(PHP >= 5.4.0) Returns this pointer bound to closure

(PHP 5, PHP 7) To string abstract public void

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

(PHP 5, PHP 7) Checks if is internal public bool

(PHP 5 >= 5.3.0, PHP 7) Checks if function in namespace

(PHP 5, PHP 7) Checks if deprecated public bool

(PHP 5, PHP 7) Checks if returns reference public

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

(PHP 5, PHP 7) Clones function final private

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