เขียนฟังก์ชั่นแบบนี้มันผิดตรงไหนหรอคะ ????????????????

function group_id_query(){
	$sSql = "SELECT Max([group_id]) AS max_group_id FROM tbl_spt_groupQuatity;";
	$result = odbc_exec($link,$sSql);
	while($row = odbc_fetch_array($result)){
		$max_group_id = $row['max_group_id'];
		
	}
	echo $max_group_id;
	return($max_group_id);
}

echo group_id_query();