public static function getRoleUsers($role)
    {
        global $PPHP;
        $db = $PPHP['db'];

        $out = $db->selectList(
            "
            SELECT userId FROM users_roles
            WHERE role=?
            ORDER BY userId ASC
            ",
            array($role)
        );
        return (is_array($out) ? $out : array());
    }