<?php
session_start();
$_SESSION['username']="zhuzhao";
?>
<?php
session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username已经存在";
else
echo "username不存在";
?>
<?php
session_start();
$_SESSION['username']="zhuzhao";
?>
<?php
session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username已经存在";
else
echo "username不存在";
?>
暂无评论，快来抢沙发吧~