I would like to see it in action, please. Thanks. -- Anas On 10/4/05, Silvio Porcellana <sporc@xxxxxx> wrote: > > Murray @ PlanetThoughtful wrote: > > > > Out of curiosity, does anyone know if it's possible to tell whether an > > individual session is still alive from PHP? I don't mean from within > > code being run for a particular user, but in code that, for example, > > might be executed by a cron job, which would examine a table in which > > session ids have been recorded automatically for each visitor, and > > determining which of those sessions are still theoretically alive? I > > suspect this isn't possible, but I've also learned to never > > underestimate the ingenuity of those faced with things that aren't > > possible. > > > > [Ok, I AM an AJAX fan] > > The problem with "normal" session management is that session data > (timestamp etc.) gets updated only when and if the user does something: > therefore, if he is reading an article and he doesn't click anywhere for > 10 minutes, he still is on your site, but you "lose" him. > > An alternative approach is the AJAX [1] one: you set up a JavaScript > 'setInterval' and call an "AJAX" function that makes a query to the PHP > script that updates the session (with the current timestamp, user_id, > whatever...) > Ok, I don't know if this makes much sense, but you end up with a script > that gets executed (without user interaction) every 'n' microseconds, so > your session data is always up to date (at maximum, with a delay of 'n' > * 2 microseconds). > The bad side of this is that you have a script that gets executed quite > often for every user visiting your pages: but, if you keep it minimal (a > couple of queries) the overhead isn't that much and you get a > *near-to-real* number of open sessions. > > I hope I made some sense: in any case feel free to ask, I just developed > something like this for a web site I'm working on (but we're still in > alpha), so if you want to see it in action, lemme know. > > Ciao! > Silvio > > [1] http://en.wikipedia.org/wiki/AJAX > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- Anas Mughal
