public static function search_roles($group, $role = '')
	{
		if ($role == '')
		{
			return false;
		}

		$db =  \App::get('db');

		$query = "SELECT uidNumber FROM `#__xgroups_roles` as r, `#__xgroups_member_roles` as m WHERE r.id='" . $role . "' AND r.id=m.roleid AND r.gidNumber='" . $group->gidNumber . "'";

		$db->setQuery($query);

		$result = $db->loadColumn();

		$result = array_intersect($result, $group->members);

		if (count($result) > 0)
		{
			return $result;
		}
	}