(PHP 4, PHP 5, PHP 7) Merge one or more arrays

(PHP 4, PHP 5, PHP 7) Checks if a value exists in an array

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Alias of

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

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

(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 with additional index check, compares data by a callback function

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

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