<?
class Message_XML extends DomDocument{//Message_XML类，继承PHP5的DomDocument类
private $Root;//属性
//方法
public function __construct(){//构造函数
parent:: __construct();
if (!file_exists("message.xml")){//创建或读取存储留言信息的XML文档message.xml
$xmlstr = "<?xml version='1.0' encoding='UTF-8'?><message></message>";
$this->loadXML($xmlstr);
$this->save("message.xml");
}
else
$this->load("message.xml");
}
//增加留言
public function add_message($Subject,$Content,$Poster){//标题，内容, 发布人
$Root = $this->documentElement;
//获取留言消息
$AutoID =date("Ynjhis");//年月日时分秒
$Node_AutoID= $this->createElement("autoid");
$text= $this->createTextNode($AutoID);
$Node_AutoID->appendChild($text);
$Node_Subject = $this->createElement("subject");
$text = $this->createTextNode($Subject);
$Node_Subject->appendChild($text);
$Node_Content = $this->createElement("content");
$text= $this->createTextNode($Content);
$Node_Content->appendChild($text);
$Node_Poster = $this->createElement("poster");
$text = $this->createTextNode($Poster);
$Node_Poster->appendChild($text);
//建立一条留言记录
$Node_Record = $this->createElement("record");
$Node_Record->appendChild($Node_AutoID);
$Node_Record->appendChild($Node_Subject);
$Node_Record->appendChild($Node_Content);
$Node_Record->appendChild($Node_Poster);
//加入到根结点下
$Root->appendChild($Node_Record);
$this->save("message.xml");
echo "<script>alert('添加成功');location.href='".$_SERVER['PHP_SELF']."'</script>";
}
//删除留言
public function delete_message($AutoID){//根据ID删除
$Root = $this->documentElement;
//查询用户选择删除的留言记录
$xpath = new DOMXPath($this);
$Node_Record= $xpath->query("//record[autoid=$AutoID]");
$Root->removeChild($Node_Record->item(0));
$this->save("message.xml");
echo "<script>alert('删除成功');location.href='".$_SERVER['PHP_SELF']."'</script>";
}
//显示留言
public function show_message(){
$Root = $this->documentElement;
$xpath = new DOMXPath($this);
//查询所有的留言记录
$Node_Record = $this->getElementsByTagName("record");
$Node_Record_Length =$Node_Record->length;
//循环输出其留言标题和内容信息
for($i=0;$i<$Node_Record->length;$i++){
$K=0;
foreach ($Node_Record->item($i)->childNodes as $articles){
$Field[$K]=$articles->textContent;
$K++;
}
print "<li>";
print "<b>留言标题：</b>$Field[1] <b>发布人：</b>$Field[3]<br><b>留言内容：</b><br>$Field[2]
<div align=right><a href='?Action=update_message&AutoID=$Field[0]'>编辑</a>
<a href='?Action=delete_message&AutoID=$Field[0]'>删除</a></div>/n";
print "</li>";
}
}
//修改留言
public function update_message($AutoID){//根据ID修改
$Root = $this->documentElement;
$xpath = new DOMXPath($this);
$Node_Record = $xpath->query("//record[autoid=$AutoID]");
$K=0;
foreach ($Node_Record->item(0)->childNodes as $articles){
$Field[$K]=$articles->textContent;//元素的内容
$K++;
}
print "<form method='post' action='?Action=save_message&AutoID=$AutoID'>";
print "<li>留言标题：<input type=text name='Subject' value='$Field[1]' size=20></li>";
print "<li>留言内容：<textarea name='Content' cols=50 rows=5>$Field[2]</textarea></li>";
print "<li>发布人：<input type=text name='Poster' value='$Field[3]' size=20></li>";
print "<li><input type='submit' value='修改留言'></li></form>";
}
//保存留言
public function save_message($AutoID,$Subject,$Content,$Poster){//ID,标题，内容, 发布人
$Root = $this->documentElement;
//查询待修改的记录
$xpath = new DOMXPath($this);
$Node_Record = $xpath->query("//record[autoid=$AutoID]");
$Replace[0]=$AutoID;
$Replace[1]=$Subject;
$Replace[2]=$Content;
$Replace[3]=$Poster;
$K=0;
//修改
foreach ($Node_Record->item(0)->childNodes as $articles){
$Node_newText = $this->createTextNode($Replace[$K]);
$articles->replaceChild($Node_newText,$articles->lastChild);//***************有点疑问
$K++;
}
echo "<script>alert('修改成功');location.href='".$_SERVER['PHP_SELF']."'</script>";
$this->save("message.xml");
}
//上传留言信息
public function post_message(){
print "<form method='post' action='?Action=add_message'>";
print "<li>留言标题：<input type=text name='Subject' size=20></li>";
print "<li>留言内容：<textarea name='Content' cols=50 rows=5></textarea></li>";
print "<li>发布人：<input type=text name='Poster' size=20></li>";
print "<li><input type='submit' value='添加留言'></li></form>";
}
}//class end
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP+XML留言板</title>
<style type="text/css">
#box{width:980px;magin:0 auto}
#box ul{list-style:none;padding:0;margin:0;margin-bottom:20px}
#box ul li{list-style:none;padding:0;margin:0;margin-bottom:5px}
</style>
</head>
<body>
<div id="box">
<h3><strong>PHP+XML留言板</strong></h3>
<ul><a href=?Action=post_message>发表留言</a> <a href=?Action=show_message>显示留言</a></ul>
<ul>
<?php
//使用Message_XML类完成留言板
$HawkXML = new Message_XML;//创建一个实例
$Action ="";
if(isset($_GET['Action']))
$Action = $_GET['Action'];
switch($Action){
case "show_message": //查看
$HawkXML->show_message();
break;
case "post_message"://提交
$HawkXML->post_message();
break;
case "add_message"://增加
$HawkXML->add_message($_POST['Subject'],$_POST['Content'],$_POST['Poster']);
break;
case "delete_message"://删除
$HawkXML->delete_message($_GET["AutoID"]);
break;
case "update_message"://修改
$HawkXML->update_message($_GET["AutoID"]);
break;
case "save_message"://保存
$HawkXML->save_message($_GET["AutoID"],$_POST['Subject'],$_POST['Content'],$_POST['Poster']);
break;
default://默认查看
$HawkXML->show_message();
break;
}
?>
</ul>
</div>
</body>
</html>
