Using DOM to control XML implementation code in PHP5_PHP tutorial

The following example simply demonstrates the operation of DOM on XML. For detailed explanation, please see the comments in the code

<? 
/************************************************ 
** 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 "<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 = &#39;23&#39;] 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); 
$dom->documentElement->getElementsByTagName(&#39;channel&#39;)->item(0)->appendChild($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&#39;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; 
*/ 
?>

The following is the test.xml file code:

<?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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