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script to tell me who, and how many users, are online
Best way to keep track of current online users
How should I count the people online on a PHP website at a given time, if they don’t have to be logged-in?
Use a cookie to identify unique users, and then just keep track of the last time accessed a PHP page. Then come up with a timeout mechanism – for example, if they have not accessed a page in 15 minutes then they are removed from the count.