[PHP]session判断登录状况

[PHP]session判断登录状况

.session_start();   
.isset(   
.SESSION['username'])?include("checklogin.php"):session_destroy(); 
.?>   
.欢迎页面，说明已经登录进来   
.<?php   
.if (isset(GET['out'])){   
.GET['out']=='index'?session_destroy():'';   
.}   
.?>   
.<a href='?out=index'>退出</a>   
.checklogin.php页面是<?php   
.//session_start(); 

if (empty(SESSION['username'])){   
echo 'CuPlayer.comjs提示'; session_destroy();