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An on user logout event would be great.

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It would be nice to have an event for user logout. I have an add-on that creates some cookies and it would be nice to kill these cookies through an event when the user logs out.
 
Mnkras replied on at Permalink Reply
Mnkras
It wouldn't be consistent, if the user leaves the site, and they never hit logout, then its not fired.
jasonok6 replied on at Permalink Reply
Depends on what you are trying to accomplish. In my case I don't want cookies destroyed if the user leaves the site and goes somewhere else. I want cookies destroyed specifically when the user logs out.

The cookie example aside there are many cases where this type of functionality would come in handy. A user logout hook is common with CMS APIs.
Judder replied on at Permalink Reply
Judder
It's built into the logout function in 5.5.2 (and probably earlier).

You need to look for event 'on_user_logout'

and you can reference it in /concrete/models/user.php line 245

function logout() {
         // First, we check to see if we have any collection in edit mode
         $this->unloadCollectionEdit();
         @session_unset();
         @session_destroy();
         Events::fire('on_user_logout');
         if ($_COOKIE['ccmUserHash']) {
            setcookie("ccmUserHash", "", 315532800, DIR_REL . '/');
         }
      }