(PHP 5, PHP 7)
RecursiveIteratorIterator::getSubIterator — The current active sub iterator
public RecursiveIteratorIterator::getSubIterator ([ int $level ] ) : RecursiveIterator
This function is currently not documented; only its argument list is available.
level
The current active sub iterator.
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https://www.php.net/manual/en/recursiveiteratoriterator.getsubiterator.php