /* Iterate over keys of the first array, to compute keys that are in all of the other arrays. */
  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL(args[0]), h, key, val) {
    if (Z_ISREF_P(val) && Z_REFCOUNT_P(val) == 1) {
      val = Z_REFVAL_P(val);
    }
    if (key == NULL) {
      ok = true;
      for (i = 1; i < argc; i++) {
        if ((data = zend_hash_index_find(Z_ARRVAL(args[i]), h)) == NULL ||
          (intersect_data_compare_func &&
          intersect_data_compare_func(val, data) != 0)
        ) {
          ok = false;
          break;
        }
      }
      if (ok) {
        Z_TRY_ADDREF_P(val);
        zend_hash_index_add_new(Z_ARRVAL_P(return_value), h, val);
      }
    } else {
      ok = true;
      for (i = 1; i < argc; i++) {
        if ((data = zend_hash_find_known_hash(Z_ARRVAL(args[i]), key)) == NULL ||
          (intersect_data_compare_func &&
          intersect_data_compare_func(val, data) != 0)
        ) {
          ok = false;
          break;
        }
      }
      if (ok) {
        Z_TRY_ADDREF_P(val);
        zend_hash_add_new(Z_ARRVAL_P(return_value), key, val);
      }
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

static void php_array_intersect(INTERNAL_FUNCTION_PARAMETERS, int behavior, int data_compare_type, int key_compare_type) /* {{{ */
{
  zval *args = NULL;
  HashTable *hash;
  uint32_t arr_argc, i;
  int c = 0;
  uint32_t idx;
  Bucket **lists, *list, **ptrs, *p;
  char *param_spec;
  zend_fcall_info fci1, fci2;
  zend_fcall_info_cache fci1_cache = empty_fcall_info_cache, fci2_cache = empty_fcall_info_cache;
  zend_fcall_info *fci_key = NULL, *fci_data;
  zend_fcall_info_cache *fci_key_cache = NULL, *fci_data_cache;
  PHP_ARRAY_CMP_FUNC_VARS;
  bool in_place = false;

  bucket_compare_func_t intersect_key_compare_func;
  bucket_compare_func_t intersect_data_compare_func;

  if (behavior == INTERSECT_NORMAL) {
    intersect_key_compare_func = php_array_key_compare_string;

    if (data_compare_type == INTERSECT_COMP_DATA_INTERNAL) {
      /* array_intersect() */
      param_spec = "+";
      intersect_data_compare_func = php_array_data_compare_string_unstable;
    } else if (data_compare_type == INTERSECT_COMP_DATA_USER) {
      /* array_uintersect() */
      param_spec = "+f";
      intersect_data_compare_func = php_array_user_compare_unstable;
    } else {
      ZEND_ASSERT(0 && "Invalid data_compare_type");
      return;
    }

    if (zend_parse_parameters(ZEND_NUM_ARGS(), param_spec, &args, &arr_argc, &fci1, &fci1_cache) == FAILURE) {
      RETURN_THROWS();
    }
    fci_data = &fci1;
    fci_data_cache = &fci1_cache;

  } else if (behavior & INTERSECT_ASSOC) { /* triggered also when INTERSECT_KEY */
    /* INTERSECT_KEY is subset of INTERSECT_ASSOC. When having the former
     * no comparison of the data is done (part of INTERSECT_ASSOC) */

    if (data_compare_type == INTERSECT_COMP_DATA_INTERNAL && key_compare_type == INTERSECT_COMP_KEY_INTERNAL) {
      /* array_intersect_assoc() or array_intersect_key() */
      param_spec = "+";
      intersect_key_compare_func = php_array_key_compare_string_unstable;
      intersect_data_compare_func = php_array_data_compare_string_unstable;
    } else if (data_compare_type == INTERSECT_COMP_DATA_USER && key_compare_type == INTERSECT_COMP_KEY_INTERNAL) {
      /* array_uintersect_assoc() */
      param_spec = "+f";
      intersect_key_compare_func = php_array_key_compare_string_unstable;
      intersect_data_compare_func = php_array_user_compare_unstable;
      fci_data = &fci1;
      fci_data_cache = &fci1_cache;
    } else if (data_compare_type == INTERSECT_COMP_DATA_INTERNAL && key_compare_type == INTERSECT_COMP_KEY_USER) {
      /* array_intersect_uassoc() or array_intersect_ukey() */
      param_spec = "+f";
      intersect_key_compare_func = php_array_user_key_compare_unstable;
      intersect_data_compare_func = php_array_data_compare_string_unstable;
      fci_key = &fci1;
      fci_key_cache = &fci1_cache;
    } else if (data_compare_type == INTERSECT_COMP_DATA_USER && key_compare_type == INTERSECT_COMP_KEY_USER) {
      /* array_uintersect_uassoc() */
      param_spec = "+ff";
      intersect_key_compare_func = php_array_user_key_compare_unstable;
      intersect_data_compare_func = php_array_user_compare_unstable;
      fci_data = &fci1;
      fci_data_cache = &fci1_cache;
      fci_key = &fci2;
      fci_key_cache = &fci2_cache;
    } else {
      ZEND_ASSERT(0 && "Invalid data_compare_type / key_compare_type");
      return;
    }

    if (zend_parse_parameters(ZEND_NUM_ARGS(), param_spec, &args, &arr_argc, &fci1, &fci1_cache, &fci2, &fci2_cache) == FAILURE) {
      RETURN_THROWS();
    }

  } else {
    ZEND_ASSERT(0 && "Invalid behavior");
    return;
  }

  PHP_ARRAY_CMP_FUNC_BACKUP();

  /* for each argument, create and sort list with pointers to the hash buckets */
  lists = (Bucket **)safe_emalloc(arr_argc, sizeof(Bucket *), 0);
  ptrs = (Bucket **)safe_emalloc(arr_argc, sizeof(Bucket *), 0);

  if (behavior == INTERSECT_NORMAL && data_compare_type == INTERSECT_COMP_DATA_USER) {
    BG(user_compare_fci) = *fci_data;
    BG(user_compare_fci_cache) = *fci_data_cache;
  } else if ((behavior & INTERSECT_ASSOC) && key_compare_type == INTERSECT_COMP_KEY_USER) {
    BG(user_compare_fci) = *fci_key;
    BG(user_compare_fci_cache) = *fci_key_cache;
  }

  for (i = 0; i < arr_argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      arr_argc = i; /* only free up to i - 1 */
      goto out;
    }
    hash = Z_ARRVAL(args[i]);
    list = (Bucket *) pemalloc((hash->nNumOfElements + 1) * sizeof(Bucket), GC_FLAGS(hash) & IS_ARRAY_PERSISTENT);
    lists[i] = list;
    ptrs[i] = list;
    if (HT_IS_PACKED(hash)) {
      zval *zv = hash->arPacked;
      for (idx = 0; idx < hash->nNumUsed; idx++, zv++) {
        if (Z_TYPE_P(zv) == IS_UNDEF) continue;
        ZVAL_COPY_VALUE(&list->val, zv);
        list->h = idx;
        list->key = NULL;
        list++;
      }
    } else {
      p = hash->arData;
      for (idx = 0; idx < hash->nNumUsed; idx++, p++) {
        if (Z_TYPE(p->val) == IS_UNDEF) continue;
        *list++ = *p;
      }
    }
    ZVAL_UNDEF(&list->val);
    if (hash->nNumOfElements > 1) {
      if (behavior == INTERSECT_NORMAL) {
        zend_sort((void *) lists[i], hash->nNumOfElements,
            sizeof(Bucket), (compare_func_t) intersect_data_compare_func,
            (swap_func_t)zend_hash_bucket_swap);
      } else if (behavior & INTERSECT_ASSOC) { /* triggered also when INTERSECT_KEY */
        zend_sort((void *) lists[i], hash->nNumOfElements,
            sizeof(Bucket), (compare_func_t) intersect_key_compare_func,
            (swap_func_t)zend_hash_bucket_swap);
      }
    }
  }

  /* copy the argument array if necessary */
  in_place = zend_may_modify_arg_in_place(&args[0]);
  if (in_place) {
    RETVAL_ARR(Z_ARRVAL_P(&args[0]));
  } else {
    RETVAL_ARR(zend_array_dup(Z_ARRVAL_P(&args[0])));
  }

  /* go through the lists and look for common values */
  while (Z_TYPE(ptrs[0]->val) != IS_UNDEF) {
    if ((behavior & INTERSECT_ASSOC) /* triggered also when INTERSECT_KEY */
      && key_compare_type == INTERSECT_COMP_KEY_USER) {
      BG(user_compare_fci) = *fci_key;
      BG(user_compare_fci_cache) = *fci_key_cache;
    }

