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

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

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

(PHP 5, PHP 7) Gets parameters public array

(PHP 5 >= 5.1.0, PHP 7) Gets doc comment public

(PHP 5 >= 5.3.0, PHP 7) Gets namespace name

(PHP 7) Checks if the function has a specified return type