PHP 5 Array Functions

The following section contains a list of useful PHP array functions.

PHP Array Functions

The following array functions are the part of the PHP core so you can use these functions within your script without any further installation

Function	Description
array()	Create an array
array_change_key_case()	Changes the case of all keys in an array (either lowercase or uppercase)
array_chunk()	Split an array into chunks of arrays
array_column()	Return the values from a single column in the input array
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()	Compare arrays values, and returns the differences
array_diff_assoc()	Compare arrays keys and values, and returns the differences
array_diff_key()	Compare arrays keys, and returns the differences
array_diff_uassoc()	Compare arrays keys and values, using a user-defined key comparison function, and returns the differences
array_diff_ukey()	Compare array keys, using a user-defined key comparison function, and returns the differences
array_fill()	Fill an array with values
array_fill_keys()	Fill an array with values, specifying keys
array_filter()	Filters elements of an array using a user-defined function
array_flip()	Flips or Exchanges all keys with their associated values in an array
array_intersect()	Compare arrays values, and returns the matches
array_intersect_assoc()	Compare arrays keys and values, and returns the matches
array_intersect_key()	Compare arrays keys, and returns the matches
array_intersect_uassoc()	Compare arrays keys and values, using a user-defined key comparison function, and returns the matches
array_intersect_ukey()	Compare arrays keys, using a user-defined key comparison function, and returns the matches
array_keys()	Return all the keys or a subset of the keys of an array
array_key_exists()	Checks if the specified key exists in the array
array_map()	Sends the elements of the given arrays to a user-defined function, which may use it to returns new values
array_merge()	Merges one or more arrays into one array
array_merge_recursive()	Merges one or more arrays into one array recursively
array_multisort()	Sorts multiple or multi-dimensional arrays
array_pad()	Inserts a specified number of items, with a specified value, to an array
array_pop()	Removes the last element of an array, and returns the value of the removed element
array_product()	Calculates the product of the values in an array
array_push()	Inserts one or more elements to the end of an array
array_rand()	Returns one or more random keys from an array
array_reduce()	Reduce the array to a single value by using a user-defined callback function
array_replace()	Replaces the values of the first array with the values from following arrays
array_replace_recursive()	Replaces the values of the first array with the values from following arrays recursively
array_reverse()	Return an array with elements in reverse order
array_search()	Searches an array for a given value and returns the corresponding key if successful
array_shift()	Removes the first element from an array, and returns the value of the removed element
array_slice()	Extract a slice from an 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()	Compares only arrays values by using a user-defined comparison callback function, and returns the differences
array_udiff_assoc()	Compares arrays values by using a user-defined comparison callback function, with additional keys comparison using an internal (or built-in) function, and returns the differences
array_udiff_uassoc()	Compares arrays keys and values by using two separate user-defined comparison callback functions, and returns the differences
array_uintersect()	Compares only arrays values by using a user-defined comparison callback function, and returns the matches
array_uintersect_assoc()	Compares arrays values by using a user-defined comparison callback function, while uses an internal (or built-in) function for comparing the key, and returns the matches
array_uintersect_uassoc()	Compares arrays keys and values by using two separate user-defined comparison callback functions, and returns the matches
array_unique()	Removes duplicate values from an array
array_unshift()	Adds one or more elements to the beginning of an array
array_values()	Return all the values of an array
array_walk()	Applies a user-defined function to each element of an array
array_walk_recursive()	Applies a user-defined function recursively to each element of an array
asort()	Sort an associative array by value, in ascending order
arsort()	Sort an associative array by value, in reverse or descending order
compact()	Create array containing variables and their values
count()	Count all elements in an array
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()	Sets 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_exists()	Checks if the specified key exists in the array. Alias of array_key_exists()
key()	Fetches a key from an array
ksort()	Sort an associative array by key, in ascending order
krsort()	Sort an associative array by key, in reverse or descending order
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()	Return the current element in an array. 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 or descending order
shuffle()	Shuffle an array
sizeof()	Count all elements in an array. Alias of count()
sort()	Sort an array in ascending order
uasort()	Sort an array using a user-defined comparison function and maintain index association
uksort()	Sort an array by keys using a user-defined comparison function
usort()	Sort an array by values using a user-defined comparison function