How to count online users on a website
<blockquote>
  <p><strong>Possible Duplicates:</strong><br>
  <a href="http://stackoverflow.com/questions/568835/script-to-tell-me-who-and-how-many-users-are-online">script to tell me who, and how many users, are online</a><br>
  <a href="http://stackoverflow.com/questions/1822921/best-way-to-keep-track-of-current-online-users">Best way to keep track of current online users</a>  </p>
</blockquote>



<p>How should I count the people online on a PHP website at a given time, if they don't have to be logged-in?</p>
