对于http:///www.yourdomain.com/yourscript.php?count=56给注册变量$count指定一个新值,这一点对于安全很重要:只能在服务器端的脚本中删除一个没有注册的对话变量。
如果要完全删除一个对话变量,首先需要从系统中注销它:
session_unregister('count');
要完全删除一个对话变量的脚本是非常简单,如下所示:
session_destroy();
使用PHP对话变量可以减少访问数据库的频率,使代码更加清晰,而且可以减少对用户发送的cookie的数量,它是最简单的方法了。

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