login页面

<form action="loginchuli.php" method="post">

    <div>用户名：<input type="text" name="uid" /></div>

    <div>密码：<input type="text" name="pwd" /></div>

    <input type="submit" value="登录" />

</form>

loginchuli页面

<?php

session_start();

$uid = $_POST["uid"];

$pwd = $_POST["pwd"];

include("../DBDA.php");

$db = new DBDA();

$sql = "select count(*) from yuangong where username='{$uid}' and password = '{$pwd}'";

$z = $db->StrQuery($sql);

if($z == 1)

{

    $_SESSION["uid"] = $uid;

    header("location:main.php");

}

else

{

    header("location:login.php");

}

<?php

session_start();

if(empty($_SESSION["uid"]))

{

    header("location:login.php");

    exit;

}

$uid = $_SESSION["uid"];

include("../DBDA.php");

$db = new DBDA();

?>

<br /><br />

<a href="main.php">查看信息</a> <a href="tuichu.php">退出系统</a>

<br />

<h2>信息发送</h2>

<form action="fabuchuli.php" method="post">

<div>接收人：

    <select name="jieshou">

        <option value="suoyou">所有人</option>

        <?php

            $sql = "select firend from firend where me='{$uid}'";

            $attr = $db->Query($sql);

            foreach($attr as $v)

            {

                $sqln = "select Name from yuangong where username='{$v[0]}'";

                $name = $db->StrQuery($sqln);

                echo "<option value='{$v[0]}'>{$name}</option>";

            }

        ?>

    </select>

</div>

<br />

<div>

    信息内容：

    <textarea name="neirong">

    </textarea>

</div>

<br />

<div>

    <input type="submit" value="发送" />

    <input type="reset" value="复位" />

</div>

</form>

<?php

session_start();

include("../DBDA.php");

$db = new DBDA();

$jieshou = $_POST["jieshou"];

$neirong = $_POST["neirong"];

$uid = $_SESSION["uid"];

$time = date("Y-m-d H:i:s");

$sql = "insert into liuyan values('','{$uid}','{$jieshou}','{$time}','{$neirong}',false)";

if($db->Query($sql,0))

{

    header("location:fabu.php");

}

else

{

    echo "发布失败！";

}

<a href="fabu.php">发布信息</a> <a href="tuichu.php">退出系统</a>

<br />

<br />

<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["uid"]))

{

    header("location:login.php");

    exit;

}

$uid = $_SESSION["uid"];

include("../DBDA.php");

$db = new DBDA();

$sql = "select * from liuyan where recever='{$uid}' or recever='suoyou'";

$attr = $db->Query($sql);

foreach($attr as $v)

{

    //处理发送者姓名

    $sqlname = "select Name from yuangong where username='{$v[1]}'";

    $name = $db->StrQuery($sqlname);

    //处理接收者姓名

    $jieshou = "";

    if($v[2]=="suoyou")

    {

        $jieshou = "所有人";

    }

    else

    {

        $sqln = "select Name from yuangong where username='{$uid}'";

        $jieshou = $db->StrQuery($sqln);

    }

    echo "<tr>

    <td>{$name}</td>

    <td>{$v[3]}</td>

    <td>{$jieshou}</td>

    <td>{$v[4]}</td>

    </tr>";

}

?>

</table>

<?php

session_start();

unset($_SESSION["uid"]);

header("location:login.php");