Check if user closed the page in PHP?

Question

I made a chat using PHP and JavaScript chat and there is a disconnect button which removes user from the chat removing him from user list first. But if the user closes brows

Answer 1

The answers to all the questions asked by the OP are covered in the section in the manual about connection handling:

http://uk3.php.net/manual/en/features.connection-handling.php

No Ajax.

No Javascript.

No keep alives.

C.