รบกวนพี่ๆแนะนำการเช็คค่าภายใน for หน่อยครับ แก้ไขยังไงดี

$buff = array();
for($set=0;$set<2;$set++) {
	$query = "....";
	while($dbarr = mysql_fetch_assoc($query)) {
		if( !isset( $buff[$dbarr['id'] )) {
			$buff[$dbarr['id']] = array( 0 , 0 , 0);
		}
		$buff[$dbarr['id']][$set] = $dbarr['balance']; 
		$buff[$dbarr['id']][2] += $dbarr['balance']; 
		echo "id ".$dbarr['id']."&nbsp;&nbsp;&nbsp;Balance&nbsp;".$dbarr['balance']."<br>";
	}
}
foreach($buff as $key=>$total){
    echo "id = {$key}&nbsp;&nbsp;&nbspBalance&nbsp;{$total[2]}<br>";
}