php xml xpath 很好用

	$dom = new DOMdocument('1.0','utf-8');
	$dom->load('./dictionary.xml');
	$xpath= new DOMXPATH($dom);
	header('Content-type:text/html;charset=utf-8');

	$query = '/haou_dict/DicEn[Name="programmer"]/Content';
	
	$res= $xpath->query($query);
	if($res->length)
	{
		for ($i=0; $i < $res->length ; $i++) { 
			echo $res->item($i)->nodeValue.'
';
		}
	}
	else
	{
		echo  'sorry';
	}

一共36672个单词的xml文件(3M多),0.38秒就能查出来,很快!