(PHP 5 >= 5.1.0, PHP 7) Call a function for every element in an iterator

(PHP 5 >= 5.4.0, PHP 7) Calculate a unique identifier for the contained objects

(PHP 5 >= 5.1.2, PHP 7) Unregister given function as __autoload() implementation

(PHP 5 >= 5.1.0, PHP 7) Move the iterator forward

(PHP 5 >= 5.4.0, PHP 7) Unserializes the storage

(PHP 5 >= 5.2.0, PHP 7) Sort entries using a "natural order" algorithm

(PHP 5 >= 5.3.0, PHP 7) Rewinds all attached iterator instances

(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry if it is a directory

(PHP 5 >= 5.3.0, PHP 7) Sets the value at the specified $index to $newval

(PHP 5 >= 5.3.0, PHP 7) Constructs a new empty heap