logoff user with php *urgent*

Hello,

If somebody could help me with this one it would be very nice,

the story:
I need to check if a user is online or not at the moment i am doing a user
logoff with javascript but this is not browser proof so it doesn't work all
the time. or doing it with a for() statement that writes every 20 sec the
last unix time to a database, this doesn't work because the for() statements
stops executing the rest of the page so that doesn't work either

the problem:
i can only have one user online for a group, so i have to check if the first
that logges in for a group is online or not, i have a check time of 1 minut
so if a user logges off, a new user can login after a minut.

the reason:
so you think what is the problem put a logoff button on the screen and your
finished, well that would be the answer if i wasn't developing a page for
idiots that destroy the browser window by alt-f4 or the cross instead of the
logoff button.

so hope somebody hacked this problem before.

Thanks in advance

(sorry for the multi post)

G

In article <3f7bf275$0$58710$e4fe514c@news.xs4all.nl>, Spam sucks wrote:
> Hello,
>
> If somebody could help me with this one it would be very nice,
>
> the story:
> I need to check if a user is online or not at the moment i am doing a user
> logoff with javascript but this is not browser proof so it doesn't work all
> the time. or doing it with a for() statement that writes every 20 sec the
> last unix time to a database, this doesn't work because the for() statements
> stops executing the rest of the page so that doesn't work either
>
> the problem:
> i can only have one user online for a group, so i have to check if the first
> that logges in for a group is online or not, i have a check time of 1 minut
> so if a user logges off, a new user can login after a minut.


You can have function check_timeouts() and store_time() that are called
everytime a page is requested.

The store_time function only has to store the current_time.
The check_timeouts function has to compare current_time with stored_time.
If the difference for a user > 60, log the user out.

--
Visit my website at http://aardbei.madoka.be

"Spam sucks" <nomail> wrote in message
news:<3f7bf275$0$58710$e4fe514c@news.xs4all.nl>...
>
> I need to check if a user is online or not at the moment

You can't. All you can do is to figure out who accessed your
site within the last X minutes, hours, or days.

> so hope somebody hacked this problem before.

Of course. You must assume that the user is offline, unless you
have reasons to believe otherwise (e.g., a recent access to a page
on your site with that user's credentials).

Cheers,
NC