(PHP 5, PHP 7)
Can be used to iterate through recursive iterators.
$iterator
[, int $mode
= RecursiveIteratorIterator::LEAVES_ONLY
[, int $flags
= 0
]] )RecursiveIteratorIterator::LEAVES_ONLY
RecursiveIteratorIterator::SELF_FIRST
RecursiveIteratorIterator::CHILD_FIRST
RecursiveIteratorIterator::CATCH_GET_CHILD