(PHP 5, PHP 7) Checks if passed by reference

(PHP 5 >= 5.0.3, PHP 7) Checks if optional

(PHP 5, PHP 7) Gets parameter name public string

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

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

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

(PHP 7) Checks if parameter has a type public

(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 >= 5.1.0, PHP 7) Checks if parameter expects an array