PHP Array Functions

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PHP Array Introduction

The array functions allow you to manipulate arrays.

PHP supports both simple and multi-dimensional arrays. There are also specific functions for populating arrays from database queries.


Installation

The array functions are part of the PHP core. There is no installation needed to use these functions.


PHP Array Functions

PHP: indicates the earliest version of PHP that supports the function.

FunctionDescriptionPHP
array()Creates an array3
array_change_key_case()Returns an array with all keys in lowercase or uppercase4
array_chunk()Splits an array into chunks of arrays4
array_combine()Creates an array by using one array for keys and another for its values5
array_count_values()Returns an array with the number of occurrences for each value4
array_diff()Compares array values, and returns the differences4
array_diff_assoc()Compares array keys and values, and returns the differences4
array_diff_key()Compares array keys, and returns the differences5
array_diff_uassoc()Compares array keys and values, with an additional user-made function check, and returns the differences5
array_diff_ukey()Compares array keys, with an additional user-made function check, and returns the differences5
array_fill()Fills an array with values4
array_filter()Filters elements of an array using a user-made function4
array_flip()Exchanges all keys with their associated values in an array4
array_intersect()Compares array values, and returns the matches4
array_intersect_assoc()Compares array keys and values, and returns the matches4
array_intersect_key()Compares array keys, and returns the matches5
array_intersect_uassoc()Compares array keys and values, with an additional user-made function check, and returns the matches5
array_intersect_ukey()Compares array keys, with an additional user-made function check, and returns the matches5
array_key_exists()Checks if the specified key exists in the array4
array_keys()Returns all the keys of an array4
array_map()Sends each value of an array to a user-made function, which returns new values4
array_merge()Merges one or more arrays into one array4
array_merge_recursive()Merges one or more arrays into one array4
array_multisort()Sorts multiple or multi-dimensional arrays4
array_pad()Inserts a specified number of items, with a specified value, to an array4
array_pop()Deletes the last element of an array4
array_product()Calculates the product of the values in an array5
array_push()Inserts one or more elements to the end of an array4
array_rand()Returns one or more random keys from an array4
array_reduce()Returns an array as a string, using a user-defined function4
array_reverse()Returns an array in the reverse order4
array_search()Searches an array for a given value and returns the key4
array_shift()Removes the first element from an array, and returns the value of the removed element4
array_slice()Returns selected parts of an array4
array_splice()Removes and replaces specified elements of an array4
array_sum()Returns the sum of the values in an array4
array_udiff()Compares array values in a user-made function and returns an array5
array_udiff_assoc()Compares array keys, and compares array values in a user-made function, and returns an array5
array_udiff_uassoc()Compares array keys and array values in user-made functions, and returns an array5
array_uintersect()Compares array values in a user-made function and returns an array5
array_uintersect_assoc()Compares array keys, and compares array values in a user-made function, and returns an array5
array_uintersect_uassoc()Compares array keys and array values in user-made functions, and returns an array5
array_unique()Removes duplicate values from an array4
array_unshift()Adds one or more elements to the beginning of an array4
array_values()Returns all the values of an array4
array_walk()Applies a user function to every member of an array3
array_walk_recursive()Applies a user function recursively to every member of an array5
arsort()Sorts an array in reverse order and maintain index association3
asort()Sorts an array and maintain index association3
compact()Create array containing variables and their values4
count()Counts elements in an array, or properties in an object3
current()Returns the current element in an array3
each()Returns the current key and value pair from an array3
end()Sets the internal pointer of an array to its last element3
extract()Imports variables into the current symbol table from an array3
in_array()Checks if a specified value exists in an array4
key()Fetches a key from an array3
krsort()Sorts an array by key in reverse order3
ksort()Sorts an array by key3
list()Assigns variables as if they were an array3
natcasesort()Sorts an array using a case insensitive “natural order” algorithm4
natsort()Sorts an array using a “natural order” algorithm4
next()Advance the internal array pointer of an array3
pos()Alias of current()3
prev()Rewinds the internal array pointer3
range()Creates an array containing a range of elements3
reset()Sets the internal pointer of an array to its first element3
rsort()Sorts an array in reverse order3
shuffle()Shuffles an array3
sizeof()Alias of count()3
sort()Sorts an array3
uasort()Sorts an array with a user-defined function and maintain index association3
uksort()Sorts an array by keys using a user-defined function3
usort()Sorts an array by values using a user-defined function3

 


PHP Array Constants

PHP: indicates the earliest version of PHP that supports the constant.

ConstantDescriptionPHP
CASE_LOWERUsed with array_change_key_case() to convert array keys to lower case
CASE_UPPERUsed with array_change_key_case() to convert array keys to upper case
SORT_ASCUsed with array_multisort() to sort in ascending order
SORT_DESCUsed with array_multisort() to sort in descending order
SORT_REGULARUsed to compare items normally
SORT_NUMERICUsed to compare items numerically
SORT_STRINGUsed to compare items as strings
SORT_LOCALE_STRINGUsed to compare items as strings, based on the current locale4
COUNT_NORMAL
COUNT_RECURSIVE
EXTR_OVERWRITE
EXTR_SKIP
EXTR_PREFIX_SAME
EXTR_PREFIX_ALL
EXTR_PREFIX_INVALID
EXTR_PREFIX_IF_EXISTS
EXTR_IF_EXISTS
EXTR_REFS
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