(PHP 5 >= 5.1.0, PHP 7) Returns the number of objects in the storage

(PHP 5 >= 5.1.0, PHP 7) Checks if the storage contains a specific object

(PHP 5 >= 5.1.0, PHP 7) Adds an object in the storage

(PHP 5 >= 5.1.0, PHP 7) Returns the current storage entry

(PHP 5 >= 5.1.0, PHP 7) Removes an

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

(PHP 5 >= 5.1.0, PHP 7) Rewind the iterator to the first storage element

(PHP 5 >= 5.3.0, PHP 7) Associates data to an object in the storage

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

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