(PHP 5 >= 5.2.0, PHP 7) Sort the entries by key

(PHP 5 >= 5.1.2, PHP 7) Sets the class used with

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

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

(PHP 5 >= 5.2.0, PHP 7) Sort the entries by keys using a user-defined comparison function

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

(PHP 5 >= 5.3.0, PHP 7) Peeks at the node from the beginning of the doubly linked list

(PHP 5 >= 5.1.2, PHP 7) Gets the path to the file

(PHP 5 >= 5.3.0, PHP 7) Pops a node from the end of the doubly linked list

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