Online PHP editor | refs for jQifI

<?php $dom = new DOMDocument(); $dom->loadXml('<foo><bar/><bar/></foo>'); var_dump(isset($dom->documentElement->parentNode), get_class($dom->documentElement->parentNode)); var_dump(isset($dom->documentElement->firstChild->parentNode), get_class($dom->documentElement->firstChild->parentNode)); var_dump(isset($dom->documentElement->firstChild->nextSibling), get_class($dom->documentElement->firstChild->nextSibling)); var_dump(isset($dom->documentElement->lastChild->previousSibling), get_class($dom->documentElement->lastChild->previousSibling));