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06-16-2002 09:23 PM

Theory of how Who's Online Feature Works

Hi Peeps.

I am interested in adding a feature like who's online to my website. I am fairly confident in coding with PHP. What I need is basically the theory of how the Who's Online Feature works and more importantly how it realises a user is not looking at the board no more etc.

Thanks for any help which can be offered.

Mark Hensler

06-17-2002 02:50 AM

ascii flow chart (sort of)

Code:



updating session table..

--

ENTER



sql: DELETE FROM session_table WHERE timestamp>(now()-$session_timeout)



sql: UPDATE INTO session_table SET timestamp=now() AND session_id=$your_session_id



RETURN

--



reading sessions table..

--

ENTER



sql: SELECT * FROM session_table

php: print all returned records



RETURN

--

You'll have to define $session_timeout as an integer constant. This will signify how long to keep a session before killing it.

You'll also have to generate a unique $your_session_id and use it to track users.

06-17-2002 07:29 AM

Ahhh cool m8ty that helps a lot. One final question tho. When does the function to delete from the session table get executed and in which script? For Eg. Is that run everytime the forumlist is loaded?

Admin

06-17-2002 11:20 AM

There was a script for this at EvilWalrus.com (http://evilwalrus.com/) but the they have seem to delete all the snippets.

Mark Hensler

06-17-2002 04:05 PM

Depending on your traffic, you may run it everytime a page is hit, or once every X times. Or you could put it in a cron job and set it off every 5 minutes.

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