(PHP 5 >= 5.3.0, PHP 7) Checks whether the queue is empty.

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

(PHP 5 >= 5.1.2, PHP 7) Return all registered __autoload() functions

(PHP 5 >= 5.1.2, PHP 7) Gets file permissions

(PHP 5 >= 5.1.0, PHP 7) Return the parent classes of the given class

(PHP 5 >= 5.1.0, PHP 7) Returns the index at which the iterator currently is

(PHP 5 >= 5.1.0, PHP 7) Count elements of an object

(PHP 5 >= 5.1.2, PHP 7) Gets the path without filename

(PHP 5 >= 5.1.3, PHP 7) Construct a RecursiveIteratorIterator

(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry.