(PHP 5 >= 5.3.0, PHP 7) Retrieve the key for the current file

(PHP 5, PHP 7) Return the string representation of the current element

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

(PHP 5 >= 5.3.0, PHP 7) Unserialize public

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

(PHP 5 >= 5.1.0, PHP 7) Forward to the next element

(PHP 5 >= 5.2.0, PHP 7) User defined sort

(PHP 5 >= 5.1.0, PHP 7) Validates the iterator

(PHP 5 >= 5.0.0, PHP 7) Return current array entry

(PHP 5 >= 5.4.0, PHP 7) Create a filtered iterator from another iterator