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

(PHP 5, PHP 7) Invoke public mixed ReflectionMethod::invoke

(PHP 5, PHP 7) Clones function final private

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

(PHP 5, PHP 7) Gets an array of methods public

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

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

(PHP 5, PHP 7) Checks if null is allowed public

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

(PHP 5, PHP 7) Gets a