(PHP >= 5.4.0) Clone handler final private

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

(PHP 5, PHP 7) Gets the interfaces public array

(PHP 5, PHP 7) Clones function final private

(PHP >= 5.4.0) Returns a dynamically created closure for the function

(PHP >= 5.4.0) Gets version public string

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

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

(PHP 5 >= 5.0.3, PHP 7) Gets number of parameters

(PHP 5 >= 5.6.0, PHP 7) Checks if the function is variadic