(PHP 4 >= 4.0.1, PHP 5, PHP 7) Computes the intersection of arrays

(PHP 4, PHP 5, PHP 7) Unset a given variable

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

(PHP 4, PHP 5, PHP 7) Finds out whether a variable is a boolean

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

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

(PHP 5, PHP 7) Creates an array by using one array for keys and another for its values

(PHP 4, PHP 5, PHP 7) Checks if the object has this class as one of its parents or implements it.

(PHP 5, PHP 7) Export public static string R

(PHP 7) Gets the function name of the generator