Thanks Denno, effectively, I would also need the one that did not join.
So, since you're asking Barand, yes, I'm going to write it down, the meeting was the easier example I found.
Basically, it would be for a game, there are 100 members in a group that must attend to this meeting (getting if attended is simulated by a link triggered by the game).
(The game link triggered looks like this: http://host.com/?password=pass&youInfo=1&whatyouwant=2&... ).
I want them to join the server each Saturday and Sunday, it has been done with a 'if ($current_day == "Sat" || $current_day == "Sun") { }', but now, I need to know what to do in this if.
What has to be displayed like this: http://img4.hostingpics.net/pics/115542Sanstitre.png (Here is a google doc) and the color would define if the player has joined or not.
In order to see if the player hasn't joined, we'll get a list of all players name (a list registred in another table) and if they did not joined, then we add them as not attended.
Thanks again for your help .