Hi

My bank uses two processes. If a user is inactive for more than about 5
minutes it forces you to log in again. This is done server side and just
does not allow you to do anything if your last activity was more than 5
minutes ago. It probably also marks the session as logged out.

It also uses JavaScript <body onUnload=''> to log you out when you close the
window. Not sure if this works when you just close the browser.

I do have a suggestion, which may or may not meet your needs.

When the user logs in, open a popup window  and set focus to the main window
<body unload=self.focus()>  so the popup becomes a popunder. Using a header
or meta tag refresh the popunder once a minute and log the session as
already discussed, but with a timeout of 2 minutes, so it will be up to
date. This will tell you that the user has a browser open.

This might be enough for your needs

If not you could use <body onUnload=''> to post a form to the popup window
when the main window closes. This logs out when the user closes the main
window. The only exception will be if the user navigates away from the site.
If you need to, you could prevent this by displaying site content in another
popup window with no navbar and no external links.

http is stateless, so you cannot do a true session like Messenger but the
above is reasonably close :)

HTH

Peter

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-----Original Message-----
From: Bernain, Fernando G. [mailto:[EMAIL PROTECTED]]
Sent: 03 January 2003 20:31
To: 'Peter Beckman'; Hutchins, Richard
Cc: Bernain, Fernando G.; '[EMAIL PROTECTED]'
Subject: RE: [PHP-DB] Users on line


I'm thinking in something similar to ICQ or MSN. This is an app for a few
number of users (less than 50) but they need to know who are online when
they are working in the app too!!! Maybe I can use the table online and
insert then name of the user when he login the app... but I still have the
problem of the logout...

I was looking for something (like a function?) in apache or php who tells me
the "open sessions" at a moment...

Fernando Bernain
Senior A
Business Process Outsourcing

KPMG Argentina
Tel: 54 11 4316 5754
Fax: 54 11 4316 5734
[EMAIL PROTECTED]




-----Original Message-----
From: Peter Beckman [mailto:[EMAIL PROTECTED]]
Sent: Friday, January 03, 2003 4:49 PM
To: Hutchins, Richard
Cc: Bernain, Fernando G.; '[EMAIL PROTECTED]'
Subject: RE: [PHP-DB] Users on line


I agree; it'd be nice if there was some sort of code that'd be executed
when someone closed their browser.  There is the javascript "on_exit()" or
something where the user, when they leave a domain, is executed.  However,
this only works if they click off the site, not if they close their
browser.  Plus if they go to another site and come back within 5/10/15
minutes, are they still considered "logged in?"

It's fairly impossible to keep track of when users are or are not using the
site that is not really complex.  What if they are reading an article, run
to the restroom, finish reading the article and then click on another page?
I figure they are "idle" after 15 minutes.  If they continue to surf the
site in an hour or two, their session will be updated (if your sessions
last long enough, or if not they'll probably be automatically re-logged in
which case they'd be updated/re-inserted in the online table), and will
once again be counted as a person online.

One example is forcing people to be logged out after 10 minutes of
inactivity.  Bank of America does this, most likely using javascript.
However, if yahoo! did this when I was reading my mail and I stepped away,
I'd be annoyed.  Most sites allow you to be logged in forever ("Remember
me") so forcing people to log out just to be able to count who is online
seems silly.

If you just want to keep track of how many people are logged in, I'd just
say that logged in is defined as having an active logged in session that
was active in the last 5/10/15 minutes.  I'm almost positive that method is
how most web sites determine time online.

Peter

On Fri, 3 Jan 2003, Hutchins, Richard wrote:

> How would the online table be maintained if a user simply closes out the
> browser without actually logging out properly? I'm not at all experienced
> with sessions, but closing the browser should terminate the session,
> correct? Bernain may want to delete from his online table every hour or so
> to catch those people who have not properly logged out (assuming the
"delete
> from online..." query is only fired when they click on a "log out"
button).
>
> I'm not slagging Peter's recommendation. I was thinking this solution
> through as well, but was a bit stuck when it came to users just closing
> their browsers without logging out.
>
> > -----Original Message-----
> > From: Peter Beckman [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, January 03, 2003 2:32 PM
> > To: Bernain, Fernando G.
> > Cc: '[EMAIL PROTECTED]'
> > Subject: Re: [PHP-DB] Users on line
> >
> >
> > Create a new table named online:
> >
> > id
> > time (int unix timestamp)
> > uid (int probably, user ID of user in question, relating to a
> > user info table?)
> > sessid (char 32 I think)
> >
> > When the user logs in, I assume you set the session.  Insert
> > a row with the
> > current time (unix_timestamp(now()), User ID and the output
> > of session_id()
> > in PHP.  This way you can run a query on that table at any
> > time in one of
> > two ways.
> >
> >  1. select count(id) from online where
> > time>=(unix_timestamp(now())-900)
> >
> >     This will give you the number of people who at least
> > logged in in the
> >     last 15 minutes.  This isn't very accurate though... so
> >
> >  2. If not already, put sessions in your SQL table.  This way
> > you can run a
> >     query like (and John Holmes, please feel free to clean up
> > my joins, i
> >     suck at them):
> >
> >     select count(*) from online,sessions where
> >     online.sessid=sessions.sessid and
> >     sessions.date>=(unix_timestamp(now())-900)
> >
> >     This will give you the number of users who have done
> > anything on the
> >     site in the last 15 minutes.  Change the 900 to 600 or
> > 300 for 10 or 5
> >     minutes respectively.
> >
> > Every week or so you'll want to "delete from online where time>=[some
> > number here, unix_timestamp(now()) minus how long you want to
> > leave those
> > entries there]".
> >
> > Depending on how often you want to do this and how busy your
> > site is and
> > how focused on performance you are, I'd advise running it
> > once per minute
> > and every time someone logs in, rather than once per page
> > view, and put the
> > values generated into a text file and read it in with readfile().
> >
> > Peter
> >
> > On Fri, 3 Jan 2003, Bernain, Fernando G. wrote:
> >
> > > I'm working in an app that requires to know who are "on
> > line". When the user
> > > login the app, I use session in order to storage de name
> > and login.  Its
> > > posible to do this???
> > >
> > > Thanks!
> > >
> > > Fernando Bernain
> > > Senior A
> > > Business Process Outsourcing
> > >
> > > KPMG Argentina
> > > Tel: 54 11 4316 5754
> > > Fax: 54 11 4316 5734
> > > [EMAIL PROTECTED]
> > >
> > >
> > >
> > >
> > >
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> > Peter Beckman
> >  Internet Guy
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Peter Beckman                                                  Internet Guy
[EMAIL PROTECTED]                             http://www.purplecow.com/
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