(PHP 5, PHP 7) Move forward to the next element
(PHP 5 >= 5.1.0, PHP 7) Get children public
(PHP 5, PHP 7) Access the current key public
(PHP 5, PHP 7) Access the current element value
(PHP 5 >= 5.1.0, PHP 7) Set max depth public
(PHP 5 >= 5.1.0, PHP 7) Get max depth public
(PHP 5 >= 5.1.0, PHP 7) End Iteration public
(PHP 5 >= 5.1.3, PHP 7) Construct a RecursiveIteratorIterator
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