(PHP 5, PHP 7) Apply a user function recursively to every member of an array

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Filters elements of an array using a callback function

(PHP 5 >= 5.1.0, PHP 7) Computes the difference of arrays using keys for comparison

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

(PHP 4, PHP 5, PHP 7) Import variables into the current symbol table from an array

(PHP 4, PHP 5, PHP 7) Apply a user supplied function to every member of an array

(PHP 4, PHP 5, PHP 7) Sort an array in reverse order

(PHP 5 >= 5.1.0, PHP 7) Computes the intersection of arrays using a callback function on the keys for comparison

(PHP 4, PHP 5, PHP 7) Remove a portion of the array and replace it with something else