$firstTitle = $xpath->query("/rss/channel/item/title")->item(0);
$newTitle = $dom->createElement("title");
$newTitle->appendChild(new DOMText("This's the new title text!!!"));
$firstTitle->parentNode->replaceChild($newTitle, $firstTitle);
//修改属性
//$firstTitle = $xpath->query("/rss/channel/item/title")->item(0);
//$firstTitle->setAttribute("orderby", "4");
$dom->save("newfile.xml");
echo "<hr/><a href="newfile.xml">查看newfile.xml</a>";
//下面的代码获得并解析php.net的首页，将返第一个title元素的内容。
/*
$dom->loadHTMLFile("http://www.php.net/");
$title = $dom->getElementsByTagName("title");
print $title->item(0)->textContent;
*/
?>
下面是test.xml文件代码：
<?xml version="1.0" encoding="gb2312"?>
<rss version="2.0">
<channel>
<title>javascript</title>
<link>http://blog.csdn.net/zhongmao/category/29515.aspx</link>
<description>javascript</description>
<language>zh-chs</language>
<generator>.text version 0.958.2004.2001</generator>
<item>
<creator>zhongmao</creator>
<title orderby="1">out put excel used javascript</title>
<link>http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx</link>
<pubdate>wed, 15 sep 2004 13:32:00 gmt</pubdate>
<guid>http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx</guid>
<comment>http://blog.csdn.net/zhongmao/comments/105385.aspx</comment>
<comments>http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx#feedback</comments>
<comments>2</comments>
<commentrss>http://blog.csdn.net/zhongmao/comments/commentrss/105385.aspx</commentrss>
<ping>http://blog.csdn.net/zhongmao/services/trackbacks/105385.aspx</ping>
<description>test description</description>
</item>
<item>
<creator>zhongmao</creator>
<title orderby="2">out put word used javascript</title>
<link>http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx</link>
<pubdate>fri, 06 aug 2004 16:33:00 gmt</pubdate>
<guid>http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx</guid>
<comment>http://blog.csdn.net/zhongmao/comments/67161.aspx</comment>
<comments>http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx#feedback</comments>
<comments>0</comments>
<commentrss>http://blog.csdn.net/zhongmao/comments/commentrss/67161.aspx</commentrss>
<ping>http://blog.csdn.net/zhongmao/services/trackbacks/67161.aspx</ping>
<description>test word description</description>
</item>
<item>
<creator>zhongmao</creator>
