I'am locate error! :-)

Look this source code:
test.php
===========
<?
function a()
{
		$xml = new COM("Msxml2.DOMDocument.4.0") or die("Can't instance Microsoft.XMLDOM");
		$xml->async = false;

		$isXmlLoaded = $xml->load("D:\\Inetpub\\wwwroot 333\\mail\\test.xml");

		if (!$isXmlLoaded) {
			die("Can't load XML");
		}

		$items = $xml->selectNodes('//item');

		//echo $items->length;\/
		for ($i=0;$i<$items->length;$i++)
		{

			$item = &$items->item($i);

			getAttribute($item,"att");
			echo "Ok!";flush();
			getAttribute($item,"nonexistenceattributename");
			echo "OK?";flush();
			echo "<BR>";
		}

}


function getAttribute(&$node,$name)
{
	$attrib = $node->attributes->getNamedItem($name);
	$value = $attrib->nodeValue;
	return $value;
}

a();
?>
===========

test.xml
===========
<?xml version="1.0"?>

<content>
	<item att="test"/>
</content>
===========

Error appear when i'am try to get attribute by name for no existence attribute.

I hope, that my bug-example help you locate bug.

And one question: how i can query interface IXMLDOMElement in PHP for IXMLDOMNode element?