(PHP 5, PHP 7, PHP 8)
再帰的なイテレータの反復処理に使用します。
$iterator, int $mode = RecursiveIteratorIterator::LEAVES_ONLY, int $flags = 0)RecursiveIteratorIterator::LEAVES_ONLYRecursiveIteratorIterator::SELF_FIRSTRecursiveIteratorIterator::CHILD_FIRSTRecursiveIteratorIterator::CATCH_GET_CHILD