    for (i = 1; i < arr_argc; i++) {
      if (behavior & INTERSECT_NORMAL) {
        while (Z_TYPE(ptrs[i]->val) != IS_UNDEF && (0 < (c = intersect_data_compare_func(ptrs[0], ptrs[i])))) {
          ptrs[i]++;
        }
      } else if (behavior & INTERSECT_ASSOC) { /* triggered also when INTERSECT_KEY */
        while (Z_TYPE(ptrs[i]->val) != IS_UNDEF && (0 < (c = intersect_key_compare_func(ptrs[0], ptrs[i])))) {
          ptrs[i]++;
        }
        if ((!c && Z_TYPE(ptrs[i]->val) != IS_UNDEF) && (behavior == INTERSECT_ASSOC)) { /* only when INTERSECT_ASSOC */
          /* this means that ptrs[i] is not NULL so we can compare
           * and "c==0" is from last operation
           * in this branch of code we enter only when INTERSECT_ASSOC
           * since when we have INTERSECT_KEY compare of data is not wanted. */
          if (data_compare_type == INTERSECT_COMP_DATA_USER) {
            BG(user_compare_fci) = *fci_data;
            BG(user_compare_fci_cache) = *fci_data_cache;
          }
          if (intersect_data_compare_func(ptrs[0], ptrs[i]) != 0) {
            c = 1;
            if (key_compare_type == INTERSECT_COMP_KEY_USER) {
              BG(user_compare_fci) = *fci_key;
              BG(user_compare_fci_cache) = *fci_key_cache;
              /* When KEY_USER, the last parameter is always the callback */
            }
            /* we are going to the break */
          } else {
            /* continue looping */
          }
        }
      }
      if (Z_TYPE(ptrs[i]->val) == IS_UNDEF) {
        /* delete any values corresponding to remains of ptrs[0] */
        /* and exit because they do not present in at least one of */
        /* the other arguments */
        for (;;) {
          p = ptrs[0]++;
          if (Z_TYPE(p->val) == IS_UNDEF) {
            goto out;
          }
          if (p->key == NULL) {
            zend_hash_index_del(Z_ARRVAL_P(return_value), p->h);
          } else {
            zend_hash_del(Z_ARRVAL_P(return_value), p->key);
          }
        }
      }
      if (c) /* here we get if not all are equal */
        break;
      ptrs[i]++;
    }
    if (c) {
      /* Value of ptrs[0] not in all arguments, delete all entries */
      /* with value < value of ptrs[i] */
      for (;;) {
        p = ptrs[0];
        if (p->key == NULL) {
          zend_hash_index_del(Z_ARRVAL_P(return_value), p->h);
        } else {
          zend_hash_del(Z_ARRVAL_P(return_value), p->key);
        }
        if (Z_TYPE((++ptrs[0])->val) == IS_UNDEF) {
          goto out;
        }
        if (behavior == INTERSECT_NORMAL) {
          if (0 <= intersect_data_compare_func(ptrs[0], ptrs[i])) {
            break;
          }
        } else if (behavior & INTERSECT_ASSOC) { /* triggered also when INTERSECT_KEY */
          /* no need of looping because indexes are unique */
          break;
        }
      }
    } else {
      /* ptrs[0] is present in all the arguments */
      /* Skip all entries with same value as ptrs[0] */
      for (;;) {
        if (Z_TYPE((++ptrs[0])->val) == IS_UNDEF) {
          goto out;
        }
        if (behavior == INTERSECT_NORMAL) {
          if (intersect_data_compare_func(ptrs[0] - 1, ptrs[0])) {
            break;
          }
        } else if (behavior & INTERSECT_ASSOC) { /* triggered also when INTERSECT_KEY */
          /* no need of looping because indexes are unique */
          break;
        }
      }
    }
  }
out:
  for (i = 0; i < arr_argc; i++) {
    hash = Z_ARRVAL(args[i]);
    pefree(lists[i], GC_FLAGS(hash) & IS_ARRAY_PERSISTENT);
  }

  PHP_ARRAY_CMP_FUNC_RESTORE();

  efree(ptrs);
  efree(lists);

  if (in_place) {
    Z_ADDREF_P(return_value);
  }
}
/* }}} */

/* {{{ Returns the entries of arr1 that have keys which are present in all the other arguments. Kind of equivalent to array_diff(array_keys($arr1), array_keys($arr2)[,array_keys(...)]). Equivalent of array_intersect_assoc() but does not do compare of the data. */
PHP_FUNCTION(array_intersect_key)
{
  php_array_intersect_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_COMP_DATA_NONE);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have keys which are present in all the other arguments. Kind of equivalent to array_diff(array_keys($arr1), array_keys($arr2)[,array_keys(...)]). The comparison of the keys is performed by a user supplied function. Equivalent of array_intersect_uassoc() but does not do compare of the data. */
PHP_FUNCTION(array_intersect_ukey)
{
  php_array_intersect(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_KEY, INTERSECT_COMP_DATA_INTERNAL, INTERSECT_COMP_KEY_USER);
}
/* }}} */

static zend_always_inline bool php_array_intersect_get_key(
    zval *value, zend_ulong *num_key, zend_string **str_key, zend_string **tmp_key)
{
  ZVAL_DEREF(value);
  *tmp_key = NULL;

  if (Z_TYPE_P(value) == IS_LONG) {
    *num_key = (zend_ulong) Z_LVAL_P(value);
    *str_key = NULL;
    return true;
  }

  if (Z_TYPE_P(value) == IS_STRING) {
    *str_key = Z_STR_P(value);
    return true;
  }

  *str_key = zval_try_get_tmp_string(value, tmp_key);
  return *str_key != NULL;
}

static zend_always_inline void php_array_intersect_empty_result(zval *first, zval *return_value)
{
  HashTable *result;
  bool in_place = zend_may_modify_arg_in_place(first);

  if (in_place) {
    result = Z_ARRVAL_P(first);
    ZVAL_ARR(return_value, result);
  } else {
    result = zend_array_dup(Z_ARRVAL_P(first));
    ZVAL_ARR(return_value, result);
  }

  ZEND_HASH_FOREACH_KEY(result, zend_ulong num_key, zend_string *key) {
    if (key) {
      zend_hash_del(result, key);
    } else {
      zend_hash_index_del(result, num_key);
    }
  } ZEND_HASH_FOREACH_END();

  if (in_place) {
    Z_ADDREF_P(return_value);
  }
}

/* {{{ Hash-based implementation of array_intersect(). Values are compared
 * using their string representation. On the long|string domain, this is
 * exactly key equality under symtable normalization: a long and a string
 * compare equal iff the string is the canonical decimal representation of the
 * long, which is precisely when ZEND_HANDLE_NUMERIC converts it to that long
 * key. Other values are converted to string before the same normalization. */
static zend_never_inline void php_array_intersect_hash(zval *args, uint32_t argc, zval *return_value)
{
  for (uint32_t i = 0; i < argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      return;
    }
  }

  /* An empty argument makes the intersection empty, so no values need to be
   * converted to string. */
  for (uint32_t i = 0; i < argc; i++) {
    if (zend_hash_num_elements(Z_ARRVAL(args[i])) == 0) {
      php_array_intersect_empty_result(&args[0], return_value);
      return;
    }
  }

  /* Map each value of args[1] to the number of consecutive arguments,
   * starting from args[1], the value has been seen in. */
  zval one;
  ZVAL_LONG(&one, 1);
  HashTable set;
  zend_hash_init(&set, zend_hash_num_elements(Z_ARRVAL(args[1])), NULL, NULL, 0);
  zend_bitset delete_bitset = NULL;
  ALLOCA_FLAG(use_heap);
  bool in_place = false;

  ZEND_HASH_FOREACH_VAL(Z_ARRVAL(args[1]), zval *value) {
    zend_ulong value_num_key = 0;
    zend_string *value_str_key, *tmp_key;
    if (!php_array_intersect_get_key(value, &value_num_key, &value_str_key, &tmp_key)) {
      goto cleanup;
    }
    if (value_str_key) {
      zend_symtable_update(&set, value_str_key, &one);
    } else {
      zend_hash_index_update(&set, value_num_key, &one);
    }
    zend_tmp_string_release(tmp_key);
  } ZEND_HASH_FOREACH_END();

  for (uint32_t i = 2; i < argc; i++) {
    ZEND_HASH_FOREACH_VAL(Z_ARRVAL(args[i]), zval *value) {
      zend_ulong value_num_key = 0;
      zend_string *value_str_key, *tmp_key;
      if (!php_array_intersect_get_key(value, &value_num_key, &value_str_key, &tmp_key)) {
        goto cleanup;
      }
      zval *count;
      if (value_str_key) {
        count = zend_symtable_find(&set, value_str_key);
      } else {
        count = zend_hash_index_find(&set, value_num_key);
      }
      zend_tmp_string_release(tmp_key);
      if (count && Z_LVAL_P(count) == (zend_long) i - 1) {
        ZVAL_LONG(count, i);
      }
    } ZEND_HASH_FOREACH_END();
  }

  /* Match the generic path by filtering the first argument in place if
   * possible and duplicating it otherwise. In particular, duplication keeps
   * bucket holes whose positions are observable through array_rand(). */
  HashTable *result;
  in_place = zend_may_modify_arg_in_place(&args[0]);
  if (in_place) {
    result = Z_ARRVAL(args[0]);
    ZVAL_ARR(return_value, result);
  } else {
    result = zend_array_dup(Z_ARRVAL(args[0]));
    ZVAL_ARR(return_value, result);
  }

  /* Determine all entries to remove before deleting any. Deleting an entry may
   * invoke a user destructor that changes subsequent string conversions. */
  HashTable *scanned_result = result;
  uint32_t scanned_num_used = result->nNumUsed;
  uint32_t delete_bitset_len = zend_bitset_len(scanned_num_used);
  delete_bitset = ZEND_BITSET_ALLOCA(delete_bitset_len, use_heap);
  zend_bitset_clear(delete_bitset, delete_bitset_len);

  size_t scanned_element_size = ZEND_HASH_ELEMENT_SIZE(scanned_result);
  for (uint32_t result_idx = 0; result_idx < scanned_num_used; result_idx++) {
    zval *entry = ZEND_HASH_ELEMENT_EX(scanned_result, result_idx, scanned_element_size);
    if (UNEXPECTED(Z_TYPE_P(entry) == IS_UNDEF)) {
      continue;
    }
    zend_ulong value_num_key = 0;
    zend_string *value_str_key, *tmp_key;
    if (!php_array_intersect_get_key(entry, &value_num_key, &value_str_key, &tmp_key)) {
      goto cleanup;
    }
    zval *count;
    if (value_str_key) {
      count = zend_symtable_find(&set, value_str_key);
    } else {
      count = zend_hash_index_find(&set, value_num_key);
    }
    zend_tmp_string_release(tmp_key);
    if (!count || Z_LVAL_P(count) != (zend_long) argc - 1) {
      zend_bitset_incl(delete_bitset, result_idx);
    }
  }

  /* A conversion may retain the first argument through reentrant user code,
   * so it may no longer be safe to modify the original array in place. */
  if (in_place && !zend_may_modify_arg_in_place(&args[0])) {
    result = zend_array_dup(Z_ARRVAL(args[0]));
    ZVAL_ARR(return_value, result);
    in_place = false;
  }

  /* The late duplication may compact holes, so read keys from the table whose
   * bucket indexes are stored in the bitset. */
  uint32_t result_idx;
  ZEND_BITSET_FOREACH(delete_bitset, delete_bitset_len, result_idx) {
    if (HT_IS_PACKED(scanned_result)) {
      zend_hash_index_del(result, result_idx);
    } else {
      zval *entry = ZEND_HASH_ELEMENT_EX(scanned_result, result_idx, scanned_element_size);
      Bucket *bucket = (Bucket *) entry;
      if (bucket->key) {
        zend_hash_del(result, bucket->key);
      } else {
        zend_hash_index_del(result, bucket->h);
      }
    }
  } ZEND_BITSET_FOREACH_END();

cleanup:
  if (delete_bitset) {
    free_alloca(delete_bitset, use_heap);
  }
  zend_hash_destroy(&set);
  if (in_place) {
    Z_ADDREF_P(return_value);
  }
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments */
PHP_FUNCTION(array_intersect)
{
  zval *args;
  uint32_t argc;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "+", &args, &argc) == FAILURE) {
    RETURN_THROWS();
  }

  if (argc >= 2) {
    php_array_intersect_hash(args, argc, return_value);
    return;
  }

