(PHP 5 >= 5.3.0, PHP 7) Check whether the queue contains more nodes

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

(PHP 5 >= 5.1.0, PHP 7) Gets the iterator classname for the ArrayObject.

(PHP 5, PHP 7) Return available SPL classes array

(PHP 5 >= 5.3.0, PHP 7) Sets the value at the specified $index to $newval

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

(PHP 5 >= 5.5.0, PHP 7) Add/insert a new value at the specified index

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

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

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