DOM is used in PHP5 to control the XML implementation code

The following example is a simple example of how the DOM works with XML. See the comments in the code for more details

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

//The first step is to create a DOMDocument object
$dom = new DomDocument(); 
//Then load the XML file
$dom -> load("test.xml"); 

//Output XML file
//header("Content-type: text/xml;charset=gb2312"); 
//echo $dom -> saveXML(); 

//Save the XML file and return an int (file size, in bytes)
//$dom -> save("newfile.xml"); 

echo "<hr/> Get all of title The element :<hr/>"; 
$titles = $dom -> getElementsByTagName("title"); 
foreach ($titles as $node){ 
echo $node -> textContent . "<br/>"; 
//That's ok
//echo $node->firstChild->data . "<br/>"; 
} 

/* 
echo "<hr/> Traversing all nodes from the root: <br/>"; 
foreach ($dom->documentElement->childNodes as $items) { 
//If the node is an element (nodeType == 1) and the name is item, the loop continues
if ($items->nodeType == 1 && $items->nodeName == "item") { 
foreach ($items->childNodes as $titles) { 
//If the node is an element and the name is title, print it.
if ($titles->nodeType == 1 && $titles->nodeName == "title") { 
print $titles->textContent . "n"; 
} 
} 
} 
} 
*/ 

//Use XPath to query the data
echo "<hr/> use XPath Of the query title Results the node :<hr/>"; 
$xpath = new domxpath($dom); 
$titles = $xpath->query("/rss/channel/item/title"); 
foreach ($titles as $node){ 
echo $node->textContent."<br/>"; 
} 
/* 
 So and use getElementsByTagName() Same way, but Xpath Much stronger  
 A little deeper might look like this:  
/rss/channel/item[position() = 1]/title  Return to the first item All of the elements  
/rss/channel/item/title[@id = '23']  Returns all contains id Property and the value is 23 the title 
/rss/channel/&folder&/title  Returns all articles subelement title( The translator's note: &folder& Represents directory depth ) 
*/ 


//Writes new data to the DOM
$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); 

//Remove the node from the DOM
//$dom->documentElement->RemoveChild($dom->documentElement->getElementsByTagName("channel")->item(0)); 
//Or you can use xpath to query out the nodes and then delete them
//$dom->documentElement->RemoveChild($xpath->query("/rss/channel")->item(0)); 
//$dom->save("newfile.xml"); 

//Modify the node data from the DOM
//Modify the file for the first title
//This is a silly place to create a new node and replace the old one. If any friends have other good methods, please be sure to let me know
$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, $firstTitle); 
//Modify the properties
//$firstTitle = $xpath->query("/rss/channel/item/title")->item(0); 
//$firstTitle->setAttribute("orderby", "4"); 
$dom->save("newfile.xml"); 

echo "<hr/><a href="newfile.xml"> To view newfile.xml</a>"; 

//The following code gets and parses the home page of php.net, returning the contents of the first title element.
/* 
$dom->loadHTMLFile("http://www.php.net/"); 
$title = $dom->getElementsByTagName("title"); 
print $title->item(0)->textContent; 
*/ 
?> 

Here is the code for the test.xml file:

 
<?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>