unset cookies using php

This site is best viewed in a modern browser with JavaScript enabled.

Hai friends

I need one clarification for cookies . How to distroy the cookies using php .
Please help me

Thanks
vssp

To delete a cookie set the expiration date in the past, this will trigger the clients browser removal mechanism:

<?php
// set the expiration date to one hour ago
setcookie ("TestCookie", "", time() - 3600);
?>