  /* Preserve the generic path and its conversion side effects for calls with
   * a single array. */
  php_array_intersect(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_NORMAL, INTERSECT_COMP_DATA_INTERNAL, INTERSECT_COMP_KEY_INTERNAL);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments. Data is compared by using a user-supplied callback. */
PHP_FUNCTION(array_uintersect)
{
  php_array_intersect(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_NORMAL, INTERSECT_COMP_DATA_USER, INTERSECT_COMP_KEY_INTERNAL);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments. Keys are used to do more restrictive check */
PHP_FUNCTION(array_intersect_assoc)
{
  php_array_intersect_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_COMP_DATA_INTERNAL);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments. Keys are used to do more restrictive check and they are compared by using a user-supplied callback. */
PHP_FUNCTION(array_intersect_uassoc)
{
  php_array_intersect(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_ASSOC, INTERSECT_COMP_DATA_INTERNAL, INTERSECT_COMP_KEY_USER);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments. Keys are used to do more restrictive check. Data is compared by using a user-supplied callback. */
PHP_FUNCTION(array_uintersect_assoc)
{
  php_array_intersect_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_COMP_DATA_USER);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are present in all the other arguments. Keys are used to do more restrictive check. Both data and keys are compared by using user-supplied callbacks. */
PHP_FUNCTION(array_uintersect_uassoc)
{
  php_array_intersect(INTERNAL_FUNCTION_PARAM_PASSTHRU, INTERSECT_ASSOC, INTERSECT_COMP_DATA_USER, INTERSECT_COMP_KEY_USER);
}
/* }}} */

static void php_array_diff_key(INTERNAL_FUNCTION_PARAMETERS, int data_compare_type) /* {{{ */
{
  uint32_t argc, i;
  zval *args;
  int (*diff_data_compare_func)(zval *, zval *) = NULL;
  bool ok;
  zval *val, *data;
  zend_string *key;
  zend_ulong h;

  /* Get the argument count */
  argc = ZEND_NUM_ARGS();
  if (data_compare_type == DIFF_COMP_DATA_USER) {
    if (zend_parse_parameters(ZEND_NUM_ARGS(), "+f", &args, &argc, &BG(user_compare_fci), &BG(user_compare_fci_cache)) == FAILURE) {
      RETURN_THROWS();
    }
    diff_data_compare_func = zval_user_compare;
  } else {
    if (zend_parse_parameters(ZEND_NUM_ARGS(), "+", &args, &argc) == FAILURE) {
      RETURN_THROWS();
    }
    if (data_compare_type == DIFF_COMP_DATA_INTERNAL) {
      diff_data_compare_func = zval_compare;
    }
  }

  for (i = 0; i < argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      RETURN_THROWS();
    }
  }

  array_init(return_value);

  /* Iterate over keys of the first array, to compute keys that aren't in the other arrays. */
  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL(args[0]), h, key, val) {
    if (Z_ISREF_P(val) && Z_REFCOUNT_P(val) == 1) {
      val = Z_REFVAL_P(val);
    }
    if (key == NULL) {
      ok = true;
      for (i = 1; i < argc; i++) {
        if ((data = zend_hash_index_find(Z_ARRVAL(args[i]), h)) != NULL &&
          (!diff_data_compare_func ||
          diff_data_compare_func(val, data) == 0)
        ) {
          ok = false;
          break;
        }
      }
      if (ok) {
        Z_TRY_ADDREF_P(val);
        zend_hash_index_add_new(Z_ARRVAL_P(return_value), h, val);
      }
    } else {
      ok = true;
      for (i = 1; i < argc; i++) {
        if ((data = zend_hash_find_known_hash(Z_ARRVAL(args[i]), key)) != NULL &&
          (!diff_data_compare_func ||
          diff_data_compare_func(val, data) == 0)
        ) {
          ok = false;
          break;
        }
      }
      if (ok) {
        Z_TRY_ADDREF_P(val);
        zend_hash_add_new(Z_ARRVAL_P(return_value), key, val);
      }
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

static void php_array_diff(INTERNAL_FUNCTION_PARAMETERS, int behavior, int data_compare_type, int key_compare_type) /* {{{ */
{
  zval *args = NULL;
  HashTable *hash;
  uint32_t arr_argc, i;
  int c;
  uint32_t idx;
  Bucket **lists, *list, **ptrs, *p;
  char *param_spec;
  zend_fcall_info fci1, fci2;
  zend_fcall_info_cache fci1_cache = empty_fcall_info_cache, fci2_cache = empty_fcall_info_cache;
  zend_fcall_info *fci_key = NULL, *fci_data;
  zend_fcall_info_cache *fci_key_cache = NULL, *fci_data_cache;
  PHP_ARRAY_CMP_FUNC_VARS;

  bucket_compare_func_t diff_key_compare_func;
  bucket_compare_func_t diff_data_compare_func;

  if (behavior == DIFF_NORMAL) {
    diff_key_compare_func = php_array_key_compare_string_unstable;

    if (data_compare_type == DIFF_COMP_DATA_INTERNAL) {
      /* array_diff */
      param_spec = "+";
      diff_data_compare_func = php_array_data_compare_string_unstable;
    } else if (data_compare_type == DIFF_COMP_DATA_USER) {
      /* array_udiff */
      param_spec = "+f";
      diff_data_compare_func = php_array_user_compare_unstable;
    } else {
      ZEND_ASSERT(0 && "Invalid data_compare_type");
      return;
    }

    if (zend_parse_parameters(ZEND_NUM_ARGS(), param_spec, &args, &arr_argc, &fci1, &fci1_cache) == FAILURE) {
      RETURN_THROWS();
    }
    fci_data = &fci1;
    fci_data_cache = &fci1_cache;

  } else if (behavior & DIFF_ASSOC) { /* triggered also if DIFF_KEY */
    /* DIFF_KEY is subset of DIFF_ASSOC. When having the former
     * no comparison of the data is done (part of DIFF_ASSOC) */

    if (data_compare_type == DIFF_COMP_DATA_INTERNAL && key_compare_type == DIFF_COMP_KEY_INTERNAL) {
      /* array_diff_assoc() or array_diff_key() */
      param_spec = "+";
      diff_key_compare_func = php_array_key_compare_string_unstable;
      diff_data_compare_func = php_array_data_compare_string_unstable;
    } else if (data_compare_type == DIFF_COMP_DATA_USER && key_compare_type == DIFF_COMP_KEY_INTERNAL) {
      /* array_udiff_assoc() */
      param_spec = "+f";
      diff_key_compare_func = php_array_key_compare_string_unstable;
      diff_data_compare_func = php_array_user_compare_unstable;
      fci_data = &fci1;
      fci_data_cache = &fci1_cache;
    } else if (data_compare_type == DIFF_COMP_DATA_INTERNAL && key_compare_type == DIFF_COMP_KEY_USER) {
      /* array_diff_uassoc() or array_diff_ukey() */
      param_spec = "+f";
      diff_key_compare_func = php_array_user_key_compare_unstable;
      diff_data_compare_func = php_array_data_compare_string_unstable;
      fci_key = &fci1;
      fci_key_cache = &fci1_cache;
    } else if (data_compare_type == DIFF_COMP_DATA_USER && key_compare_type == DIFF_COMP_KEY_USER) {
      /* array_udiff_uassoc() */
      param_spec = "+ff";
      diff_key_compare_func = php_array_user_key_compare_unstable;
      diff_data_compare_func = php_array_user_compare_unstable;
      fci_data = &fci1;
      fci_data_cache = &fci1_cache;
      fci_key = &fci2;
      fci_key_cache = &fci2_cache;
    } else {
      ZEND_ASSERT(0 && "Invalid data_compare_type / key_compare_type");
      return;
    }

    if (zend_parse_parameters(ZEND_NUM_ARGS(), param_spec, &args, &arr_argc, &fci1, &fci1_cache, &fci2, &fci2_cache) == FAILURE) {
      RETURN_THROWS();
    }

  } else {
    ZEND_ASSERT(0 && "Invalid behavior");
    return;
  }

  PHP_ARRAY_CMP_FUNC_BACKUP();

  /* for each argument, create and sort list with pointers to the hash buckets */
  lists = (Bucket **)safe_emalloc(arr_argc, sizeof(Bucket *), 0);
  ptrs = (Bucket **)safe_emalloc(arr_argc, sizeof(Bucket *), 0);

  if (behavior == DIFF_NORMAL && data_compare_type == DIFF_COMP_DATA_USER) {
    BG(user_compare_fci) = *fci_data;
    BG(user_compare_fci_cache) = *fci_data_cache;
  } else if ((behavior & DIFF_ASSOC) && key_compare_type == DIFF_COMP_KEY_USER) {
    BG(user_compare_fci) = *fci_key;
    BG(user_compare_fci_cache) = *fci_key_cache;
  }

  for (i = 0; i < arr_argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      arr_argc = i; /* only free up to i - 1 */
      goto out;
    }
    hash = Z_ARRVAL(args[i]);
    list = (Bucket *) pemalloc((hash->nNumOfElements + 1) * sizeof(Bucket), GC_FLAGS(hash) & IS_ARRAY_PERSISTENT);
    lists[i] = list;
    ptrs[i] = list;
    if (HT_IS_PACKED(hash)) {
      zval *zv = hash->arPacked;
      for (idx = 0; idx < hash->nNumUsed; idx++, zv++) {
        if (Z_TYPE_P(zv) == IS_UNDEF) continue;
        ZVAL_COPY_VALUE(&list->val, zv);
        list->h = idx;
        list->key = NULL;
        list++;
      }
    } else {
      p = hash->arData;
      for (idx = 0; idx < hash->nNumUsed; idx++, p++) {
        if (Z_TYPE(p->val) == IS_UNDEF) continue;
        *list++ = *p;
      }
    }
    ZVAL_UNDEF(&list->val);
    if (hash->nNumOfElements > 1) {
      if (behavior == DIFF_NORMAL) {
        zend_sort((void *) lists[i], hash->nNumOfElements,
            sizeof(Bucket), (compare_func_t) diff_data_compare_func,
            (swap_func_t)zend_hash_bucket_swap);
      } else if (behavior & DIFF_ASSOC) { /* triggered also when DIFF_KEY */
        zend_sort((void *) lists[i], hash->nNumOfElements,
            sizeof(Bucket), (compare_func_t) diff_key_compare_func,
            (swap_func_t)zend_hash_bucket_swap);
      }
    }
  }

