public function getGroupById($id_group)
    {
        if (array_key_exists($id_group, $this->byid)) {
            return $this->byid[$id_group];
        }

        return false;
    }
public function getGroupById($id_group)
    {
        if (array_key_exists($id_group, $this->byid)) {
            return $this->byid[$id_group];
        }

        return false;
    }
public function getGroupById ( $ id_group ) { if ( array_key_exists ( $ id_group , $ this -> byid ) ) { return $ this -> byid [ $ id_group ] ; } return false ; }
Returns a group by it's id

@param int $id_group
Internal id of group

@return mixed|boolean
Returns a group by it s id