/**
* Searches the current node list for the position of a specific node.
*
* @param DomNode $subject Node to search for
* @return int Offset of the node starting from 0, or null if the node is
* not found
*/
public function index(DomNode $subject)
{
foreach ($this as $key => $node) {
if ($subject->isSameNode($node)) {
return $key;
}
}
return null;
}
