(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) Call the callback given by the first parameter

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

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Create an anonymous (lambda-style) function

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