ช่วยดูให้ด้วยครับ ช่วยเช็คให้หน่อยครับ function return ทำไมค่าไม่มา

function fnc_returning1($arg1)
{
$sql_select1="SELECT detail_basicinformation FROM detail_basic_information LEFT JOIN basic_information ON detail_basic_information.basicinformation_id = basic_information.basicinformation_id WHERE basic_information.basicinformation_num = '$arg1'
AND detail_basic_information.detail_basicinformation_year = '$year'";
$result_select1 = mysql_query($sql_select1);
$select1=mysql_fetch_array($result_select1);
$data1 = $select1["detail_basicinformation"];    
	return $data1;
}

$data1 = fnc_returning1 (22);