(PHP 4, PHP 5, PHP 7) Call the callback given by the first parameter

(PHP 5, PHP 7) Gets an array of methods public

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Verify that the contents of a variable can be called as a function

(PHP 5 >= 5.5.0, PHP 7) Returns whether this function is a generator

(PHP 4, PHP 5) Call a user method on an specific object

(PHP 4, PHP 5, PHP 7) Shuffle an array bool shuffle

(PHP 4 >= 4.0.5, PHP 5) Call a user method given with an array of parameters

(PHP 5 >= 5.1.0, PHP 7) Checks if method is defined

(PHP 5, PHP 7) Checks if null is allowed public

(PHP 5 >= 5.3.0, PHP 7) Checks if closure