Using DOM to control XML implementation code in PHP5

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<title>javascript Tutorials </title>
<link>http://blog.111cn.net/zhongmao/category/29515.asp Tutorial X</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.111cn.net/zhongmao/archive/2004/09/15/105385.aspx</link>
<pubdate>wed, Sep 13:32:00 gmt</pubdate>
<guid>http://blog.111cn.net/zhongmao/archive/2004/09/15/105385.aspx</guid>
<comment>http://blog.111cn.net/zhongmao/comments/105385.aspx</comment>
<comments>http://blog.111cn.net/zhongmao/archive/2004/09/15/105385.aspx#feedback</comments>
<comments>2</comments>
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<ping>http://blog.111cn.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.111cn.net/zhongmao/archive/2004/08/06/67161.aspx</link>
<pubdate>fri, Aug 16:33:00 gmt</pubdate>
<guid>http://blog.111cn.net/zhongmao/archive/2004/08/06/67161.aspx</guid>
<comment>http://blog.111cn.net/zhongmao/comments/67161.aspx</comment>
<comments>http://blog.111cn.net/zhongmao/archive/2004/08/06/67161.aspx#feedback</comments>
<comments>0</comments>
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<description>test Word description</description>
</item>
<item>
<creator>zhongmao</creator>
<title orderby= "3" >xmlhttp</title>
<link>http://blog.111cn.net/zhongmao/archive/2004/08/02/58417.aspx</link>
<pubdate>mon, Aug 10:11:00 gmt</pubdate>
<guid>http://blog.111cn.net/zhongmao/archive/2004/08/02/58417.aspx</guid>
<comment>http://blog.111cn.net/zhongmao/comments/58417.aspx</comment>
<comments>http://blog.111cn.net/zhongmao/archive/2004/08/02/58417.aspx#feedback</comments>
<comments>0</comments>
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<description>xmlhttpaaa ASD bb cc dd</description>
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?

First, you 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 an XML file with a return value of int (file size, in bytes)
$dom-> Save ("Newfile.xml");

echo "$titles = $dom-> getElementsByTagName ("title");
foreach ($titles as $node) {
echo $node-> textcontent. "<br/>";
That's OK.
Echo $node->firstchild->data. "<br/>";
}

/*
echo "foreach ($dom->documentelement->childnodes as $items) {
If the node is an element (NodeType = 1) and the name is item, continue the loop
if ($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";
}
}
}
}
*/

Querying data Using XPath
echo "$xpath = new Domxpath ($dom);
$titles = $xpath->query ("/rss/channel/item/title");
foreach ($titles as $node) {
echo $node->textcontent. " <br/> ";
}
/*
This is similar to using the getElementsByTagName () method, but XPath is much more powerful
A bit deeper may be the case:
/rss/channel/item[position () = 1]/title Returns all of the first item element
/rss/channel/item/title[@id = ' 23 '] returns all title with an id attribute and a value of 23
/rss/channel/&folder&/title returns the title of all articles elements (the translator:&folder& represents the directory depth)
*/

Writing 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);

Removing nodes from the DOM
$dom->documentelement->removechild ($dom->documentelement->getelementsbytagname ("channel")-> Item (0));
Or use XPath to query out the node and delete it
$dom->documentelement->removechild ($xpath->query ("/rss/channel")->item (0));
$dom->save ("Newfile.xml");

Modifying node data from the DOM
Modify the first title file
This place is rather stupid, create a new node and replace the old one. If any friend has any other good ways, please tell me.
$firstTitle = $xpath->query ("/rss/channel/item/title")->item (0);
$newTitle = $dom->createelement ("title");
$newTitle->appendchild ("This's the new title text!!!")) (new Domtext);
$firstTitle->parentnode->replacechild ($newTitle, $firstTitle);
modifying properties
$firstTitle = $xpath->query ("/rss/channel/item/title")->item (0);
$firstTitle->setattribute ("by", "4");
$dom->save ("Newfile.xml");

echo "

//The following code obtains and parses the first page of the 111cn.net and returns the contents of the title element.
/*
$dom->loadhtmlfile ("http://www.111cn.net/");
$title = $dom->getelementsbytagname ("title");
Print $title->item (0)->textcontent;
*/