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These functions allow you to interact with and manipulate
arrays in various ways. Arrays are essential for storing,
managing, and operating on sets of variables.
Simple and multidimensional arrays are supported, and may be
either user created or created by another function.
There are specific database handling functions for populating
arrays from database queries, and several functions return arrays.
Please see the Arrays
section of the manual for a detailed explanation of how arrays are
implemented and used in PHP.
See also Array operators
for other ways how to manipulate the arrays.
No external libraries are needed to build this extension.
There is no installation needed to use these
functions; they are part of the PHP core.
This extension has no configuration directives defined in php.ini
.
This extension has no resource types defined.
The constants below are always available as part of the PHP core.
Sorting order flags:

SORT_ASC
(integer)

SORT_ASC
is used with
array_multisort() to sort in ascending order.

SORT_DESC
(integer)

SORT_DESC
is used with
array_multisort() to sort in descending order.
Sorting type flags: used by various sort functions

SORT_REGULAR
(integer)

SORT_REGULAR
is used to compare items normally.

SORT_NUMERIC
(integer)

SORT_NUMERIC
is used to compare items numerically.

SORT_STRING
(integer)

SORT_STRING
is used to compare items as strings.

SORT_LOCALE_STRING
(integer)

SORT_LOCALE_STRING
is used to compare items as
strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2.

COUNT_NORMAL
(integer)


COUNT_RECURSIVE
(integer)


EXTR_OVERWRITE
(integer)


EXTR_SKIP
(integer)


EXTR_PREFIX_SAME
(integer)


EXTR_PREFIX_ALL
(integer)


EXTR_PREFIX_INVALID
(integer)


EXTR_PREFIX_IF_EXISTS
(integer)


EXTR_IF_EXISTS
(integer)


EXTR_REFS
(integer)

Table of Contents
 array_change_key_case — Changes all keys in an array
 array_chunk — Split an array into chunks
 array_combine — Creates an array by using one array for keys and another for its values
 array_count_values — Counts all the values of an array
 array_diff_assoc — Computes the difference of arrays with additional index check
 array_diff_key — Computes the difference of arrays using keys for comparison
 array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function
 array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison
 array_diff — Computes the difference of arrays
 array_fill_keys — Fill an array with values, specifying keys
 array_fill — Fill an array with values
 array_filter — Filters elements of an array using a callback function
 array_flip — Exchanges all keys with their associated values in an array
 array_intersect_assoc — Computes the intersection of arrays with additional index check
 array_intersect_key — Computes the intersection of arrays using keys for comparison
 array_intersect_uassoc — Computes the intersection of arrays with additional index check, compares indexes by a callback function
 array_intersect_ukey — Computes the intersection of arrays using a callback function on the keys for comparison
 array_intersect — Computes the intersection of arrays
 array_key_exists — Checks if the given key or index exists in the array
 array_keys — Return all the keys of an array
 array_map — Applies the callback to the elements of the given arrays
 array_merge_recursive — Merge two or more arrays recursively
 array_merge — Merge one or more arrays
 array_multisort — Sort multiple or multidimensional arrays
 array_pad — Pad array to the specified length with a value
 array_pop — Pop the element off the end of array
 array_product — Calculate the product of values in an array
 array_push — Push one or more elements onto the end of array
 array_rand — Pick one or more random entries out of an array
 array_reduce — Iteratively reduce the array to a single value using a callback function
 array_reverse — Return an array with elements in reverse order
 array_search — Searches the array for a given value and returns the corresponding key if successful
 array_shift — Shift an element off the beginning of array
 array_slice — Extract a slice of the array
 array_splice — Remove a portion of the array and replace it with something else
 array_sum — Calculate the sum of values in an array
 array_udiff_assoc — Computes the difference of arrays with additional index check, compares data by a callback function
 array_udiff_uassoc — Computes the difference of arrays with additional index check, compares data and indexes by a callback function
 array_udiff — Computes the difference of arrays by using a callback function for data comparison
 array_uintersect_assoc — Computes the intersection of arrays with additional index check, compares data by a callback function
 array_uintersect_uassoc — Computes the intersection of arrays with additional index check, compares data and indexes by a callback functions
 array_uintersect — Computes the intersection of arrays, compares data by a callback function
 array_unique — Removes duplicate values from an array
 array_unshift — Prepend one or more elements to the beginning of an array
 array_values — Return all the values of an array
 array_walk_recursive — Apply a user function recursively to every member of an array
 array_walk — Apply a user function to every member of an array
 array — Create an array
 arsort — Sort an array in reverse order and maintain index association
 asort — Sort an array and maintain index association
 compact — Create array containing variables and their values
 count — Count elements in an array, or properties in an object
 current — Return the current element in an array
 each — Return the current key and value pair from an array and advance the array cursor
 end — Set the internal pointer of an array to its last element
 extract — Import variables into the current symbol table from an array
 in_array — Checks if a value exists in an array
 key — Fetch a key from an associative array
 krsort — Sort an array by key in reverse order
 ksort — Sort an array by key
 list — Assign variables as if they were an array
 natcasesort — Sort an array using a case insensitive "natural order" algorithm
 natsort — Sort an array using a "natural order" algorithm
 next — Advance the internal array pointer of an array
 pos — Alias of current()
 prev — Rewind the internal array pointer
 range — Create an array containing a range of elements
 reset — Set the internal pointer of an array to its first element
 rsort — Sort an array in reverse order
 shuffle — Shuffle an array
 sizeof — Alias of count()
 sort — Sort an array
 uasort — Sort an array with a userdefined comparison function and maintain index association
 uksort — Sort an array by keys using a userdefined comparison function
 usort — Sort an array by values using a userdefined comparison function