(PHP 5 >= 5.1.0, PHP 7) Get inner iterator

(PHP 5 >= 5.1.0, PHP 7) Get children public

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

(PHP 5 >= 5.1.0, PHP 7) Seeks to a position

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

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

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

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

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

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