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

(PHP 5 >= 5.1.0, PHP 7) Parses input from file according to a format

(PHP 5 >= 5.2.0, PHP 7) Sort an array using a case insensitive "natural order" algorithm

(PHP 5 >= 5.3.0, PHP 7) Removes objects contained in another storage from the current storage