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At any forum , you can see if a specific member is online or offline, or generally , how can I detect online visitors accurately who are visiting my website at the moment ...

Thanks in advance

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Last Post by diafol
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That is typically done by logging the time when a given user (or a guest, if you want that) was last seen.
Once a user hasn't been seen for some predetermined amount of time, he is considered off line.

This is really the only reliable method, given the stateless nature of the web.

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I think you can done this idea by session (for members)

like if session user is available so the user is here

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IP address is unreliable.
DB sessions could be a way to go, although last_impression timestamp for logged on users can be used as a cut-down version. You need a clean up with these though (php script or MySQL trigger), unless you run a cron job every 20 minutes or so.

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