PHP5中增強了XML的支持，使用DOM擴展了XML操作的能耐。這些函數(shù)作為 PHP5 核心的一部分，無需被安裝即可使用。

下面的例子簡單的演示了DOM對XML的操作，詳細解釋請看代碼中的注釋

<?/**************************************************;use XML in PHP5** reference site:** http://cn.php.net/manual/zh/ref.dom.php** the follow codes need PHP5 support** www.mypchelp.cn*************************************************/

//首先要創(chuàng)建一個DOMDocument對象$dom = new DomDocument();//然后載入XML文件$dom -> load('test.xml');

//輸出XML文件//header('Content-type: text/xml;charset=gb2312');//echo $dom -> saveXML();

//保存XML文件，返回值為int（文件大小，以字節(jié)為單位）//$dom -> save('newfile.xml');

echo '<hr/>取得所有的title元素:<hr/>';$titles = $dom -> getElementsByTagName('title');foreach ($titles as $node){ echo $node -> textContent . '<br/>'; //這樣也可以 //echo $node->firstChild->data . '<br/>';}

/*echo '<hr/>從根結點遍歷所有結點：<br/>';foreach ($dom->documentElement->childNodes as $items) { //如果節(jié)點是一個元素(nodeType == 1)并且名字是item就繼續(xù)循環(huán) if ($items->nodeType == 1 && $items->nodeName == 'item') { foreach ($items->childNodes as $titles) { //如果節(jié)點是一個元素，并且名字是title就打印它. if ($titles->nodeType == 1 && $titles->nodeName == 'title') { print $titles->textContent . 'n'; } } } } */

//使用XPath查詢數(shù)據(jù)echo '<hr/>使用XPath查詢的title節(jié)點結果:<hr/>';$xpath = new domxpath($dom);$titles = $xpath->query('/rss/channel/item/title');foreach ($titles as $node){ echo $node->textContent.'<br/>';}/*這樣和使用getElementsByTagName()方法差不多，但是Xpath要強大的多深入一點可能是這樣：/rss/channel/item[position() = 1]/title 返回第一個item元素的所有 /rss/channel/item/title[@id = '23'] 返回所有含有id屬性并且值為23的title /rss/channel/&folder&/title 返回所有articles元素下面的title(譯者注：&folder&代表目錄深度)*/

//向DOM中寫入新數(shù)據(jù)$item = $dom->createElement('item');$title = $dom->createElement('title');$titleText = $dom->createTextNode('title text');$title->appendChild($titleText);$item->appendChild($title);$dom->documentElement->getElementsByTagName('channel')->item(0)->appendChild($item);

//從DOM中刪除節(jié)點//$dom->documentElement->RemoveChild($dom->documentElement->getElementsByTagName('channel')->item(0));//或者使用xpath查詢出節(jié)點再刪除//$dom->documentElement->RemoveChild($xpath->query('/rss/channel')->item(0));//$dom->save('newfile.xml');

//從DOM中修改節(jié)點數(shù)據(jù)//修改第一個title的文件//這個地方比較笨，新創(chuàng)建一個節(jié)點，然后替換舊的節(jié)點。如果哪位朋友有其他好的方法請一定要告訴我$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, $firstTitle);//修改屬性//$firstTitle = $xpath->query('/rss/channel/item/title')->item(0);//$firstTitle->setAttribute('orderby', '4');$dom->save('newfile.xml');

echo '<hr/><a href='http://m.propowerdrill.cn/bcjs/newfile.xml'>查看newfile.xml</a>';

//下面的代碼獲得并解析php.net的首頁，將返第一個title元素的內(nèi)容。/*$dom->loadHTMLFile('http://www.php.net/'); $title = $dom->getElementsByTagName('title'); print $title->item(0)->textContent;*/?>

下面是test.xml文件代碼：

<?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><title orderby='3'>xmlhttp</title><link>http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx</link><pubdate>mon, 02 aug 2004 10:11:00 gmt</pubdate><guid>http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx</guid><comment>http://blog.csdn.net/zhongmao/comments/58417.aspx</comment><comments>http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx#feedback</comments><comments>0</comments><commentrss>http://blog.csdn.net/zhongmao/comments/commentrss/58417.aspx</commentrss><ping>http://blog.csdn.net/zhongmao/services/trackbacks/58417.aspx</ping><description>xmlhttpaaa asd bb cc dd</description></item></channel></rss>