ต้อการ query ข้อมูลจาก Table เก็บใส่ใน array 2 มิติเขียนยังไงคะ

$data = array(
	array(
		'id' => 1,
		'name' => 'A',
		'group' => 1,
		'day' => '01',
	),

	array(
		'id' => 2,
		'name' => 'B',
		'group' => 1,
		'day' => '01',
	),

	// ...
);

$sql="select * from insertstaff,disease where(insertstaff.dsID=disease.dsID)";
$result = mysql_db_query($dbname,$sql);
$num_rows = mysql_num_rows($result);
while($record = mysql_fetch_array($result)) {
	$stID = $record[stID]; // ID
	$dsID = $record[dsID]; // Group
        $dFrom = $record[dFrom]; // Day
}

$data = array(
	array(
		'id' => 1,
		'name' => 'A',
		'group' => 1,
		'day' => '01',
	),

	array(
		'id' => 2,
		'name' => 'B',
		'group' => 1,
		'day' => '01',
	),

	array(
		'id' => 3,
		'name' => 'C',
		'group' => 1,
		'day' => '02',
	),

	array(
		'id' => 4,
		'name' => 'D',
		'group' => 2,
		'day' => '01',
	),

	// ...
);

$udg = $group = array();

// หากรุ็บที่มี
foreach ($data as $row)
	$groups[] = $row['group'];

$groups = array_unique($groups);
sort($groups);

// แต่ละ group
foreach ($groups as $group)
{
	foreach ($data as $row)
	{
		if ($row['group'] != $group)
			continue;
		
		if ( ! in_array(array('group' => $group, 'day' => $row['day']), $udg))
			$udg[] = array('group' => $group, 'day' =>$row['day']);
	}
}

// ตัวแปร udg คือรายการไม่ซ้ำ unique day group

// คราวนี้ เอามาหาจำนวจากข้อมูลทั้งหมดอีกที
foreach ($udg as &$unique)
{
	$tmp = 0;
	foreach ($data as $row)
	{
		if ($row['group'] === $unique['group'] AND $row['day'] === $unique['day'])
			++$tmp;
	}
	$unique['size'] = $tmp;
}

// แสดงผลลัพท์
foreach ($udg as $result)
	echo 'Group: '.$result['group'].' Day: '.$result['day'].' = '.$result['size'], '<br />';

Group: 1 Day: 01 = 2
Group: 1 Day: 02 = 1
Group: 2 Day: 01 = 1

$data = array(
	array(
		'id' => 1,
		'name' => 'A',
		'group' => 1,
		'day' => '01',
	),

	array(
		'id' => 2,
		'name' => 'B',
		'group' => 1,
		'day' => '01',
	),

	array(
		'id' => 3,
		'name' => 'C',
		'group' => 1,
		'day' => '02',
	),

	array(
		'id' => 4,
		'name' => 'D',
		'group' => 2,
		'day' => '01',
	),

	// ...
);

$sql="select disease.dsID,insertstaff.dFrom from insertstaff,disease where(insertstaff.dsID=disease.dsID)";
			$result = mysql_query($sql);
			$arr = array();
			$i = 1;
			while ($show = mysql_fetch_array($result)) 
			{
				  $data[$i] = array('dsID' => $show['dsID'],'dFrom' => $show['dFrom']);
				  $i++;
			}

<? foreach ($udg as $result) if($result['dsID']==$dspdsID and $result['dFrom']==01) { echo $result['size'];} ?>