PHP Array Functions Reference Guide

array()

Creates an array

array_change_key_case()

Changes all keys in an array to lowercase or uppercase

array_chunk()

Splits an array into chunks of arrays

array_column()

Returns the values from a single column in the input array

array_combine()

Creates an array by using the elements from one "keys" array and one "values" array

array_count_values()

Counts all the values of an array

array_diff()

Compare arrays, and returns the differences (compare values only)

array_diff_assoc()

Compare arrays, and returns the differences (compare keys and values)

array_diff_key()

Compare arrays, and returns the differences (compare keys only)

array_diff_uassoc()

Compare arrays, and returns the differences (compare keys and values, using a user-defined key comparison function)

array_diff_ukey()

Compare arrays, and returns the differences (compare keys only, using a user-defined key comparison function)

array_fill()

Fills an array with values

array_fill_keys()

Fills an array with values, specifying keys

array_filter()

Filters the values of an array using a callback function

array_flip()

Flips/Exchanges all keys with their associated values in an array

array_intersect()

Compare arrays, and returns the matches (compare values only)

array_intersect_assoc()

Compare arrays and returns the matches (compare keys and values)

array_intersect_key()

Compare arrays, and returns the matches (compare keys only)

array_intersect_uassoc()

Compare arrays, and returns the matches (compare keys and values, using a user-defined key comparison function)

array_intersect_ukey()

Compare arrays, and returns the matches (compare keys only, using a user-defined key comparison function)

array_key_exists()

Checks if the specified key exists in the array

array_keys()

Returns all the keys of an array

array_map()

Sends each value of an array to a user-made function, which 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()

Deletes the last element of an array

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()

Returns an array as a string, using a user-defined 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()

Returns an array in the reverse order

array_search()

Searches an array for a given value and returns the key

array_shift()

Removes the first element from an array, and returns the value of the removed element

array_slice()

Returns selected parts of an array

array_splice()

Removes and replaces specified elements of an array

array_sum()

Returns the sum of the values in an array

array_udiff()

Compare arrays, and returns the differences (compare values only, using a user-defined key comparison function)

array_udiff_assoc()

Compare arrays, and returns the differences (compare keys and values, using a built-in function to compare the keys and a user-defined function to compare the values)

array_udiff_uassoc()

Compare arrays, and returns the differences (compare keys and values, using two user-defined key comparison functions)

array_uintersect()

Compare arrays, and returns the matches (compare values only, using a user-defined key comparison function)

array_uintersect_assoc()

Compare arrays, and returns the matches (compare keys and values, using a built-in function to compare the keys and a user-defined function to compare the values)

array_uintersect_uassoc()

Compare arrays, and returns the matches (compare keys and values, using two user-defined key comparison functions)

array_unique()

Removes duplicate values from an array

array_unshift()

Adds one or more elements to the beginning of an array

array_values()

Returns all the values of an array

array_walk()

Applies a user function to every member of an array

array_walk_recursive()

Applies a user function recursively to every member of an array

arsort()

Sorts an associative array in descending order, according to the value

asort()

Sorts an associative array in ascending order, according to the value

compact()

Create array containing variables and their values

count()

Returns the number of elements in an array

current()

Returns the current element in an array

each()

Returns the current key and value pair from an array

end()

Sets the internal pointer of an array to its last element

usort()

Sorts an array using a user-defined comparison function