A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 8: Plug-in 51 - Users Online

One of the things that drives webmasters crazy is the fact that getting the ball rolling and building up a user base is very hard, but the more users you have the easier it is to get more. Why? One answer has to be that people don't want to feel alone on a website. So what better way to reassure them than to display the number of users currently using your website? And that's what this plug-in will do for you; it lists the total number of people who have used your website within a recent period decided by you.

The Figure shows a web page with five active users.