PHPit - Totally PHP » Creating a “Who’s Online” script with PHP: "Creating a “Who’s Online” script with PHP
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Introduction

In this tutorial I will show you how to create your own 'Who's Online' script, which is often found on message boards and other community scripts. We will first create a really simple script, and after that add a few more features like the location of each visitor. But first, let me explain how our 'Who's Online' script is going to work."