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

(PHP 5 >= 5.0.3, PHP 7) Gets default parameter value

(PHP 5, PHP 7) To string public string Refle

(PHP >= 5.4.0) To string handler public string

(PHP 5 >= 5.4.6, PHP 7) Returns the default value's constant name if default value is constant or null

(PHP >= 5.4.0) Returns whether this parameter can be passed by value

(PHP 5 >= 5.0.3, PHP 7) Checks if a default value is available

(PHP 5, PHP 7) Gets a

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

(PHP 5, PHP 7) Clone final private void Ref