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

(PHP 4, PHP 5, PHP 7) Alias of

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

(PHP 4, PHP 5, PHP 7) Push one or more elements onto the end of array

(PHP 4, PHP 5, PHP 7) Sort an array and maintain index association

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

(PHP 4, PHP 5, PHP 7) Sort an array in reverse order and maintain index association

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

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

(PHP 4, PHP 5, PHP 7) Rewind the internal array pointer