在PHP5中使用DOM控制XML

2007-12-18

PHP5中增强了XML的支持，使用DOM扩展了XML操作的能耐。这些函数作为 PHP5 核心的一部分，无需被安装即可使用。

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

CODE:

[复制到剪切板]

<?

/************************************************

**                    use XML in PHP5

** reference site:

** http://cn.php.net/manual/zh/ref.dom.php

** the follow codes need PHP5 support

** www.knowsky.com

*************************************************/





//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 "<hr/>取得所有的title元素:<hr/>";

$titles = $dom -> getElementsByTagName("title");

foreach ($titles as $node)

{

  echo $node -> textContent . "<br/>";

  //这样也可以

  //echo $node->firstChild->data . "<br/>";

}



/*

echo "<hr/>从根结点遍历所有结点：<br/>";

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 "<hr/>使用XPath查询的title节点结果:<hr/>";

$xpath = new domxpath($dom);

$titles = $xpath->query("/rss/channel/item/title");

foreach ($titles as $node)

{

  echo $node->textContent."<br/>";

}

/*

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 "<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：

CODE:

[复制到剪切板]

<?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>

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