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I want the post to change color for the people that have not seen the post..
what's the best way to check if a user have seen a post or not??
..without spamming the db with all the nick's who have seen the post..
Have you considered using cookies? Based off the system that allows you to view whether or not a thread or forum you are viewing has new posts since your last visit. The cookie would track the current user session as well.
hm, but what about the bug in phpbb where all the new post's vansishing sometimes?
and at the end of the session.. should I save it in the db, for each user or what?