PHP實現動態(tài)添加XML中數據的方法

?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(chuàng)建方法
    $Root=$this->documentElement;//定義根節(jié)點
    $admin_id=date("Ynjhis");
    $Node_admin_id=$this->createElement("admin_id");//創(chuàng)建節(jié)點admin_id
    $text=$this->createTextNode(iconv("GB2312","UTF-8",$admin_id));//創(chuàng)建一個文本節(jié)點
    $Node_admin_id->appendChild($text);//將文本節(jié)點添加到admin_id節(jié)點中
    $Node_user=$this->createElement("user");//創(chuàng)建節(jié)點user
    $text=$this->createTextNode(iconv("GB2312","UTF-8",$user));//創(chuàng)建一個文本節(jié)點
    $Node_user->appendChild($text);//將文本節(jié)點添加到user節(jié)點中
    $Node_address=$this->createElement("address");//創(chuàng)建節(jié)點address
    $text=$this->createTextNode(iconv("GB2312","UTF-8",$address));//創(chuàng)建一個文本節(jié)點
    $Node_address->appendChild($text);//將文本節(jié)點添加到address節(jié)點中
    $Node_Record=$this->createElement("record");//創(chuàng)建節(jié)點record
    $Node_Record->appendChild($Node_admin_id);//將admin_id節(jié)點添加到record節(jié)點中
    $Node_Record->appendChild($Node_user);//將user節(jié)點添加到record節(jié)點中
    $Node_Record->appendChild($Node_address);//將address節(jié)點添加到record節(jié)點中
    $Root->appendChild($Node_Record);//將record節(jié)點添加到根節(jié)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 show_message(){//定義輸出XML文件中的內容函數
    $Root=$this->documentElement;//定義根節(jié)點
    $xpath=new DOMXPath($this);//定義DOMXPath
    $Node_Record=$this->getElementsByTagName("record");//獲取節(jié)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='400' align='center'>";
    print"b>留言信息/b>/td>/tr>";
    for($i=0;$i$Node_Record->length;$i++){//應用for循環(huán)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='400' align='center'>";
     print"$field[2]";
     print"/td>/tr>/table>";
    }
   }
   public function post_message(){//定義輸出表單的函數
    print"table width='506' bgcolor='#FFFFCC'>form method='post' action='?Action=add_message'>";
    print"tr>td width='106' height='22'>nbsp;nbsp;nbsp;nbsp;用戶名：/td>td>input type='text' name='user' size=50>/td>/tr>";
    print"tr>td width='106' height='22'>nbsp;nbsp;nbsp;nbsp;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'>nbsp;nbsp;input type='submit' value='添加數據'>/td>td align='right'>a href='?Action=show_message'>查看數據/a>nbsp;nbsp;nbsp;nbsp;/td>/tr>/form>/table>";
   }
  }
?>
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
title>添加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">nbsp;nbsp;a href="?Action=post_message" rel="external nofollow" >添加數據/a>nbsp;nbsp;nbsp;/td>/tr>/table>/td>/tr>/table>
     ?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(zhí)行show_message()函數
       break;
       case "post_message":
       $HawkXML->post_message();//當參數值為post_message時執(zhí)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(zhí)行add_message()函數
       break;
      }
     ?>
/body>
/html>