(PHP 4 >= 4.0.3, PHP 5, PHP 7) Register a function for execution on each tick

(PHP 4, PHP 5, PHP 7) Register a function for execution on shutdown

(PHP 4, PHP 5, PHP 7) Returns an array comprising a function's argument list

(PHP 4, PHP 5, PHP 7) Returns the number of arguments passed to the function

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Call a callback with an array of parameters

(PHP 4, PHP 5, PHP 7) Return an item from the argument list

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

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Returns an array of all defined functions

(PHP 4, PHP 5, PHP 7) Return TRUE if the given function has been defined

(PHP 5 >= 5.3.0, PHP 7) Call a static method and pass the arguments as array