Calculating number of online visitors?

Posted by Syom on Stack Overflow See other posts from Stack Overflow or by Syom
Published on 2010-06-06T14:44:19Z Indexed on 2010/06/06 14:52 UTC
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php

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mysql

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AJAX

i need to show the number of online visitors, but there is a problem with selecting algoritm to do it! maybe i must create a table in DB, where i'll store ip addresses of visitors and time of visit! by so i can show the count of ip addresses, which's time >= NOW() - 10 minutes, for example...("now()-10 minutes" is just to show the logic, i know that this is not a function:)

is this goog way to go? or maybe it's better to use AJAX methods to store the data?

please give me an idea.

Thanks

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