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

(PHP 5 >= 5.3.0, PHP 7) Move to the next file

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

(PHP 5 >= 5.1.0, PHP 7) Constructs an InfiniteIterator

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

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

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

(PHP 5 >= 5.3.0, PHP 7) Counts the number of elements in the queue.

(PHP 5 >= 5.1.0, PHP 7) Return the inner iterator's children as a RecursiveCachingIterator

(PHP 5, PHP 7) Check whether the current element is valid