  /* copy the argument array */
  RETVAL_ARR(zend_array_dup(Z_ARRVAL(args[0])));

  /* go through the lists and look for values of ptr[0] that are not in the others */
  while (Z_TYPE(ptrs[0]->val) != IS_UNDEF) {
    if ((behavior & DIFF_ASSOC) /* triggered also when DIFF_KEY */
      &&
      key_compare_type == DIFF_COMP_KEY_USER
    ) {
      BG(user_compare_fci) = *fci_key;
      BG(user_compare_fci_cache) = *fci_key_cache;
    }
    c = 1;
    for (i = 1; i < arr_argc; i++) {
      Bucket *ptr = ptrs[i];
      if (behavior == DIFF_NORMAL) {
        while (Z_TYPE(ptrs[i]->val) != IS_UNDEF && (0 < (c = diff_data_compare_func(ptrs[0], ptrs[i])))) {
          ptrs[i]++;
        }
      } else if (behavior & DIFF_ASSOC) { /* triggered also when DIFF_KEY */
        while (Z_TYPE(ptr->val) != IS_UNDEF && (0 != (c = diff_key_compare_func(ptrs[0], ptr)))) {
          ptr++;
        }
      }
      if (!c) {
        if (behavior == DIFF_NORMAL) {
          if (Z_TYPE(ptrs[i]->val) != IS_UNDEF) {
            ptrs[i]++;
          }
          break;
        } else if (behavior == DIFF_ASSOC) {  /* only when DIFF_ASSOC */
          /* In this branch is execute only when DIFF_ASSOC. If behavior == DIFF_KEY
           * data comparison is not needed - skipped. */
          if (Z_TYPE(ptr->val) != IS_UNDEF) {
            if (data_compare_type == DIFF_COMP_DATA_USER) {
              BG(user_compare_fci) = *fci_data;
              BG(user_compare_fci_cache) = *fci_data_cache;
            }
            if (diff_data_compare_func(ptrs[0], ptr) != 0) {
              /* the data is not the same */
              c = -1;
              if (key_compare_type == DIFF_COMP_KEY_USER) {
                BG(user_compare_fci) = *fci_key;
                BG(user_compare_fci_cache) = *fci_key_cache;
              }
            } else {
              break;
              /* we have found the element in other arrays thus we don't want it
               * in the return_value -> delete from there */
            }
          }
        } else if (behavior == DIFF_KEY) { /* only when DIFF_KEY */
          /* the behavior here differs from INTERSECT_KEY in php_intersect
           * since in the "diff" case we have to remove the entry from
           * return_value while when doing intersection the entry must not
           * be deleted. */
          break; /* remove the key */
        }
      }
    }
    if (!c) {
      /* ptrs[0] in one of the other arguments */
      /* delete all entries with value as ptrs[0] */
      for (;;) {
        p = ptrs[0];
        if (p->key == NULL) {
          zend_hash_index_del(Z_ARRVAL_P(return_value), p->h);
        } else {
          zend_hash_del(Z_ARRVAL_P(return_value), p->key);
        }
        if (Z_TYPE((++ptrs[0])->val) == IS_UNDEF) {
          goto out;
        }
        if (behavior == DIFF_NORMAL) {
          if (diff_data_compare_func(ptrs[0] - 1, ptrs[0])) {
            break;
          }
        } else if (behavior & DIFF_ASSOC) { /* triggered also when DIFF_KEY */
          /* in this case no array_key_compare is needed */
          break;
        }
      }
    } else {
      /* ptrs[0] in none of the other arguments */
      /* skip all entries with value as ptrs[0] */
      for (;;) {
        if (Z_TYPE((++ptrs[0])->val) == IS_UNDEF) {
          goto out;
        }
        if (behavior == DIFF_NORMAL) {
          if (diff_data_compare_func(ptrs[0] - 1, ptrs[0])) {
            break;
          }
        } else if (behavior & DIFF_ASSOC) { /* triggered also when DIFF_KEY */
          /* in this case no array_key_compare is needed */
          break;
        }
      }
    }
  }
out:
  for (i = 0; i < arr_argc; i++) {
    hash = Z_ARRVAL(args[i]);
    pefree(lists[i], GC_FLAGS(hash) & IS_ARRAY_PERSISTENT);
  }

  PHP_ARRAY_CMP_FUNC_RESTORE();

  efree(ptrs);
  efree(lists);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have keys which are not present in any of the others arguments. This function is like array_diff() but works on the keys instead of the values. The associativity is preserved. */
PHP_FUNCTION(array_diff_key)
{
  php_array_diff_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_COMP_DATA_NONE);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have keys which are not present in any of the others arguments. User supplied function is used for comparing the keys. This function is like array_udiff() but works on the keys instead of the values. The associativity is preserved. */
PHP_FUNCTION(array_diff_ukey)
{
  php_array_diff(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_KEY, DIFF_COMP_DATA_INTERNAL, DIFF_COMP_KEY_USER);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments. */
PHP_FUNCTION(array_diff)
{
  zval *args;
  uint32_t argc, i;
  uint64_t num;
  HashTable exclude;
  zval *value;
  zend_string *str, *tmp_str, *key;
  zend_long idx;
  zval dummy;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  if (Z_TYPE(args[0]) != IS_ARRAY) {
    zend_argument_type_error(1, "must be of type array, %s given", zend_zval_value_name(&args[0]));
    RETURN_THROWS();
  }

  num = zend_hash_num_elements(Z_ARRVAL(args[0]));
  if (num == 0) {
    for (i = 1; i < argc; i++) {
      if (Z_TYPE(args[i]) != IS_ARRAY) {
        zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
        RETURN_THROWS();
      }
    }
    RETURN_EMPTY_ARRAY();
  } else if (num == 1) {
    int found = 0;
    zend_string *search_str, *tmp_search_str;

    value = NULL;
    ZEND_HASH_FOREACH_VAL(Z_ARRVAL(args[0]), value) {
      break;
    } ZEND_HASH_FOREACH_END();

    if (!value) {
      for (i = 1; i < argc; i++) {
        if (Z_TYPE(args[i]) != IS_ARRAY) {
          zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
          RETURN_THROWS();
        }
      }
      RETURN_EMPTY_ARRAY();
    }

    search_str = zval_get_tmp_string(value, &tmp_search_str);

    for (i = 1; i < argc; i++) {
      if (Z_TYPE(args[i]) != IS_ARRAY) {
        zend_tmp_string_release(tmp_search_str);
        zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
        RETURN_THROWS();
      }
      if (!found) {
        ZEND_HASH_FOREACH_VAL(Z_ARRVAL(args[i]), value) {
          str = zval_get_tmp_string(value, &tmp_str);
          if (zend_string_equals(search_str, str)) {
            zend_tmp_string_release(tmp_str);
            found = 1;
            break;
          }
          zend_tmp_string_release(tmp_str);
        } ZEND_HASH_FOREACH_END();
      }
    }

    zend_tmp_string_release(tmp_search_str);

    if (found) {
      RETVAL_EMPTY_ARRAY();
    } else {
      ZVAL_COPY(return_value, &args[0]);
    }
    return;
  }

  /* count number of elements */
  num = 0;
  for (i = 1; i < argc; i++) {
    if (Z_TYPE(args[i]) != IS_ARRAY) {
      zend_argument_type_error(i + 1, "must be of type array, %s given", zend_zval_value_name(&args[i]));
      RETURN_THROWS();
    }
    num += zend_hash_num_elements(Z_ARRVAL(args[i]));
  }

  if (num == 0) {
    ZVAL_COPY(return_value, &args[0]);
    return;
  }

  if (UNEXPECTED(num >= HT_MAX_SIZE)) {
    zend_throw_error(NULL, "The total number of elements must be lower than %u", HT_MAX_SIZE);
    RETURN_THROWS();
  }

  ZVAL_NULL(&dummy);
  /* create exclude map */
  zend_hash_init(&exclude, num, NULL, NULL, 0);
  for (i = 1; i < argc; i++) {
    ZEND_HASH_FOREACH_VAL(Z_ARRVAL(args[i]), value) {
      str = zval_get_tmp_string(value, &tmp_str);
      zend_hash_add(&exclude, str, &dummy);
      zend_tmp_string_release(tmp_str);
    } ZEND_HASH_FOREACH_END();
  }

  /* copy all elements of first array that are not in exclude set */
  array_init_size(return_value, zend_hash_num_elements(Z_ARRVAL(args[0])));
  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL(args[0]), idx, key, value) {
    str = zval_get_tmp_string(value, &tmp_str);
    if (!zend_hash_exists(&exclude, str)) {
      if (key) {
        value = zend_hash_add_new(Z_ARRVAL_P(return_value), key, value);
      } else {
        value = zend_hash_index_add_new(Z_ARRVAL_P(return_value), idx, value);
      }
      zval_add_ref(value);
    }
    zend_tmp_string_release(tmp_str);
  } ZEND_HASH_FOREACH_END();

  zend_hash_destroy(&exclude);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments. Elements are compared by user supplied function. */
PHP_FUNCTION(array_udiff)
{
  php_array_diff(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_NORMAL, DIFF_COMP_DATA_USER, DIFF_COMP_KEY_INTERNAL);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments but do additional checks whether the keys are equal */
PHP_FUNCTION(array_diff_assoc)
{
  php_array_diff_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_COMP_DATA_INTERNAL);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments but do additional checks whether the keys are equal. Elements are compared by user supplied function. */
PHP_FUNCTION(array_diff_uassoc)
{
  php_array_diff(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_ASSOC, DIFF_COMP_DATA_INTERNAL, DIFF_COMP_KEY_USER);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments but do additional checks whether the keys are equal. Keys are compared by user supplied function. */
PHP_FUNCTION(array_udiff_assoc)
{
  php_array_diff_key(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_COMP_DATA_USER);
}
/* }}} */

/* {{{ Returns the entries of arr1 that have values which are not present in any of the others arguments but do additional checks whether the keys are equal. Keys and elements are compared by user supplied functions. */
PHP_FUNCTION(array_udiff_uassoc)
{
  php_array_diff(INTERNAL_FUNCTION_PARAM_PASSTHRU, DIFF_ASSOC, DIFF_COMP_DATA_USER, DIFF_COMP_KEY_USER);
}
/* }}} */

