How to count online users and guest for the last 30 minutes?

[fpjkaba]

How to count online users and guests for the last 30 minutes on my site?

I'm using mysql, php and apache for windows.

Thanks.

[Dormilich]

either check the server's logfiles or write a script that is called in every page and collects the data on request.

[fpjkaba]

Is it enough that I collect only the IP address and store it in DB? If not what more data should I collect?

Thanks!

[Dormilich]

for a basic counter this should be enough. anyways, the more data you collect, the better will you statistic be.

If you're fine with it, you can use one of the countless counters* available. this will save you the trouble of programming it yourself.

* what a pun.....

[Markus]

You're also going to need to store the time the user visits, too..