cookies - typo3 - undo "setSessionCookie" -

i trying implement "stay logged in" functionality in typo3 (using extbase), when user checks checkbox named "rememberme", session cookie set:

    //rememberme ?     if($user->getrememberme() == 1){         $reflection = new \reflectionclass($globals['tsfe']->fe_user);         $setsessioncookiemethod = $reflection->getmethod('setsessioncookie');         $setsessioncookiemethod->setaccessible(true);         $setsessioncookiemethod->invoke($globals['tsfe']->fe_user);     }else{         // ???      } 

this works fine, problem - do when user no longer wants permanently logged in? if checkbox unchecked - how undo session cookie without logging out user? possible?

thanks!

i think normal behavior delete the permanently-logged-in-information @ moment user logs out. imho logical , behavior.