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Facebook now offer subscriptions to users so you can get realtime updates on changes. If my app receives an update, I plan to store it in the database. I would also like to detect if their session exists. If it does then I could update the data in there too.
My session IDs are MD5(fb_id + secret) so I could easily edit their session. The question is how can I detect if the session exists.
If
$_SESSION(or$HTTP_SESSION_VARSfor PHP 4.0.6 or less) is used, useisset()to check a variable is registered in$_SESSION.