(PHP 5 >= 5.2.2, PHP 7) Serializes the storage

(PHP 5 >= 5.3.0, PHP 7) Returns the data associated with the current iterator entry

(PHP 5 >= 5.3.0, PHP 7) Removes an object from the storage

(PHP 5 >= 5.3.0, PHP 7) Returns the data associated with an

(PHP 5 >= 5.3.0, PHP 7) Sets the data associated with the current iterator entry

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

(PHP 5 >= 5.3.6, PHP 7) Removes all objects except for those contained in another storage from the current

(PHP 5 >= 5.1.0, PHP 7) Returns if the current iterator entry is valid

(PHP 5 >= 5.2.2, PHP 7) Unserializes a storage from its string representation

(PHP 5 >= 5.3.0, PHP 7) Adds all objects from another storage