รบกวนสอบถามเกี่ยวกับใช้ฟังก์ชั่น preg_match กับการแสดงค่าหน่อยครับ

$nameSQL = "SELECT * FROM nc_workinglist WHERE Order_ID = '0000000013'";

$namequery = mysql_query($nameSQL);

if (mysql_num_rows($namequery) == 1)
{
	$FetchArray = mysql_fetch_array($namequery);
	mysql_fetch_array ($namequery);
	mysql_close();
	
	echo $DBspeed = $FetchArray['Attribute1']."<br>";
	$DBspeedinter = $FetchArray['Attribute12']."<br>";
	$DBOrder_ID = $FetchArray['Order_ID']."<br>";

}

preg_match("/[[:digit:]]+\.?[[:digit:]]*/", $DBspeed , $price1 );
echo $price1[0];

$findme_1 = 'K';
$findme_2 = "k";
$findme_3 = "M";
$findme_4 = "m";

echo $result_1 = strpos($DBspeed, $findme_1)."<br>";
echo $result_2 = strpos($DBspeed, $findme_2)."<br>";
echo $result_3 = strpos($DBspeed, $findme_3)."<br>";
echo $result_4 = strpos($DBspeed, $findme_4)."<br>";

if ($result_1 != "")
{
	$result = "Kbps";
}
else if ($result_2 != "")
{
	$result = "kbps";
}
else if ($result_3 != "")
{
	$result = "Mbps";
}
else if ($result_4 != "")
{
	$result = "mbps";
}
else
{
	$result = "ไม่มี";
}

echo $result;