PHP学习笔记（<a href='?out=login'>）

<?php
/*
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* Programmer : Msn/QQ haowubai@hotmail.com (925939)
* www.php100.com Develop a project PHP - MySQL - Apache
* Window 2003 - Preferences - PHPeclipse - PHP - Code Templates
*/
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($pw=='e1bfd762321e409cee4ac0b6e841963c'){
setcookie("cookie", "ok");
echo "<script language=\"javascript\">location.href='login.php';</script>";
}
}
include("head.php");
if($_COOKIE['cookie']!='ok'){
?>

<SCRIPT language=javascript>
function Checklogin()
{
if (myform.id.value=="")
{
alert("请填写登录名");
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>

//<a href='?out=login'>就是给当前页面提交一个参数， 参数名为'out' ，参数值为login

<?
}
?>