复制代码 代码如下:
<?php
session_start();
$_SESSION['username']="zhuzhao";
?>
session_start();
$_SESSION['username']="zhuzhao";
?>
复制代码 代码如下:
<?php
session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username已经存在";
else
echo "username不存在";
?>
session_start();
unset($_SESSION['username']);
if(isset($_SESSION['username']))
echo "username已经存在";
else
echo "username不存在";
?>