简单PHP留言板之六 —— 登陆退出

文件名：login.php

<?php

include("conn.php");

  if($_GET[out]){
      setcookie("cookie", "out");
    echo "<script language=\"javascript\">location.href='login.php';</script>";
  }


  if($_POST[id]=='admin'){
    $pw=md5($_POST[pw]);
    if($pw=='21232f297a57a5a743894a0e4a801fc3'){
     setcookie("cookie", "ok");
       echo "<script language=\"javascript\">location.href='login.php';</script>";
    }
  }
include("head.php");
if($_COOKIE['cookie']!='ok'){
?>

<SCRIPT language=javascript>
function Checklogin()
{
    if (myform.id.value=="")
    {
        alert("请填写登陆名");
        myform.id.focus();
        return false;
    }
        if (myform.pw.value=="")
    {
        alert("密码不能为空");
        myform.pw.focus();
        return false;
    }
}
</SCRIPT>

<form action="" method="post" name="myform" onsubmit="return Checklogin();">
  ID <input type="text" name="id" /><br>
  PW <input type="password" name="pw" /> <input type="submit" name="submit" value="登陆"/>
  </form>
<?
}else{
?>
    <a href='?out=login'>退出</a>
<?
}
?>

用户名密码都是admin

这个登陆仅是验证，没有添加到数据库中