Function handling Functions in PHP

Function handling Functions
call_user_func_array — Call a user function given with an array of parameters
call_user_func — Call a user function given by the first parameter
create_function — Create an anonymous (lambda-style) function
forward_static_call_array — Call a static method and pass the arguments as array
forward_static_call — Call a static method
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
get_defined_functions — Returns an array of all defined functions
register_shutdown_function — Register a function for execution on shutdown
register_tick_function — Register a function for execution on each tick
unregister_tick_function — De-register a function for execution on each tick