ช่วยด้วยครับ ผมจะตรวจสอบเงื่อนไขเวลากด checkbox ทำไงช่วยบอกที

<? $grantotal=0;
$notr=0;
if (isset ($_SESSION["ses_basket_items"])){
	$ses_basket_items=  $_SESSION["ses_basket_items"];
	$ses_basket_price=$_SESSION["ses_basket_price"];
	$ses_basket_amount=$_SESSION["ses_basket_amount"];
	$ses_basket_id=$_SESSION["ses_basket_id"];
			for ( $basket_counter=0; $basket_counter < $ses_basket_items; $basket_counter++ ){
					$sespro_price = $ses_basket_price[$basket_counter];
					$quantity = $ses_basket_amount[$basket_counter];
					$sespro_id = $ses_basket_id[$basket_counter];
					$sumprice=$sespro_price*$quantity;
						if($quantity>0){
						$grantotal=$grantotal+$sumprice;
						++$notr;
//หาจำนวนใน Stock
$sql_stock="select pro_total from products  where no=".$sespro_id;
$query=mysql_query($sql_stock);
$Rs_stock=mysql_fetch_array($query);
$db_stock=$Rs_stock["pro_total"];
	?>

if (isset ($_SESSION["ses_basket_items"])){
	$name=$_POST['name'];
	$addr=$_POST['addr'];
$valid_uname=$rs["cus_id"];

//รหัสรายการสั่งซื้อ
	$sql_max="select MAX(or_id) as neworder from orders";
	$maxrs=mysql_db_query($db,$sql_max);
	$result_max = mysql_fetch_array($maxrs);
	$neworder=$result_max["neworder"]+1;
$_SESSION['currorderid']=$neworder;//ใบสั่งซื้อปัจจุบัน
//tb-order
$sql_insert="insert into orders (or_id,cus_id,cus_full,cus_add,or_date)
			     values ($neworder,'$memid','$name','$addr',now())";
mysql_query($sql_insert) or die("Error Ins  Table orders");

//order_item
	$ses_basket_items=  $_SESSION["ses_basket_items"];
	$ses_basket_price=$_SESSION["ses_basket_price"];
	$ses_basket_amount=$_SESSION["ses_basket_amount"];
	$ses_basket_id=$_SESSION["ses_basket_id"];
			for ( $basket_counter=0; $basket_counter < $ses_basket_items; $basket_counter++ ){
					$sespro_price = $ses_basket_price[$basket_counter];
					$quantity = $ses_basket_amount[$basket_counter];
					$sespro_id = $ses_basket_id[$basket_counter];
					$sumprice=$sespro_price*$quantity;
					if($quantity>0){
						$sql_insertItem="insert into order_item (or_id,pro_id,item_price,price_total) 
												values ($neworder,$sespro_id,$sumprice,$quantity)";
					mysql_query($sql_insertItem) or die("Error Ins order_item");
			}
		}
session_unregister("ses_basket_items");
session_unregister("ses_basket_price");
session_unregister("ses_basket_amount");
session_unregister("ses_basket_id");
}
?>