本文實例講述了PHP實現動態刪除XML數據的方法。分享給大家供大家參考，具體如下：
前面介紹了動態添加XML數據的方法，這里在原有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并繼承DomDocument類
private $Root;
public function __construct(){//構造函數
parent:: __construct();
if(!file_exists("message.xml")){//判斷文件是否存在
$xmlstr="<?xml version='1.0' encoding='GB2312'?><message></message>";
$this->loadXML($xmlstr);
$this->save("message.xml");//生成XML文檔
}else{
$this->load("message.xml");//如果存在則載入XML文檔
}
}
public function add_message($user,$address){//創建方法
$Root=$this->documentElement;//定義根節點
$admin_id=date("Ynjhis");
$Node_admin_id=$this->createElement("admin_id");//創建節點admin_id
$text=$this->createTextNode(iconv("GB2312","UTF-8",$admin_id));//創建一個文本節點
$Node_admin_id->appendChild($text);//將文本節點添加到admin_id節點中
$Node_user=$this->createElement("user");//創建節點user
$text=$this->createTextNode(iconv("GB2312","UTF-8",$user));//創建一個文本節點
$Node_user->appendChild($text);//將文本節點添加到user節點中
$Node_address=$this->createElement("address");//創建節點address
$text=$this->createTextNode(iconv("GB2312","UTF-8",$address));//創建一個文本節點
$Node_address->appendChild($text);//將文本節點添加到address節點中
$Node_Record=$this->createElement("record");//創建節點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
$this->save("message.xml");//生成XML文檔
echo "<script>alert('添加成功');location.href='".$_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
$this->save("message.xml");//生成XML文檔
echo "<script>alert('刪除成功');location.href='".$_SERVER['PHP_SELF']."'</script>";
}
public function show_message(){//定義輸出XML文件中的內容函數
$Root=$this->documentElement;//定義根節點
$xpath=new DOMXPath($this);//定義DOMXPath
$Node_Record=$this->getElementsByTagName("record");//獲取節點record的標簽
$Node_Record_length=$Node_Record->length;//獲取標簽的數量
print"<table width='506' bgcolor='#FFFFCC'><tr>";
print"<td width='106' height='22' align='center'>";
print"<b>用戶名</b>";
print"</td><td width='300' align='center'>";
print"<b>留言信息</b></td></tr>";
for($i=0;$i<$Node_Record->length;$i++){//應用for循環輸出查詢結果
$k=0;
foreach($Node_Record->item($i)->childNodes as $articles){ //通過foreach語句讀取返回對象中的數據
$field[$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'> 用戶名：</td><td><input type='text' name='user' size=50></td></tr>";
print"<tr><td width='106' height='22'> 留言信息：</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='添加數據'></td><td align='right'><a href='?Action=show_message'>查看數據</a> </td></tr></form></table>";
}
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>刪除XML數據</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" >添加數據</a> </td></tr></table></td></tr>
<?php
$HawkXML=new Message_XML;//實例化Message_XML類
$Action="";//初始化為空值
if(isset($_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
希望本文所述對大家PHP程序設計有所幫助。
