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

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

(PHP 5, PHP 7) Gets starting line number public

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

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

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

(PHP 5, PHP 7) Gets parameters public array