一个简单的PHP登录演示(SESSION版 与 COOKIE版)

//==============COOKIE版本的简单登录================
if ($_GET[out]){
setcookie('id','');
setcookie('pw','');
echo "<script>location.href='index.php'</script>";
}

if ($_POST[name]&&$_POST[password]){
setcookie('id',$_POST[name],time()+3600);
setcookie('pw',$_POST[password],time()+3600);

echo "<script>location.href='index.php'</script>";
}

if ($_COOKIE[id]&&$_COOKIE[pw]){
echo "登录成功<br>用户名：".$_COOKIE[id]."<br>密码：".$_COOKIE[pw];

echo "<a href='index.php?out=out'>退出</a>";
}

?>

<form action="" method="post">
用户ID：<input type="text" name="name"><br><br>
密码：<input type="password" name="password"><br><br>

<input type="submit" value="登录">

</form>

//=========== SESSION 版本的简单登录=================

session_start(); //必须放在最上面，否则会出错

if ($_GET[out]){

unset($_SESSION[id]);
unset($_SESSION[pw]);
}

if ($_POST[name]&&$_POST[password]){

$_SESSION[id]=$_POST[name];
$_SESSION[pw]=$_POST[password];

}

if ($_SESSION[id]&&$_SESSION[pw]){
echo "登录成功<br>用户名：".$_SESSION[id]."<br>密码：".$_SESSION[pw];

echo "<a href='index.php?out=out'>退出</a>";
}

?>

<form action="" method="post">
用户ID：<input type="text" name="name"><br><br>
密码：<input type="password" name="password"><br><br>

<input type="submit" value="登录">

</form>