(PHP 4 >= 4.2.0, PHP 5, PHP 7) Changes the case of all keys in an array

(PHP 4 >= 4.0.7, PHP 5, PHP 7) Checks if the given key or index exists in the array

(PHP 5, PHP 7) Computes the difference of arrays by using a callback function for data comparison

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Fill an array with values

(PHP 4, PHP 5, PHP 7) Sort multiple or multi-dimensional arrays

(PHP 5 >= 5.3.0, PHP 7) Replaces elements from passed arrays into the first array recursively

(PHP 4, PHP 5, PHP 7) Set the internal pointer of an array to its last element

(PHP 4, PHP 5, PHP 7) Pick one or more random entries out of an array

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