Using session variables in Facebook application

I build a simple application available at: http://www.facebook.com/apps/application.php?id=216798445011521

About The Application: the application allow you to create in your fan page a "before & after" user like the page and show him a html content.

I have a little question: I want to upgrade it to a little more tricky but the problem is when you click at index.php on link that redirect the user to about.php my script lose the variable example: if the user is admin or not, if he fan or not, page id etc'

there is an option to fix it开发者_如何学Go? maybe the canvas url force him to support at multi application page or something?

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Loosing variable? Probably you should store that kind of data in session, on the server side.

If you do that app in PHP take a look here http://php.net/manual/pl/features.sessions.php

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Store all the necessary variables in $_SESSION, so that you can simply access them through out the session.