how to destroy

[jannoy]

how can i destroy
HTTP_COOKIE_VARS["file"];

in my logout

[examancer]

You can remove the variable from PHP by doing unset($HTTP_COOKIE_VARS['file']); or unsert($_COOKIE['file']);

To remove the cookie from the clients machine, you must replace it with a cookie that has already expired, which will tell the browser to delete it. Like so:

setcookie("file", "", time() - 3600);

see this url for more info:

http://www.php.net/manual/en/features.cookies.php