(PHP 5 >= 5.1.0, PHP 7) Move to the next entry

(PHP 5 >= 5.1.0, PHP 7) Return the interfaces which are implemented by the given class or interface

(PHP 5 >= 5.1.2, PHP 7) Tells if the file is executable

(PHP 5 >= 5.1.0, PHP 7) Set max depth public