php中session
session_unset()
释放当前在内存中已经创建的所有$_SESSION变量，但不删除session文件以及不释放对应的session
id
session_destroy()
删除当前用户对应的session文件以及释放session
id，内存中的$_SESSION变量内容依然保留
因此，释放用户的session所有资源，需要顺序执行如下代码：
复制代码 代码如下:
$_SESSION['user'] = 'lowell';
session_unset();
session_destroy();
?>
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