用php人工使网页过期

作者: Joe Clark
翻译: detrox

After going through a series of pages during a registration process, you don't want the user to be able to go back after the final submit. What can you do to manually "expire" those pages, and perhaps display a custom message?

在填写完成某注册过程中的一系列网页后，你不想用户能够在最终提交后回到以前的页面。你应该怎样做才能人工地使这些网页过期，并且如果有可能则给出一条已定制好的消息呢。

In this scenario, I didn't want my session to expire as I needed it to continue. Instead, I used an extra session variable to track whether my session was alive or not. There are three main components: (1) the entry script, (2) the Cache-control directive, (3) the conditional check, and (4) manually expiring a portion of the session.

在这一关里，我不想让我的session过期，因为我需要它能够继续运转。我使用一个额外的session变量来跟踪我的session是否为活动的。有三个主要的组件: (1) 入口脚本 (2) 缓存控制指示符 (3)条件检测 和 (4) 人工使一部分session过期。

THE ENTRY SCRIPT
入口脚本
I use an entry script to start my session. This accomplishes two things: (1) destroys any session already in progress, and (2) starts a new session.

我使用一个入口脚本来开始我的session. 它用来完成两件事: (1) 销毁任何已经存在于过程中的session，和(2) 开始一个新的session.

entry.php:

<?
php   session_start();   session_unset();   session_destroy();   session_start();   session_register('alive');