(PHP 4 >= 4.0.1, PHP 5, PHP 7) Merge two or more arrays recursively

(PHP 4, PHP 5, PHP 7) Counts all the values of an array

(PHP 4, PHP 5, PHP 7) Shuffle an array bool shuffle

(PHP 4, PHP 5, PHP 7) Sort an array by keys using a user-defined comparison function

(PHP 4 >= 4.0.5, PHP 5, PHP 7) Iteratively reduce the array to a single value using a callback function

(PHP 4, PHP 5, PHP 7) Sort an array using a case insensitive "natural order" algorithm

(PHP 5, PHP 7) Computes the intersection of arrays with additional index check, compares data by a callback

(PHP 5, PHP 7) Computes the intersection of arrays with additional index check, compares data and indexes by

(PHP 5, PHP 7) Computes the intersection of arrays with additional index check, compares indexes by a callback

(PHP 4, PHP 5, PHP 7) Exchanges all keys with their associated values in an array