demo_func_simplexml_key.php:
<!DOCTYPE html> <html> <body> <?php $note=<<<XML <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Do not forget me this weekend!</body> </note> XML; $xml = new SimpleXMLIterator($note); // rewind to the first element $xml->rewind(); // return current key var_dump($xml->key()); ?> </body> </html>