PHP5中增強了XML的支持,使用DOM擴充了XML操作的能耐。這些函數作為PHP5 核心的一部分,無需安裝即可使用。
下面的範例簡單的示範了DOM對XML的操作,詳細解釋請看程式碼中的註解
<?
/************************************************
** use XML in PHP5
** reference site:
** http://cn.php.net/manual/zh/ref.dom.php
** the follow codes need PHP5 support
** www.knowsky.com
*************************************************/
//首先要建立一個DOMDocument對象
$dom = new DomDocument();
//然後載入XML文件
$dom -> load("test.xml");
//輸出XML文件
//header("Content-type: text/xml;charset=gb2312");
//echo $dom -> saveXML();
//儲存XML文件,傳回值為int(文件大小,以位元組為單位)
//$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/>";
//這樣也可以
//echo $node->firstChild->data . "<br/>";
}
/*
echo "<hr/>從根結點遍歷所有結點:<br/>";
foreach ($dom->documentElement->childNodes as $items) {
//如果節點是一個元素(nodeType == 1)且名字是item就繼續循環
if ($items->nodeType == 1 && $items->nodeName == "item") {
foreach ($items->childNodes as $titles) {
//如果節點是元素,且名字是title就印出它.
if ($titles->nodeType == 1 && $titles->nodeName == "title") {
print $titles->textContent . "n";
}
}
}
}
*/
//使用XPath查詢數據
echo "<hr/>使用XPath查詢的title節點結果:<hr/>";
$xpath = new domxpath($dom);
$titles = $xpath->query("/rss/channel/item/title");
foreach ($titles as $node)
{
echo $node->textContent."<br/>";
}
/*
這樣和使用getElementsByTagName()方法差不多,但是Xpath要強大的多深入一點可能是這樣:
/rss/channel/item[position() = 1]/title 傳回第一個item元素的所有
/rss/channel/item/title[@id = '23'] 傳回所有含有id屬性且值為23的title
/rss/channel/&folder&/title 回傳所有articles元素下面的title(譯者註:&folder&代表目錄深度)
*/
//向DOM寫入新數據
$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);
//從DOM移除節點
//$dom->documentElement->RemoveChild($dom->documentElement->getElementsByTagName("channel")->item(0));
//或是使用xpath查詢出節點再刪除
//$dom->documentElement->RemoveChild($xpath->query("/rss/channel")->item(0));
//$dom->save("newfile.xml");
//從DOM修改節點數據
//修改第一個title的文件
//這個地方比較笨,新建立一個節點,然後取代舊的節點。如果哪位朋友有其他好的方法請一定要告訴我
$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, $firstTitle);
//修改屬性
//$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>";
//下面的程式碼取得並解析php .net的首頁,將回饋第一個title元素的內容。
/*
$dom->loadHTMLFile(" http://www.php.net/ ");
$title = $dom->getElementsByTagName("title");
print $title->item(0)->textContent;
*/
?>
下面是test.xml檔碼:
<?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>