下面的例子簡單的示範了DOM對XML的操作,詳細解釋請看代碼中的注釋
<? /************************************************ ** use XML in PHP5 ** reference site: ** http://cn.php.net/manual/zh/ref.dom.php ** the follow codes need PHP5 support *************************************************/ //首先要建立一個DOMDocument對象 $dom = new DomDocument(); //然後載入XML檔案 $dom -> load("test.xml"); //輸出XML檔案 //header("Content-type: text/xml;charset=gb2312"); //echo $dom -> saveXML(); //儲存XML檔案,傳回值為int(檔案大小,以位元組為單位) //$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 $node->firstChild->data . "<br/>"; } /* echo "<hr/>從根結點遍曆所有結點:<br/>"; foreach ($dom->documentElement->childNodes as $items) { //如果節點是一個元素(nodeType == 1)並且名字是item就繼續迴圈 if ($items->nodeType == 1 && $items->nodeName == "item") { foreach ($items->childNodes as $titles) { //如果節點是一個元素,並且名字是title就列印它. if ($titles->nodeType == 1 && $titles->nodeName == "title") { print $titles->textContent . "\n"; } } } } */ //使用XPath查詢資料 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 返回第一個item元素的所有 /rss/channel/item/title[@id = '23'] 返回所有含有id屬性並且值為23的title /rss/channel/&folder&/title 返回所有articles元素下面的title(譯者註:&folder&代表目錄深度) */ //向DOM中寫入新資料 $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中刪除節點 //$dom->documentElement->RemoveChild($dom->documentElement->getElementsByTagName("channel")->item(0)); //或者使用xpath查詢出節點再刪除 //$dom->documentElement->RemoveChild($xpath->query("/rss/channel")->item(0)); //$dom->save("newfile.xml"); //從DOM中修改節點資料 //修改第一個title的檔案 //這個地方比較笨,新建立一個節點,然後替換舊的節點。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>"; //下面的代碼獲得並解析php.net的首頁,將返第一個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檔案代碼:
<?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>
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