สอบถามเกี่ยวกับการค้นหาโดยรับค่ามาหลาย ๆ ค่า Search PHP

<?php
$keyword[0] = $_POST['keyword0'];
$keyword[1] = $_POST['keyword1'];
$keyword[2] = $_POST['keyword2'];
$keyword[3] = $_POST['keyword3'];
$keyword[4] = $_POST['keyword4'];
$keyword[5] = $_POST['keyword5'];
$keyword[6] = $_POST['keyword6'];
$keyword[7] = $_POST['keyword7'];
$keyword[8] = $_POST['keyword8'];
$keyword[9] = $_POST['keyword9'];
$keyword[10] = $_POST['keyword10'];
//$arr=array("$keyword[0]","$keyword[1]","$keyword[2]","$keyword[3]","$keyword[4]","$keyword[5]","$keyword[6]","$keyword[7]","$keyword[8]","$keyword[9]","$keyword[10]");
$in_key = "( '".implode("','", $keyword). "' )";
$sqlprice = "select * from oc_pricelist where PartNo in $in_key ";
echo $sqlprice, "<br>\n"; // echo for check SQL Statement
$pricequery = mysql_query($sqlprice);
While($rowprice = mysql_fetch_array($pricequery)){
	$shprice = $rowtag['Price'];
	$shpart = $rowtag['PartNo'];
	echo "price $shprice no $shpart "; 
}
?>

$pricequery = mysql_query($sqlprice);
While($rowprice = mysql_fetch_array($pricequery)){
$shprice = $rowtag[Price];
$shpart = $rowtag[PartNo];
echo "price $shprice no $shpart "; 
}

$sqlprice = "select * from oc_pricelist where PartNo IN (" . $str . ")";
$pricequery = mysql_query($sqlprice);
while($rowprice = mysql_fetch_array($pricequery)){
   $shprice = $rowtag[Price];
   $shpart = $rowtag[PartNo];
   echo "price $shprice no $shpart "; 
}

<?php
$keyword[0] = $_POST['keyword0'];
$keyword[1] = $_POST['keyword1'];
$keyword[2] = $_POST['keyword2'];
$keyword[3] = $_POST['keyword3'];
$keyword[4] = $_POST['keyword4'];
$qty[0] = $_POST['qty0'];
$qty[1] = $_POST['qty1'];
$qty[2] = $_POST['qty2'];
$qty[3] = $_POST['qty3'];
$qty[4] = $_POST['qty4'];
//รับค่า qty ตรงนี้ต้องเขียนแบบ $in_key หรือเปล่าครับ
$in_key = "( '".implode("','", $keyword). "' )";
$sqlprice = "select * from oc_pricelist where PartNo in $in_key ";
echo "<div align='center' style='width:300px auto;'><table width='300' border='1'><tr>\n";
	echo "<th width='120'> <div align='center'>รหัสสินค้า</div></th>\n";
	echo "<th width='60'> <div align='center'>จำนวน</div></th>\n";
	echo "<th width='60'> <div align='center'>ตัวละ</div></th>\n";
	echo "<th width='60'> <div align='center'>ราคา</div></th>\n";
	echo "</tr>\n";
$pricequery = mysql_query($sqlprice);
While($rowprice = mysql_fetch_array($pricequery)){
	$shprice = $rowprice['Price'];
	$shpart = $rowprice['PartNo'];
	//$shsum = ??? ตรงนี้ต้องการราคาที่ได้จากฐานข้อมูล * จำนวน
	echo "<tr><td><div align='center'>$shpart</div></td>\n";
	//$shqty เป็นการดึงค่าจำนวนที่เรากรอกที่หน้าฟอร์ม
	echo "<td><div align='center'>$shqty</div></td>\n";
	echo "<td><div align='center'>$shprice</div></td>\n";
	echo "<td><div align='center'>$shsum</div></td>\n";
	echo "</tr>\n";
	}
	$vat = $shsum*7/100;
	$total += $shsum+$vat;
	echo "<tr><th align='center'>ราคาทั้งหมด</th>\n";
	echo "<th align='right' colspan='3'>$shsum</th></tr>\n";
	echo "<tr><th align='center'>VAT 7%</th>\n";
	echo "<th align='right' colspan='3'>$vat</th></tr>\n";
	echo "<tr><th align='center'>รวมทั้งสิ้น</th>\n";
	echo "<th align='right' colspan='3'>$total</th></tr>\n";
	echo "</table></div>\n";
	?>

<div align='center' style='width:300px auto;'>
 <table width='300' border='1'>
 <tr>
  <th width='120' align="center">รหัสสินค้า</th>
  <!--<th width='210' align="center">รายละเอียด</th>-->
  <th width='60' align='center'>จำนวน</th>
  <th width='60' align='center'>ตัวละ</th>
  <th width='60' align='center'>ราคา</th>
 </tr>
    <?php
	$count = $_POST['keyword'];
	$Countkey = sizeof($count);
	for($i=0;$i<$Countkey;$i++){
	$Countqty = $qty[$i];
	$sqlprice = "select * from oc_pricelist where PartNo = '$keyword[$i]' ";
	$pricequery = mysql_query($sqlprice);
	$rowprice = mysql_fetch_array($pricequery);
	//$Description = $rowprice['Description'];
	$Price = $rowprice['Price'];
	$Showprice = number_format($Price);
	$Showpart = $rowprice['PartNo'];
	$QtyPrice = $qty[ array_search( $Showpart , $keyword ) ] * $Price;
	$Sumprice = number_format($QtyPrice, 2, '.', ',');
	$SumQty += (int)$QtyPrice;
	$Sumtotal = number_format($SumQty, 2, '.', ',');
	echo "<tr><td align='center'>$Showpart</td>\n";
	//echo "<td align='center'>$Description</td>\n";
	echo "<td align='center'>$Countqty</td>\n";
	echo "<td align='center'>$Showprice</td>\n";
	echo "<td align='right'>$Sumprice</td>\n";
	echo "</tr>\n";
}
	$Vat = $SumQty*7/100;
	$Total += $SumQty+$Vat;
	$NetTotal = number_format($Total, 2, '.', ',');
	$NetVat = number_format($Vat, 2, '.', ',');
	?>
	<tr><th align='center'>ราคาทั้งหมด</th>
	<th align='right' colspan='4'><?php echo $Sumtotal; ?></th></tr>
	<tr><th align='center'>VAT 7%</th>
	<th align='right' colspan='4'><?php echo $NetVat; ?></th></tr>
	<tr><th align='center'>รวมทั้งสิ้น</th>
	<th align='right' colspan='4'><?php echo $NetTotal; ?></th></tr>
	</table></div>