Online PHP editor | output for RbvZX

<?php class MyElement extends DOMElement { } // #1 - okay $dom = new DOMDocument(); $e = new MyElement("e"); $dom->appendChild($e); echo get_class($dom->childNodes->item(0)) . "\n"; // #2 - wrong $dom = new DOMDocument(); $dom->appendChild(new MyElement("e")); echo get_class($dom->childNodes->item(0)) . "\n"; // #3 - wrong $dom = new DOMDocument(); $e = new MyElement("e"); $dom->appendChild($e); echo get_class($dom->childNodes->item(0)) . "\n"; $e = null; echo get_class($dom->childNodes->item(0)) . "\n";