#define MULTISORT_ORDER 0
#define MULTISORT_TYPE  1
#define MULTISORT_LAST  2

PHPAPI int php_multisort_compare(const void *a, const void *b) /* {{{ */
{
  Bucket *ab = *(Bucket **)a;
  Bucket *bb = *(Bucket **)b;
  int r;
  zend_long result;

  r = 0;
  do {
    result = ARRAYG(multisort_func)[r](&ab[r], &bb[r]);
    if (result != 0) {
      return result > 0 ? 1 : -1;
    }
    r++;
  } while (Z_TYPE(ab[r].val) != IS_UNDEF);

  return stable_sort_fallback(&ab[r], &bb[r]);
}
/* }}} */

#define MULTISORT_ABORT       \
  efree(func); \
  efree(arrays);         \
  return;

static void array_bucket_p_sawp(void *p, void *q) /* {{{ */ {
  Bucket *t;
  Bucket **f = (Bucket **)p;
  Bucket **g = (Bucket **)q;

  t = *f;
  *f = *g;
  *g = t;
}
/* }}} */

/* {{{ Sort multiple arrays at once similar to how ORDER BY clause works in SQL */
PHP_FUNCTION(array_multisort)
{
  zval*     args;
  zval**      arrays;
  HashTable**   hashes;
  Bucket**    indirect;
  uint32_t    idx;
  HashTable*    hash;
  uint32_t    argc;
  uint32_t    array_size;
  uint32_t    num_arrays = 0;
  int       parse_state[MULTISORT_LAST];   /* 0 - flag not allowed 1 - flag allowed */
  int       sort_order = PHP_SORT_ASC;
  int       sort_type  = PHP_SORT_REGULAR;
  uint32_t    i, k, n;
  bucket_compare_func_t *func;

  ZEND_PARSE_PARAMETERS_START(1, -1)
    Z_PARAM_VARIADIC('+', args, argc)
  ZEND_PARSE_PARAMETERS_END();

  /* Allocate space for storing pointers to input arrays and sort flags. */
  arrays = (zval **)ecalloc(argc, sizeof(zval *));
  for (i = 0; i < MULTISORT_LAST; i++) {
    parse_state[i] = 0;
  }
  func = ecalloc(argc, sizeof(bucket_compare_func_t));

  /* Here we go through the input arguments and parse them. Each one can
   * be either an array or a sort flag which follows an array. If not
   * specified, the sort flags defaults to PHP_SORT_ASC and PHP_SORT_REGULAR
   * accordingly. There can't be two sort flags of the same type after an
   * array, and the very first argument has to be an array. */
  for (i = 0; i < argc; i++) {
    zval *arg = &args[i];

    ZVAL_DEREF(arg);
    if (Z_TYPE_P(arg) == IS_ARRAY) {
      SEPARATE_ARRAY(arg);
      /* We see the next array, so we update the sort flags of
       * the previous array and reset the sort flags. */
      if (i > 0) {
        func[num_arrays - 1] = php_get_data_compare_func_unstable(sort_type, sort_order != PHP_SORT_ASC);
        sort_order = PHP_SORT_ASC;
        sort_type = PHP_SORT_REGULAR;
      }
      arrays[num_arrays++] = arg;

      /* Next one may be an array or a list of sort flags. */
      for (k = 0; k < MULTISORT_LAST; k++) {
        parse_state[k] = 1;
      }
    } else if (Z_TYPE_P(arg) == IS_LONG) {
      switch (Z_LVAL_P(arg) & ~PHP_SORT_FLAG_CASE) {
        case PHP_SORT_ASC:
        case PHP_SORT_DESC:
          /* flag allowed here */
          if (parse_state[MULTISORT_ORDER] == 1) {
            /* Save the flag and make sure then next arg is not the current flag. */
            sort_order = Z_LVAL_P(arg) == PHP_SORT_DESC ? PHP_SORT_DESC : PHP_SORT_ASC;
            parse_state[MULTISORT_ORDER] = 0;
          } else {
            zend_argument_type_error(i + 1, "must be an array or a sort flag that has not already been specified");
            MULTISORT_ABORT;
          }
          break;

        case PHP_SORT_REGULAR:
        case PHP_SORT_NUMERIC:
        case PHP_SORT_STRING:
        case PHP_SORT_NATURAL:
        case PHP_SORT_LOCALE_STRING:
          /* flag allowed here */
          if (parse_state[MULTISORT_TYPE] == 1) {
            /* Save the flag and make sure then next arg is not the current flag. */
            sort_type = (int)Z_LVAL_P(arg);
            parse_state[MULTISORT_TYPE] = 0;
          } else {
            zend_argument_type_error(i + 1, "must be an array or a sort flag that has not already been specified");
            MULTISORT_ABORT;
          }
          break;

        default:
          zend_argument_value_error(i + 1, "must be a valid sort flag");
          MULTISORT_ABORT;
          break;

      }
    } else {
      zend_argument_type_error(i + 1, "must be an array or a sort flag");
      MULTISORT_ABORT;
    }
  }

  /* Make sure the arrays are of the same size. */
  array_size = zend_hash_num_elements(Z_ARRVAL_P(arrays[0]));
  for (i = 1; i < num_arrays; i++) {
    if (zend_hash_num_elements(Z_ARRVAL_P(arrays[i])) != array_size) {
      zend_value_error("Array sizes are inconsistent");
      MULTISORT_ABORT;
    }
  }

  /* If all arrays are empty we don't need to do anything. */
  if (array_size < 1) {
    efree(func);
    efree(arrays);
    RETURN_TRUE;
  }

  /* Take care of the last array sort flags. */
  func[num_arrays - 1] = php_get_data_compare_func_unstable(sort_type, sort_order != PHP_SORT_ASC);
  bucket_compare_func_t *old_multisort_func = ARRAYG(multisort_func);
  ARRAYG(multisort_func) = func;

  /* Create the indirection array. This array is of size MxN, where
   * M is the number of entries in each input array and N is the number
   * of the input arrays + 1. The last column is UNDEF to indicate the end
   * of the row. It also stores the original position for stable sorting. */
  indirect = (Bucket **)safe_emalloc(array_size, sizeof(Bucket *), 0);
  /* Move num_arrays multiplication to size because it's essentially impossible to overflow. */
  Bucket *indirects = (Bucket *)safe_emalloc(array_size, sizeof(Bucket) * (num_arrays + 1), 0);
  for (i = 0; i < array_size; i++) {
    indirect[i] = indirects + (i * (num_arrays + 1));
  }
  hashes = safe_emalloc(num_arrays, sizeof(HashTable *), 0);
  for (i = 0; i < num_arrays; i++) {
    hashes[i] = Z_ARRVAL_P(arrays[i]);
    GC_ADDREF(hashes[i]);
    HT_ALLOW_COW_VIOLATION(hashes[i]);
  }
  for (i = 0; i < num_arrays; i++) {
    k = 0;
    if (HT_IS_PACKED(hashes[i])) {
      zval *zv = hashes[i]->arPacked;
      for (idx = 0; idx < hashes[i]->nNumUsed; idx++, zv++) {
        if (Z_TYPE_P(zv) == IS_UNDEF) continue;
        ZVAL_COPY_VALUE(&indirect[k][i].val, zv);
        indirect[k][i].h = idx;
        indirect[k][i].key = NULL;
        k++;
      }
    } else {
      Bucket *p = hashes[i]->arData;
      for (idx = 0; idx < hashes[i]->nNumUsed; idx++, p++) {
        if (Z_TYPE(p->val) == IS_UNDEF) continue;
        indirect[k][i] = *p;
        k++;
      }
    }
  }
  for (k = 0; k < array_size; k++) {
    ZVAL_UNDEF(&indirect[k][num_arrays].val);
    Z_EXTRA_P(&indirect[k][num_arrays].val) = k;
  }

  /* Do the actual sort magic - bada-bim, bada-boom. */
  zend_sort(indirect, array_size, sizeof(Bucket *), php_multisort_compare, (swap_func_t)array_bucket_p_sawp);
  if (EG(exception)) {
    goto clean_up;
  }

  /* Restructure the arrays based on sorted indirect - this is mostly taken from zend_hash_sort() function. */
  for (i = 0; i < num_arrays; i++) {
    hash = hashes[i];
    hash->nNumUsed = array_size;
    hash->nNextFreeElement = array_size;
    hash->nInternalPointer = 0;
    if (HT_IS_PACKED(hash)) {
      for (k = 0; k < array_size; k++) {
        ZVAL_COPY_VALUE(&hash->arPacked[k], &indirect[k][i].val);
      }
    } else {
      bool repack = true;

      for (n = 0, k = 0; k < array_size; k++) {
        hash->arData[k] = indirect[k][i];
        if (hash->arData[k].key == NULL) {
          hash->arData[k].h = n++;
        } else {
          repack = false;
        }
      }
      if (repack) {
        zend_hash_to_packed(hash);
      } else {
        zend_hash_rehash(hash);
      }
    }
  }
  RETVAL_TRUE;

clean_up:
  for (i = 0; i < num_arrays; i++) {
    if (UNEXPECTED(GC_DELREF(hashes[i]) == 0)) {
      zend_array_destroy(hashes[i]);
    } else {
      gc_check_possible_root((zend_refcounted *)hashes[i]);
    }
  }
  efree(hashes);
  efree(indirects);
  efree(indirect);
  efree(func);
  efree(arrays);
  ARRAYG(multisort_func) = old_multisort_func;
}
/* }}} */

/* {{{ php_array_pick_keys */
PHPAPI bool php_array_pick_keys(php_random_algo_with_state engine, zval *input, zend_long num_req, zval *retval, bool silent)
{
  const php_random_algo *algo = engine.algo;
  void *state = engine.state;

  HashTable *ht = Z_ARRVAL_P(input);
  uint32_t num_avail = zend_hash_num_elements(ht);
  zend_long i, randval;
  zend_string *string_key;
  zend_ulong num_key;
  zval *zv;
  Bucket *b;
  zend_bitset bitset;
  int negative_bitset = 0;
  uint32_t bitset_len;
  ALLOCA_FLAG(use_heap);

  if (num_avail == 0) {
    if (!silent) {
      zend_argument_must_not_be_empty_error(1);
    }
    return false;
  }

  if (num_req == 1) {
    if (num_avail < ht->nNumUsed - (ht->nNumUsed >> 1)) {
      /* If less than 1/2 of elements are used, don't sample. Instead search for a
       * specific offset using linear scan. */
      i = 0;
      randval = algo->range(state, 0, num_avail - 1);
      if (EG(exception)) {
        return false;
      }
      ZEND_HASH_FOREACH_KEY(ht, num_key, string_key) {
        if (i == randval) {
          if (string_key) {
            ZVAL_STR_COPY(retval, string_key);
          } else {
            ZVAL_LONG(retval, num_key);
          }
          return true;
        }
        i++;
      } ZEND_HASH_FOREACH_END();
    }

