标签：
登录页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <form action="dlchuli.php" method="post"> <h1>开发部内容留言板</h1> <div>用户名:<input type="text" name="yhm" /></div><br /> <div>口 令：<input type="text" name="kl" /></div><br /> <div><input type="submit" value="登录" /> </div> </form> </body> </html>
登录处理页面
<?php
session_start();
$yhm=$_POST["yhm"];
$mm=$_POST["kl"];
include("../DBDA.php");
$db=new DBDA();
$sql="select count(*) from yuangong where UserName=‘{$yhm}‘ and PassWord=‘{$mm}‘";
$j=$db->StrQuery($sql);
var_dump($j);
if($j==1)
{
$_SESSION["yhm"]=$yhm;
header("location:zhu.php");
}
else
{
echo"登录失败";
}
主页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<h1><a href="fabu.php">发布消息</a> <a href="tuichu.php">退出系统</a></h1>
<h3>留言信息：</h3>
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>发送人</td>
<td>发送时间</td>
<td>接收人</td>
<td>信息内容</td>
</tr>
<?php
session_start();
if(empty ($_SESSION["yhm"]))//判断用户名是否存在
{
header("location:Untitled-1.php");
exit;// 跳出程序
}
$yhm=$_SESSION["yhm"];
include("../DBDA.php");
$db=new DBDA();
$sql="select * from liuyan where Recever=‘{$yhm}‘ or Recever=‘suoyou‘";
$jieguo=$db->Query($sql);
foreach($jieguo as $v)
{
//根据循环$v[1]（发送者的用户名【昵称】）在yuangong表查询发送者的名字
$sqlf="select Name from yuangong where UserName=‘{$v[1]}‘";
$fszxm=$db->StrQuery($sqlf);
//根据登录者的用户名在yuangong表里查询他（接收者）的姓名
$jieshou="";
if($v[2]=="suoyou")
{
$jieshou="所有人";
}
else
{
$sqlj="select Name from yuangong where UserName=‘{$yhm}‘";
$jieshou=$db->StrQuery($sqlj);
}
echo"<tr>
<td>{$fszxm}</td>
<td>{$v[3]}</td>
<td>{$jieshou}</td>
<td>{$v[4]}</td>
</tr>";
}
?>
</table>
</body>
</html>
消息发布页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<?php
session_start();
if(empty($_SESSION["yhm"]))
{
header("location:Untitled-1.php");
exit;
}
$yhm=$_SESSION["yhm"];
include("../DBDA.php");
$db=new DBDA();
?>
<h1><a href="zhu.php">查看消息</a> <a href="tuichu.php">退出系统</a></h1>
<h3>发送消息：</h3>
<form action="fschuli.php" method="post">
<div>接收人：
<select name="jsr">
<option value="suoyou">所有人</option>
<?php
$sql1="select Firend from firend where Me=‘{$yhm}‘";
$py=$db->Query($sql1);
foreach($py as $v)
{
$sql2="select Name from yuangong where UserName=‘{$v[0]}‘";
$jsr=$db->StrQuery($sql2);
echo"<option value=‘{$v[0]}‘>{$jsr}</option>";
}
?>
</select>
</div>
<br />
<div>信息内容：
<textarea name="xxnr">
</textarea>
</div>
<input type="submit" value="发送" />
<input type="reset" value="复位" />
</form>
</body>
</html>
发布消息处理页面
<?php
session_start();
$xxnr=$_POST["xxnr"];
$jsr=$_POST["jsr"];
$fsr = $_SESSION["yhm"];
$time = date("Y-m-d H:i:s");
include("../DBDA.php");
$db=new DBDA();
$sql="insert into liuyan values(‘‘,‘{$fsr}‘,‘{$jsr}‘,‘{$time}‘,‘{$xxnr}‘,‘未读‘)";
if($db->Query($sql,0))
{
header("location:fabu.php");
}
退出系统页面
退出系统页面是退回登录页面
<?php
session_start();
unset($_SESSION["uid"]);
header("location:Untitled-1.php");
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原文地址：http://www.cnblogs.com/wcc731546227/p/5532747.html
