前面介紹了動態添加XML資料的方法，這裡在原有Message_XML類的基礎上稍作改進，實現動態刪除xml的功能：
一. 代碼
<?php class Message_XML extends DomDocument{//定義類Message_XML並繼承DomDocument類 private $Root; public function construct(){//建構函式 parent:: construct(); if(!file_exists("message.xml")){//判斷檔案是否存在 $xmlstr="<?xml version='1.0' encoding='GB2312'?><message></message>"; $this->loadXML($xmlstr); $this->save("message.xml");//產生XML文檔 }else{ $this->load("message.xml");//如果存在則載入XML文檔 } } public function add_message($user,$address){//建立方法 $Root=$this->documentElement;//定義根節點 $admin_id=date("Ynjhis"); $Node_admin_id=$this->createElement("admin_id");//建立節點admin_id $text=$this->createTextNode(iconv("GB2312","UTF-8",$admin_id));//建立一個文本節點 $Node_admin_id->appendChild($text);//將文本節點添加到admin_id節點中 $Node_user=$this->createElement("user");//建立節點user $text=$this->createTextNode(iconv("GB2312","UTF-8",$user));//建立一個文本節點 $Node_user->appendChild($text);//將文本節點添加到user節點中 $Node_address=$this->createElement("address");//建立節點address $text=$this->createTextNode(iconv("GB2312","UTF-8",$address));//建立一個文本節點 $Node_address->appendChild($text);//將文本節點添加到address節點中 $Node_Record=$this->createElement("record");//建立節點record $Node_Record->appendChild($Node_admin_id);//將admin_id節點添加到record節點中 $Node_Record->appendChild($Node_user);//將user節點添加到record節點中 $Node_Record->appendChild($Node_address);//將address節點添加到record節點中 $Root->appendChild($Node_Record);//將record節點添加到根節點中 $this->save("message.xml");//產生XML文檔 echo "<script>alert('添加成功');location.href='".$_SERVER['PHP_SELF']."'</script>"; } public function delete_message($admin_id){//定義刪除函數 $Root=$this->documentElement;//定義根節點 $xpath=new DOMXPath($this);//定義DOMXPath $Node_Record=$xpath->query("//record[admin_id='$admin_id']");//執行查詢語句 $Root->removeChild($Node_Record->item(0));//刪除節點 $this->save("message.xml");//產生XML文檔 echo "<script>alert('刪除成功');location.href='".$_SERVER['PHP_SELF']."'</script>"; } public function show_message(){//定義輸出XML檔案中的內容函數 $Root=$this->documentElement;//定義根節點 $xpath=new DOMXPath($this);//定義DOMXPath $Node_Record=$this->getElementsByTagName("record");//擷取節點record的標籤 $Node_Record_length=$Node_Record->length;//擷取標籤的數量 print"<table width='506' bgcolor='#FFFFCC'><tr>"; print"<td width='106' height='22' align='center'>"; print"<b>使用者名稱</b>"; print"</td><td width='300' align='center'>"; print"<b>留言資訊</b></td></tr>"; for($i=0;$i<$Node_Record->length;$i++){//應用for迴圈輸出查詢結果 $k=0; foreach($Node_Record->item($i)->childNodes as $articles){ //通過foreach語句讀取返回對象中的資料 $field[$k]=iconv("UTF-8","GB2312",$articles->textContent);//實現編碼格式的轉換 $k++; } print"<table width='506' bgcolor='#FFFFCC'><tr>"; print"<td width='106' height='22' align='center'>"; print"$field[1]"; print"</td><td width='300' align='center'>"; print"$field[2]"; print"</td><td width='100' align='center'>"; print"<a href='?Action=delete_message&admin_id=$field[0]'>刪除</a></td>"; print"</tr></table>"; } } public function post_message(){ print"<table width='506' bgcolor='#FFFFCC'><form method='post' action='?Action=add_message'>"; print"<tr><td width='106' height='22'> 使用者名稱：</td><td><input type='text' name='user' size=50></td></tr>"; print"<tr><td width='106' height='22'> 留言資訊：</td><td width='400'><textarea name='address' cols='48' rows='5' id='address'></textarea></td></tr>"; print"<tr><td width='106' height='30'> <input type='submit' value='添加資料'></td><td align='right'><a href='?Action=show_message'>查看資料</a> </td></tr></form></table>"; } }?><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>刪除XML資料</title><style type="text/css"><!--body,td,th { font-size: 12px;}--></style></head><body><table width="506" height="50" border="0" cellpadding="0" cellspacing="0" bgcolor="#33BE6B"> <tr> <td width="506" height="50" valign="bottom" background="title.gif"> <table width="506"> <tr> <td height="24" align="right" scope="col"> <a href="?Action=post_message" rel="external nofollow" >添加資料</a> </td></tr></table></td></tr> <?php $HawkXML=new Message_XML;//執行個體化Message_XML類 $Action="";//初始化為空白值 if(isset($_GET['Action'])) $Action=$_GET['Action']; switch($Action){ case "show_message": $HawkXML->show_message();//當參數值為show_message時執行show_message()函數 break; case "post_message": $HawkXML->post_message();//當參數值為post_message時執行post_message()函數 break; case "add_message": $HawkXML->add_message($_POST['user'],$_POST['address']);//當參數值為add_message時執行add_message()函數 break; case "delete_message": $HawkXML->delete_message($_GET['admin_id']);//當參數值為delete_message時執行delete_message()函數 break; } ?></table></body></html>
二. 運行結果
相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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