XXIII. Function Handling functions

These functions all handle various operations involved in working with functions.

Table of Contents
call_user_func — Call a user function given by the first parameter
create_function — Create an anonymous (lambda-style) function
func_get_arg — Return an item from the argument list
func_get_args — Returns an array comprising a function's argument list
func_num_args — Returns the number of arguments passed to the function
function_exists — Return true if the given function has been defined
register_shutdown_function — Register a function for execution on shutdown