[support] administrator: how can I force user log-off?

[sivaji j.g]

On Sat, Jul 30, 2011 at 2:32 AM, Ms. Nancy Wichmann
<nan_wich at bellsouth.net> wrote:
> In settings.php, you can define how long a cookie is good for. Once it
> expires, they must log in again. The standard setting is 3 weeks and 2 days,
> so they may not have an auto-reload -- they just aren't being bounced off.
> You can also set this to 0 and have the cookie get deleted when they close
> the browser.
>

This is fine but when the PHP garbage collection is not in place or
misconfigured it won't work as expected. Well there is a module for
that http://drupal.org/project/session_expire