New "Remember me" cookie content format could potentially cause problems for users login with "."

// Now if the remember me feature is on and the user checked the rememberme checkbox then ...
   if ($rememberme != 'disabled') {
       if (isset($_REQUEST['rme']) && $_REQUEST['rme'] == 'on') {
           $hash = $userlib->get_user_hash($_REQUEST['user']);
           $hash = $userlib->create_user_cookie($_REQUEST['user']);
           $time = substr($hash,strpos($hash,'.')+1);
           setcookie($user_cookie_site, $hash.'.'.$user, $time, $cookie_path, $cookie_domain);
           $logslib->add_log('login',"got a cookie for $remembertime seconds");
       }
   }

md5($_SERVER['REMOTE_ADDR'].$_SERVER['HTTP_USER_AGENT']).(date('U') + $remembertime).$user

function get_user_by_cookie($hash) {
        list($check,$expire,$userCookie) = explode('.',$hash);
    if ($check == md5($_SERVER['REMOTE_ADDR'].$_SERVER['HTTP_USER_AGENT'])) {
      $query = 'select `user` from `tiki_user_preferences` where `prefName`=? and `value`=? and `user`=?';
      $user = $this->getOne($query, array('cookie',"$check.$expire", $userCookie));
      if ($user) {
        if ($expire < date('U')) {
          $query = 'delete from `tiki_user_preferences` where `prefName`=? and `value`=?';
          $user = $this->query($query, array('cookie',$hash));
          return false;
        } else {
          return $user;
        }
      }
    }
    return false;
  }

function get_user_by_cookie($hash) {
        list($check,$expire,$userCookie) = explode('.',$hash,3);
    if ($check == md5($_SERVER['REMOTE_ADDR'].$_SERVER['HTTP_USER_AGENT'])) {
      $query = 'select `user` from `tiki_user_preferences` where `prefName`=? and `value`=? and `user`=?';
      $user = $this->getOne($query, array('cookie',"$check.$expire", $userCookie));
      if ($user) {
        if ($expire < date('U')) {
          $query = 'delete from `tiki_user_preferences` where `prefName`=? and `value`=?';
          $user = $this->query($query, array('cookie',$hash));
          return false;
        } else {
          return $user;
        }
      }
    }
    return false;
  }