    /* Sample random buckets until we hit one that is not empty.
     * The worst case probability of hitting an empty element is 1-1/2. The worst case
     * probability of hitting N empty elements in a row is (1-1/2)**N.
     * For N=10 this becomes smaller than 0.1%. */
    if (HT_IS_PACKED(ht)) {
      do {
        randval = algo->range(state, 0, ht->nNumUsed - 1);
        if (EG(exception)) {
          return false;
        }
        zv = &ht->arPacked[randval];
        if (!Z_ISUNDEF_P(zv)) {
          ZVAL_LONG(retval, randval);
          return true;
        }
      } while (true);
    } else {
      do {
        randval = algo->range(state, 0, ht->nNumUsed - 1);
        if (EG(exception)) {
          return false;
        }
        b = &ht->arData[randval];
        if (!Z_ISUNDEF(b->val)) {
          if (b->key) {
            ZVAL_STR_COPY(retval, b->key);
          } else {
            ZVAL_LONG(retval, b->h);
          }
          return true;
        }
      } while (true);
    }
  }

  if (num_req <= 0 || num_req > num_avail) {
    if (!silent) {
      zend_argument_value_error(2, "must be between 1 and the number of elements in argument #1 ($array)");
    }
    return false;
  }

  /* Make the return value an array only if we need to pass back more than one result. */
  array_init_size(retval, (uint32_t) num_req);
  if (num_req > (num_avail >> 1)) {
    negative_bitset = 1;
    num_req = num_avail - num_req;
  }

  bitset_len = zend_bitset_len(num_avail);
  bitset = ZEND_BITSET_ALLOCA(bitset_len, use_heap);
  zend_bitset_clear(bitset, bitset_len);

  i = num_req;
  int failures = 0;
  while (i) {
    randval = algo->range(state, 0, num_avail - 1);
    if (EG(exception)) {
      goto fail;
    }
    if (zend_bitset_in(bitset, randval)) {
      if (++failures > PHP_RANDOM_RANGE_ATTEMPTS) {
        if (!silent) {
          zend_throw_error(random_ce_Random_BrokenRandomEngineError, "Failed to generate an acceptable random number in %d attempts", PHP_RANDOM_RANGE_ATTEMPTS);
        }

        goto fail;
      }
    } else {
      zend_bitset_incl(bitset, randval);
      i--;
      failures = 0;
    }
  }

  zend_hash_real_init_packed(Z_ARRVAL_P(retval));
  ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(retval)) {
    /* We can't use zend_hash_index_find()
     * because the array may have string keys or gaps. */
    ZEND_HASH_FOREACH_KEY(ht, num_key, string_key) {
      if (zend_bitset_in(bitset, i) ^ negative_bitset) {
        if (string_key) {
          ZEND_HASH_FILL_SET_STR_COPY(string_key);
        } else {
          ZEND_HASH_FILL_SET_LONG(num_key);
        }
        ZEND_HASH_FILL_NEXT();
      }
      i++;
    } ZEND_HASH_FOREACH_END();
  } ZEND_HASH_FILL_END();

  free_alloca(bitset, use_heap);

  return true;

 fail:
  free_alloca(bitset, use_heap);

  return false;
}
/* }}} */

/* {{{ Return key/keys for random entry/entries in the array */
PHP_FUNCTION(array_rand)
{
  zval *input;
  zend_long num_req = 1;

  ZEND_PARSE_PARAMETERS_START(1, 2)
    Z_PARAM_ARRAY(input)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(num_req)
  ZEND_PARSE_PARAMETERS_END();

  if (!php_array_pick_keys(
      php_random_default_engine(),
      input,
      num_req,
      return_value,
      false)
  ) {
    RETURN_THROWS();
  }
}
/* }}} */

/* Apply a single array_sum/array_product step to return_value. */
static zend_always_inline void php_array_binop_apply(
    zval *return_value, zval *entry, const char *op_name, binary_op_type op)
{
  /* For objects we try to cast them to a numeric type */
  if (Z_TYPE_P(entry) == IS_OBJECT) {
    zval dst;
    zend_result status = Z_OBJ_HT_P(entry)->cast_object(Z_OBJ_P(entry), &dst, _IS_NUMBER);

    /* Do not type error for BC */
    if (status == FAILURE || (Z_TYPE(dst) != IS_LONG && Z_TYPE(dst) != IS_DOUBLE)) {
      php_error_docref(NULL, E_WARNING, "%s is not supported on type %s",
        op_name, zend_zval_type_name(entry));
      return;
    }
    op(return_value, return_value, &dst);
    return;
  }

  zend_result status = op(return_value, return_value, entry);
  if (status == FAILURE) {
    ZEND_ASSERT(EG(exception));
    zend_clear_exception();
    /* BC resources: previously resources were cast to int */
    if (Z_TYPE_P(entry) == IS_RESOURCE) {
      zval tmp;
      ZVAL_LONG(&tmp, Z_RES_HANDLE_P(entry));
      op(return_value, return_value, &tmp);
    }
    /* BC non numeric strings: previously were cast to 0 */
    else if (Z_TYPE_P(entry) == IS_STRING) {
      zval tmp;
      ZVAL_LONG(&tmp, 0);
      op(return_value, return_value, &tmp);
    }
    php_error_docref(NULL, E_WARNING, "%s is not supported on type %s",
      op_name, zend_zval_type_name(entry));
  }
}

/* Wrapper for array_sum and array_product */
static zend_always_inline void php_array_binop(INTERNAL_FUNCTION_PARAMETERS, const char *op_name, binary_op_type op, zend_long initial)
{
  HashTable *input;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ARRAY_HT(input)
  ZEND_PARSE_PARAMETERS_END();

  if (zend_hash_num_elements(input) == 0) {
    RETURN_LONG(initial);
  }

  ZVAL_LONG(return_value, initial);

  if (op == add_function) {
    zval *entry;
    ZEND_HASH_FOREACH_VAL(input, entry) {
      if (EXPECTED(Z_TYPE_P(entry) == IS_LONG) && EXPECTED(Z_TYPE_P(return_value) == IS_LONG)) {
        fast_long_add_function(return_value, return_value, entry);
        continue;
      }
      php_array_binop_apply(return_value, entry, op_name, op);
    } ZEND_HASH_FOREACH_END();
  } else if (op == mul_function) {
    zval *entry;
    ZEND_HASH_FOREACH_VAL(input, entry) {
      if (EXPECTED(Z_TYPE_P(entry) == IS_LONG) && EXPECTED(Z_TYPE_P(return_value) == IS_LONG)) {
        zend_long lval;
        double dval;
        int overflow;
        ZEND_SIGNED_MULTIPLY_LONG(Z_LVAL_P(return_value), Z_LVAL_P(entry), lval, dval, overflow);
        if (UNEXPECTED(overflow)) {
          ZVAL_DOUBLE(return_value, dval);
        } else {
          Z_LVAL_P(return_value) = lval;
        }
        continue;
      }
      php_array_binop_apply(return_value, entry, op_name, op);
    } ZEND_HASH_FOREACH_END();
  } else {
    zval *entry;
    ZEND_HASH_FOREACH_VAL(input, entry) {
      php_array_binop_apply(return_value, entry, op_name, op);
    } ZEND_HASH_FOREACH_END();
  }
}

/* {{{ Returns the sum of the array entries */
PHP_FUNCTION(array_sum)
{
  php_array_binop(INTERNAL_FUNCTION_PARAM_PASSTHRU, "Addition", add_function, 0);
}
/* }}} */

/* {{{ Returns the product of the array entries */
PHP_FUNCTION(array_product)
{
  php_array_binop(INTERNAL_FUNCTION_PARAM_PASSTHRU, "Multiplication", mul_function, 1);
}
/* }}} */

/* {{{ Iteratively reduce the array to a single value via the callback. */
PHP_FUNCTION(array_reduce)
{
  zval *input;
  zval args[2];
  zval *operand;
  zend_fcall_info fci;
  zend_fcall_info_cache fci_cache;
  zval *initial = NULL;
  HashTable *htbl;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ARRAY(input)
    Z_PARAM_FUNC(fci, fci_cache)
    Z_PARAM_OPTIONAL
    Z_PARAM_ZVAL(initial)
  ZEND_PARSE_PARAMETERS_END();

  if (initial) {
    ZVAL_COPY(return_value, initial);
  } else {
    ZVAL_NULL(return_value);
  }

  /* (zval **)input points to an element of argument stack
   * the base pointer of which is subject to change.
   * thus we need to keep the pointer to the hashtable for safety */
  htbl = Z_ARRVAL_P(input);

  if (zend_hash_num_elements(htbl) == 0) {
    return;
  }

  fci.retval = return_value;
  fci.param_count = 2;
  fci.params = args;
  fci.consumed_args = zend_fci_consumed_arg(0);

  ZEND_HASH_FOREACH_VAL(htbl, operand) {
    ZVAL_COPY_VALUE(&args[0], return_value);
    ZVAL_COPY_VALUE(&args[1], operand);

    zend_call_function(&fci, &fci_cache);
    zval_ptr_dtor(&args[0]);

    if (EXPECTED(!Z_ISUNDEF_P(return_value))) {
      if (UNEXPECTED(Z_ISREF_P(return_value))) {
        zend_unwrap_reference(return_value);
      }
    } else {
      RETURN_NULL();
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* Consumes `zv` */
static bool php_is_true(zval *zv)
{
  switch (Z_TYPE_P(zv)) {
    case IS_TRUE:
      return true;
    case IS_FALSE:
      return false;
    default: {
      bool rv = zend_is_true(zv);
      zval_ptr_dtor(zv);
      return rv;
    }
  }
}

/* {{{ Filters elements from the array via the callback. */
PHP_FUNCTION(array_filter)
{
  zval *array;
  zval *operand;
  zval *key;
  zval args[2];
  zval retval;
  bool have_callback = 0;
  zend_long use_type = ARRAY_FILTER_USE_VALUE;
  zend_string *string_key;
  zend_fcall_info fci = empty_fcall_info;
  zend_fcall_info_cache fci_cache;
  zend_ulong num_key;

