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

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

(PHP 5 >= 5.3.0, PHP 7) Returns whether the requested index exists

(PHP 5 >= 5.3.0, PHP 7) Get the number of directories and files

(PHP 5 >= 5.1.0, PHP 7) Seek to specified line

(PHP 5 >= 5.3.0, PHP 7) Get current element

(PHP 5 >= 5.0.0, PHP 7) Returns whether the requested index exists

(PHP 5 >= 5.3.6, PHP 7) Gets the file extension

(PHP 5 >= 5.3.0, PHP 7) Seek to a DirectoryIterator item

(PHP 5 >= 5.0.0, PHP 7) Count elements public