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

(PHP 5, PHP 7) Move forward to the next element

(PHP 5, PHP 7) Access the current element value

(PHP 5 >= 5.1.0, PHP 7) End Iteration public

(PHP 5 >= 5.1.0, PHP 7) Get max depth public

(PHP 5, PHP 7) Access the current key public

(PHP 5 >= 5.1.3, PHP 7) Construct a RecursiveIteratorIterator

(PHP 5 >= 5.1.0, PHP 7) Set max depth public