  ZEND_PARSE_PARAMETERS_START(1, 3)
    Z_PARAM_ARRAY(array)
    Z_PARAM_OPTIONAL
    Z_PARAM_FUNC_OR_NULL(fci, fci_cache)
    Z_PARAM_LONG(use_type)
  ZEND_PARSE_PARAMETERS_END();

  switch (use_type) {
    case ARRAY_FILTER_USE_VALUE:
    case ARRAY_FILTER_USE_BOTH:
    case ARRAY_FILTER_USE_KEY:
      break;
    default:
      zend_argument_value_error(3, "must be one of ARRAY_FILTER_USE_VALUE, ARRAY_FILTER_USE_KEY, or ARRAY_FILTER_USE_BOTH");
    RETURN_THROWS();
  }

  if (zend_hash_num_elements(Z_ARRVAL_P(array)) == 0) {
    RETURN_EMPTY_ARRAY();
  }
  array_init(return_value);

  if (ZEND_FCI_INITIALIZED(fci)) {
    have_callback = 1;
    fci.retval = &retval;
    if (use_type == ARRAY_FILTER_USE_BOTH) {
      fci.param_count = 2;
      key = &args[1];
    } else {
      fci.param_count = 1;
      key = &args[0];
    }
  }

  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(array), num_key, string_key, operand) {
    if (have_callback) {
      if (use_type != ARRAY_FILTER_USE_VALUE) {
        /* Set up the key */
        if (!string_key) {
          ZVAL_LONG(key, num_key);
        } else {
          ZVAL_STR(key, string_key);
        }
      }
      if (use_type != ARRAY_FILTER_USE_KEY) {
        ZVAL_COPY_VALUE(&args[0], operand);
      }
      fci.params = args;

      zend_result result = zend_call_function(&fci, &fci_cache);
      ZEND_ASSERT(result == SUCCESS);

      if (UNEXPECTED(EG(exception))) {
        RETURN_THROWS();
      }

      if (!php_is_true(&retval)) {
        continue;
      }
    } else if (!zend_is_true(operand)) {
      continue;
    }

    if (string_key) {
      operand = zend_hash_add_new(Z_ARRVAL_P(return_value), string_key, operand);
    } else {
      operand = zend_hash_index_add_new(Z_ARRVAL_P(return_value), num_key, operand);
    }
    zval_add_ref(operand);
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* {{{ Internal function to find an array element for a user closure. */
enum php_array_find_result {
  PHP_ARRAY_FIND_EXCEPTION = -1,
  PHP_ARRAY_FIND_NONE = 0,
  PHP_ARRAY_FIND_SOME = 1,
};

static enum php_array_find_result php_array_find(const HashTable *array, const zend_fcall_info_cache *fcc, zval *result_key, zval *result_value, bool negate_condition)
{
  zval retval;
  zval args[2];

  if (zend_hash_num_elements(array) == 0) {
    return PHP_ARRAY_FIND_NONE;
  }

  ZEND_HASH_FOREACH_KEY_VAL(array, zend_ulong num_key, zend_string *str_key, zval *operand) {
    /* Set up the key */
    if (!str_key) {
      ZVAL_LONG(&args[1], num_key);
    } else {
      /* Allows copying the numeric branch, without this branch, into the iteration code
       * that checks for the packed array flag. */
      ZEND_ASSUME(!HT_IS_PACKED(array));
      ZVAL_STR(&args[1], str_key);
    }

    ZVAL_COPY_VALUE(&args[0], operand);

    zend_call_known_fcc(fcc, &retval, 2, args, NULL);

    if (UNEXPECTED(Z_ISUNDEF(retval))) {
      return PHP_ARRAY_FIND_EXCEPTION;
    }

    if (php_is_true(&retval) ^ negate_condition) {
      if (result_value != NULL) {
        ZVAL_COPY_DEREF(result_value, &args[0]);
      }

      if (result_key != NULL) {
        ZVAL_COPY(result_key, &args[1]);
      }

      return PHP_ARRAY_FIND_SOME;
    }
  } ZEND_HASH_FOREACH_END();

  return PHP_ARRAY_FIND_NONE;
}
/* }}} */

/* {{{ Search within an array and returns the first found element value. */
PHP_FUNCTION(array_find)
{
  HashTable *array;
  zend_fcall_info fci;
  zend_fcall_info_cache fcc;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_HT(array)
    Z_PARAM_FUNC_NO_TRAMPOLINE_FREE(fci, fcc)
  ZEND_PARSE_PARAMETERS_END();

  php_array_find(array, &fcc, NULL, return_value, false);
  zend_release_fcall_info_cache(&fcc);
}
/* }}} */

/* {{{ Search within an array and returns the first found element key. */
PHP_FUNCTION(array_find_key)
{
  HashTable *array;
  zend_fcall_info fci;
  zend_fcall_info_cache fcc;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_HT(array)
    Z_PARAM_FUNC_NO_TRAMPOLINE_FREE(fci, fcc)
  ZEND_PARSE_PARAMETERS_END();

  php_array_find(array, &fcc, return_value, NULL, false);
  zend_release_fcall_info_cache(&fcc);
}
/* }}} */

/* {{{ Checks if at least one array element satisfies a callback function. */
PHP_FUNCTION(array_any)
{
  HashTable *array;
  zend_fcall_info fci;
  zend_fcall_info_cache fcc;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_HT(array)
    Z_PARAM_FUNC_NO_TRAMPOLINE_FREE(fci, fcc)
  ZEND_PARSE_PARAMETERS_END();

  RETVAL_BOOL(php_array_find(array, &fcc, NULL, NULL, false) == PHP_ARRAY_FIND_SOME);
  zend_release_fcall_info_cache(&fcc);
}
/* }}} */

/* {{{ Checks if all array elements satisfy a callback function. */
PHP_FUNCTION(array_all)
{
  HashTable *array;
  zend_fcall_info fci;
  zend_fcall_info_cache fcc;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_HT(array)
    Z_PARAM_FUNC_NO_TRAMPOLINE_FREE(fci, fcc)
  ZEND_PARSE_PARAMETERS_END();

  RETVAL_BOOL(php_array_find(array, &fcc, NULL, NULL, true) == PHP_ARRAY_FIND_NONE);
  zend_release_fcall_info_cache(&fcc);
}
/* }}} */

/* {{{ Applies the callback to the elements in given arrays. */
PHP_FUNCTION(array_map)
{
  zval *arrays = NULL;
  uint32_t n_arrays = 0;
  zval result;
  zend_fcall_info fci;
  zend_fcall_info_cache fci_cache;
  uint32_t i;
  uint32_t k, maxlen = 0;

  ZEND_PARSE_PARAMETERS_START(2, -1)
    Z_PARAM_FUNC_OR_NULL(fci, fci_cache)
    Z_PARAM_VARIADIC('+', arrays, n_arrays)
  ZEND_PARSE_PARAMETERS_END();

  if (n_arrays == 1) {
    if (Z_TYPE(arrays[0]) != IS_ARRAY) {
      zend_wrong_parameter_type_error(2, Z_EXPECTED_ARRAY, &arrays[0]);
      RETURN_THROWS();
    }
    const HashTable *input = Z_ARRVAL(arrays[0]);
    maxlen = zend_hash_num_elements(input);

    /* Short-circuit: if no callback and only one array, just return it. */
    if (!ZEND_FCI_INITIALIZED(fci) || !maxlen) {
      ZVAL_COPY(return_value, &arrays[0]);
      return;
    }

    fci.retval = &result;
    fci.param_count = 1;

    if (HT_IS_PACKED(input)) {
      array_init_size(return_value, input->nNumUsed);
      HashTable *output = Z_ARRVAL_P(return_value);
      zend_hash_real_init_packed(output);

      uint32_t undefs = 0;
      ZEND_HASH_FILL_PACKED(output) {
        /* Can't use ZEND_HASH_PACKED_FOREACH_VAL() because we need to also account for the UNDEF values
         * so the keys in the output array will match those of the input array. */
        for (zval *cur = input->arPacked, *end = input->arPacked + input->nNumUsed; cur != end; cur++) {
          if (EXPECTED(!Z_ISUNDEF_P(cur))) {
            fci.params = cur;
            zend_result ret = zend_call_function(&fci, &fci_cache);
            ZEND_ASSERT(ret == SUCCESS);
            ZEND_IGNORE_VALUE(ret);
            if (UNEXPECTED(Z_ISUNDEF(result))) {
              ZEND_HASH_FILL_FINISH();
              RETURN_THROWS();
            }
          } else {
            ZVAL_UNDEF(&result);
            undefs++;
          }
          ZEND_HASH_FILL_ADD(&result);
        }
      } ZEND_HASH_FILL_END();
      output->nNumOfElements -= undefs;
    } else {
      zend_ulong num_key;
      zend_string *str_key;

      array_init_size(return_value, maxlen);
      HashTable *output = Z_ARRVAL_P(return_value);
      zend_hash_real_init_mixed(output);

      ZEND_HASH_MAP_FOREACH_KEY_VAL(input, num_key, str_key, fci.params) {
        zend_result ret = zend_call_function(&fci, &fci_cache);
        ZEND_ASSERT(ret == SUCCESS);
        ZEND_IGNORE_VALUE(ret);
        if (UNEXPECTED(Z_ISUNDEF(result))) {
          RETURN_THROWS();
        }
        if (str_key) {
          _zend_hash_append(output, str_key, &result);
        } else {
          zend_hash_index_add_new(output, num_key, &result);
        }
      } ZEND_HASH_FOREACH_END();
    }
  } else {
    for (i = 0; i < n_arrays; i++) {
      if (Z_TYPE(arrays[i]) != IS_ARRAY) {
        zend_argument_type_error(i + 2, "must be of type array, %s given", zend_zval_value_name(&arrays[i]));
        RETURN_THROWS();
      }
      if (zend_hash_num_elements(Z_ARRVAL(arrays[i])) > maxlen) {
        maxlen = zend_hash_num_elements(Z_ARRVAL(arrays[i]));
      }
    }

    if (!maxlen) {
      RETURN_EMPTY_ARRAY();
    }

    if (UNEXPECTED(!array_finit_size_packed(return_value, maxlen))) {
      RETURN_OOM();
    }

    ZEND_HASH_FILL_PACKED(Z_ARRVAL_P(return_value)) {
      if (!ZEND_FCI_INITIALIZED(fci)) {
        uint32_t *array_pos = ecalloc(n_arrays, sizeof(HashPosition));
        zval zv;

        /* We iterate through all the arrays at once. */
        for (k = 0; k < maxlen; k++) {

