PHP5中使用DOM控制XML实现代码

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下面的例子简单的演示了DOM对XML的操作,详细解释请看代码中的注释
<div class="codetitle"><a style="CURSOR: pointer" data="10068" class="copybut" id="copybut10068" onclick="doCopy('code10068')"> 代码如下:

<div class="codebody" id="code10068">
<?
/****
use XML in PHP5
reference site:
http://cn.PHP.net/manual/zh/ref.dom.PHP
the follow codes need PHP5 support
*****/ //首先要创建一个DOMDocument对象
$dom = new DomDocument();
//然后载入XML文件
$dom -> load("test.xml"); //输出XML文件
//header("Content-type: text/xml;charset=gb2312");
//echo $dom -> saveXML(); //保存XML文件,返回值为int(文件大小,以字节为单位)
//$dom -> save("newfile.xml"); echo "
取得所有的title元素:
";
$titles = $dom -> getElementsByTagName("title");
foreach ($titles as $node){
echo $node -> textContent . "
";
//这样也可以
//echo $node->firstChild->data . "
";
} /
echo "
从根结点遍历所有结点:
";
foreach ($dom->documentElement->childNodes as $items) {
//如果节点是一个元素(nodeType == 1)并且名字是item就继续循环
if ($items->nodeType == 1 && $items->nodeName == "item") {
foreach ($items->childNodes as $titles) {
//如果节点是一个元素,并且名字是title就打印它.
if ($titles->nodeType == 1 && $titles->nodeName == "title") {
print $titles->textContent . "\n";
}
}
}
}
/ //使用XPath查询数据
echo "
使用XPath查询的title节点结果:
";
$xpath = new domxpath($dom);
$titles = $xpath->query("/RSS/channel/item/title");
foreach ($titles as $node){
echo $node->textContent."
";
}
/
这样和使用getElementsByTagName()方法差不多,但是Xpath要强大的多
深入一点可能是这样:
/RSS/channel/item[position() = 1]/title 返回第一个item元素的所有
/RSS/channel/item/title[@id = '23'] 返回所有含有id属性并且值为23的title
/RSS/channel/&folder&/title 返回所有articles元素下面的title(译者注:&folder&代表目录深度)
/
//向DOM中写入新数据
$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); //从DOM中删除节点
//$dom->documentElement->RemoveChild($dom->documentElement->getElementsByTagName("channel")->item(0));
//或者使用xpath查询出节点再删除
//$dom->documentElement->RemoveChild($xpath->query("/RSS/channel")->item(0));
//$dom->save("newfile.xml"); //从DOM中修改节点数据
//修改第一个title的文件
//这个地方比较笨,新创建一个节点,然后替换旧的节点。如果哪位朋友有其他好的方法请一定要告诉我
$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,$firstTitle);
//修改属性
//$firstTitle = $xpath->query("/RSS/channel/item/title")->item(0);
//$firstTitle->setAttribute("orderby","4");
$dom->save("newfile.xml"); echo "
<a href=\"newfile.xml\">查看newfile.xml"; //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:
<div class="codetitle"><a style="CURSOR: pointer" data="1782" class="copybut" id="copybut1782" onclick="doCopy('code1782')"> 代码如下:
<div class="codebody" id="code1782">
<?xml version="1.0" encoding="gb2312"?>
<RSS version="2.0">

javascript
http://blog.csdn.net/zhongmao/category/29515.aspx
javascript
zh-chs
.text version 0.958.2004.2001

zhongmao
<title orderby="1">out put excel used javascript
http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx
wed,15 sep 2004 13:32:00 gmt
http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx
http://blog.csdn.net/zhongmao/comments/105385.aspx
http://blog.csdn.net/zhongmao/archive/2004/09/15/105385.aspx#Feedback
2
http://blog.csdn.net/zhongmao/comments/commentRSS/105385.aspx
http://blog.csdn.net/zhongmao/services/trackbacks/105385.aspx
test description


zhongmao
<title orderby="2">out put word used javascript
http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx
fri,06 aug 2004 16:33:00 gmt
http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx
http://blog.csdn.net/zhongmao/comments/67161.aspx
http://blog.csdn.net/zhongmao/archive/2004/08/06/67161.aspx#Feedback
0
http://blog.csdn.net/zhongmao/comments/commentRSS/67161.aspx
http://blog.csdn.net/zhongmao/services/trackbacks/67161.aspx
test word description


zhongmao
<title orderby="3">xmlhttp
http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx
mon,02 aug 2004 10:11:00 gmt
http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx
http://blog.csdn.net/zhongmao/comments/58417.aspx
http://blog.csdn.net/zhongmao/archive/2004/08/02/58417.aspx#Feedback
0
http://blog.csdn.net/zhongmao/comments/commentRSS/58417.aspx
http://blog.csdn.net/zhongmao/services/trackbacks/58417.aspx
xmlhttpaaa asd bb cc dd



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