          /* If no callback, the result will be an array, consisting of current
           * entries from all arrays. */
          if (ZEND_HAS_OOM()) {
            efree(array_pos);
            RETURN_OOM();
          }
          array_init_size(&result, n_arrays);

          zend_hash_real_init_packed(Z_ARRVAL(result));
          ZEND_HASH_FILL_PACKED(Z_ARRVAL(result)) {
            for (i = 0; i < n_arrays; i++) {
              /* If this array still has elements, add the current one to the
               * parameter list, otherwise use null value. */
              uint32_t pos = array_pos[i];
              if (HT_IS_PACKED(Z_ARRVAL(arrays[i]))) {
                while (1) {
                  if (pos >= Z_ARRVAL(arrays[i])->nNumUsed) {
                    ZEND_HASH_FILL_SET_NULL();
                    break;
                  } else if (Z_TYPE(Z_ARRVAL(arrays[i])->arPacked[pos]) != IS_UNDEF) {
                    ZVAL_COPY(&zv, &Z_ARRVAL(arrays[i])->arPacked[pos]);
                    ZEND_HASH_FILL_SET(&zv);
                    array_pos[i] = pos + 1;
                    break;
                  }
                  pos++;
                }
              } else {
                while (1) {
                  if (pos >= Z_ARRVAL(arrays[i])->nNumUsed) {
                    ZEND_HASH_FILL_SET_NULL();
                    break;
                  } else if (Z_TYPE(Z_ARRVAL(arrays[i])->arData[pos].val) != IS_UNDEF) {
                    ZVAL_COPY(&zv, &Z_ARRVAL(arrays[i])->arData[pos].val);
                    ZEND_HASH_FILL_SET(&zv);
                    array_pos[i] = pos + 1;
                    break;
                  }
                  pos++;
                }
              }
              ZEND_HASH_FILL_NEXT();
            }
          } ZEND_HASH_FILL_END();

          ZEND_HASH_FILL_ADD(&result);
        }

        efree(array_pos);
      } else {
        zval *params = (zval *)safe_emalloc(n_arrays, sizeof(zval), 0);

        /* Remember next starting point in the array, initialize those as zeros. */
        for (i = 0; i < n_arrays; i++) {
          Z_EXTRA(params[i]) = 0;
        }

        fci.retval = &result;
        fci.param_count = n_arrays;
        fci.params = params;

        /* We iterate through all the arrays at once. */
        for (k = 0; k < maxlen; k++) {
          for (i = 0; i < n_arrays; i++) {
            /* If this array still has elements, add the current one to the
             * parameter list, otherwise use null value. */
            uint32_t pos = Z_EXTRA(params[i]);
            if (HT_IS_PACKED(Z_ARRVAL(arrays[i]))) {
              while (1) {
                if (pos >= Z_ARRVAL(arrays[i])->nNumUsed) {
                  ZVAL_NULL(&params[i]);
                  break;
                } else if (Z_TYPE(Z_ARRVAL(arrays[i])->arPacked[pos]) != IS_UNDEF) {
                  ZVAL_COPY_VALUE(&params[i], &Z_ARRVAL(arrays[i])->arPacked[pos]);
                  Z_EXTRA(params[i]) = pos + 1;
                  break;
                }
                pos++;
              }
            } else {
              while (1) {
                if (pos >= Z_ARRVAL(arrays[i])->nNumUsed) {
                  ZVAL_NULL(&params[i]);
                  break;
                } else if (Z_TYPE(Z_ARRVAL(arrays[i])->arData[pos].val) != IS_UNDEF) {
                  ZVAL_COPY_VALUE(&params[i], &Z_ARRVAL(arrays[i])->arData[pos].val);
                  Z_EXTRA(params[i]) = pos + 1;
                  break;
                }
                pos++;
              }
            }
          }

          zend_result ret = zend_call_function(&fci, &fci_cache);
          ZEND_ASSERT(ret == SUCCESS);
          ZEND_IGNORE_VALUE(ret);

          if (Z_TYPE(result) == IS_UNDEF) {
            ZEND_HASH_FILL_FINISH();
            efree(params);
            RETURN_THROWS();
          }

          ZEND_HASH_FILL_ADD(&result);
        }

        efree(params);
      }
    } ZEND_HASH_FILL_END();
  }
}
/* }}} */

/* {{{ Checks if the given key or index exists in the array */
PHP_FUNCTION(array_key_exists)
{
  zval *key;
  HashTable *ht;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ZVAL(key)
    Z_PARAM_ARRAY_HT(ht)
  ZEND_PARSE_PARAMETERS_END();

  switch (Z_TYPE_P(key)) {
    case IS_STRING:
      RETVAL_BOOL(zend_symtable_exists(ht, Z_STR_P(key)));
      break;
    case IS_LONG:
      RETVAL_BOOL(zend_hash_index_exists(ht, Z_LVAL_P(key)));
      break;
    case IS_NULL:
      zend_error(E_DEPRECATED, "Using null as the key parameter for array_key_exists() is deprecated, use an empty string instead");
      RETVAL_BOOL(zend_hash_exists(ht, ZSTR_EMPTY_ALLOC()));
      break;
    case IS_DOUBLE:
      RETVAL_BOOL(zend_hash_index_exists(ht, zend_dval_to_lval_safe(Z_DVAL_P(key))));
      break;
    case IS_FALSE:
      RETVAL_BOOL(zend_hash_index_exists(ht, 0));
      break;
    case IS_TRUE:
      RETVAL_BOOL(zend_hash_index_exists(ht, 1));
      break;
    case IS_RESOURCE:
      zend_use_resource_as_offset(key);
      RETVAL_BOOL(zend_hash_index_exists(ht, Z_RES_HANDLE_P(key)));
      break;
    default:
      zend_argument_type_error(1, "must be a valid array offset type");
      break;
  }
}
/* }}} */

/* {{{ Split array into chunks */
PHP_FUNCTION(array_chunk)
{
  int num_in;
  zend_long size, current = 0;
  zend_string *str_key;
  zend_ulong num_key;
  bool preserve_keys = 0;
  zval *input = NULL;
  zval chunk;
  zval *entry;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_ARRAY(input)
    Z_PARAM_LONG(size)
    Z_PARAM_OPTIONAL
    Z_PARAM_BOOL(preserve_keys)
  ZEND_PARSE_PARAMETERS_END();

  /* Do bounds checking for size parameter. */
  if (size < 1) {
    zend_argument_value_error(2, "must be greater than 0");
    RETURN_THROWS();
  }

  num_in = zend_hash_num_elements(Z_ARRVAL_P(input));

  if (size > num_in) {
    if (num_in == 0) {
      RETURN_EMPTY_ARRAY();
    }
    size = num_in;
  }

  if (UNEXPECTED(!array_finit_size_packed(return_value, (uint32_t)(((num_in - 1) / size) + 1)))) {
    RETURN_OOM();
  }

  if (!preserve_keys) {
    /* Every chunk is a list of exactly `size` elements (the last one possibly
     * shorter), so each one can be filled directly. The input is walked by
     * element pointer, so the packed/hash stride is computed only once. */
    HashTable *ht = Z_ARRVAL_P(input);
    uint32_t elem_size = ZEND_HASH_ELEMENT_SIZE(ht);
    zval *zv = ht->arPacked;
    uint32_t remaining = (uint32_t)num_in;

    while (remaining > 0) {
      uint32_t chunk_size = MIN((uint32_t)size, remaining);

      array_init_size(&chunk, chunk_size);
      zend_hash_real_init_packed(Z_ARRVAL(chunk));
      ZEND_HASH_FILL_PACKED(Z_ARRVAL(chunk)) {
        uint32_t n = 0;
        while (n < chunk_size) {
          entry = zv;
          zv = ZEND_HASH_NEXT_ELEMENT(zv, elem_size);
          if (UNEXPECTED(Z_TYPE_P(entry) == IS_UNDEF)) {
            continue;
          }
          if (UNEXPECTED(Z_ISREF_P(entry)) && Z_REFCOUNT_P(entry) == 1) {
            entry = Z_REFVAL_P(entry);
          }
          Z_TRY_ADDREF_P(entry);
          ZEND_HASH_FILL_ADD(entry);
          n++;
        }
      } ZEND_HASH_FILL_END();
      zend_hash_next_index_insert_new(Z_ARRVAL_P(return_value), &chunk);
      remaining -= chunk_size;
    }
    return;
  }

  ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(input), num_key, str_key, entry) {
    /* If new chunk, create and initialize it. */
    if (current == 0) {
      if (ZEND_HAS_OOM()) {
        RETURN_OOM();
      }
      array_init_size(&chunk, (uint32_t)size);
      add_next_index_zval(return_value, &chunk);
    }

    /* Add entry to the chunk, preserving keys. */
    if (str_key) {
      entry = zend_hash_add_new(Z_ARRVAL(chunk), str_key, entry);
    } else {
      entry = zend_hash_index_add_new(Z_ARRVAL(chunk), num_key, entry);
    }
    zval_add_ref(entry);

    if (++current == size) {
      current = 0;
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* {{{ Creates an array by using the elements of the first parameter as keys and the elements of the second as the corresponding values */
PHP_FUNCTION(array_combine)
{
  HashTable *values, *keys;
  uint32_t pos_values = 0;
  zval *entry_keys, *entry_values;
  int num_keys, num_values;

  ZEND_PARSE_PARAMETERS_START(2, 2)
    Z_PARAM_ARRAY_HT(keys)
    Z_PARAM_ARRAY_HT(values)
  ZEND_PARSE_PARAMETERS_END();

  num_keys = zend_hash_num_elements(keys);
  num_values = zend_hash_num_elements(values);

  if (num_keys != num_values) {
    zend_argument_value_error(1, "and argument #2 ($values) must have the same number of elements");
    RETURN_THROWS();
  }

  if (!num_keys) {
    RETURN_EMPTY_ARRAY();
  }

  array_init_size(return_value, num_keys);
  ZEND_HASH_FOREACH_VAL(keys, entry_keys) {
    while (1) {
      if (pos_values >= values->nNumUsed) {
        break;
      }
      entry_values = ZEND_HASH_ELEMENT(values, pos_values);
      if (Z_TYPE_P(entry_values) != IS_UNDEF) {
        if (Z_TYPE_P(entry_keys) == IS_LONG) {
          entry_values = zend_hash_index_update(Z_ARRVAL_P(return_value),
            Z_LVAL_P(entry_keys), entry_values);
        } else {
          zend_string *tmp_key;
          zend_string *key = zval_get_tmp_string(entry_keys, &tmp_key);
          entry_values = zend_symtable_update(Z_ARRVAL_P(return_value),
            key, entry_values);
          zend_tmp_string_release(tmp_key);
        }
        zval_add_ref(entry_values);
        pos_values++;
        break;
      }
      pos_values++;
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

Coverage Report

Created: 2026-10-28 06:20