mysql — PHP язык об обновлении корзины покупок

Извините, у меня проблема с обновлением корзины покупок в PHP. Я искал решение для этого в течение 2 дней, но безрезультатно. Может кто-нибудь дать мне совет?

<?php
if(isset($_POST["act"]))
{
if(isset($_POST["updspc"]))
{
$id_form=$_POST["id_form"];
$countid=count($id_form);
$sl=$_POST["p_qty"];
$total=$_POST["total"];
if(isset($_SESSION["user"]))
{
for($i=0;$i<$countid;$i++)
{
if($sl[$i]<=0)
$del=mysql_query("delete from pia_spcart where id='$id_form[$i]' and p_stt1='addspcart1'");
else{
$tt[$i]=$total[$i]*$sl[$i];
$sql2="update pia_spcart set p_qty=$sl[$i] where user='$user' AND id='$id_form[$i]' and p_stt1='addspcart1'";
$sql2.=';';
echo "sql2: $sql2<hr>";
$kq2=mysql_query($sql2);
}

}
}
}

if(isset($_POST["delspc"]))
{
$delete=$_POST["delete"];
$deletecount=count($_POST["delete"]);
if($deletecount==0)
echo "<script>alert('Please choose products to delete');</script>";
else{
for ($j=0;$j<$deletecount;$j++)
{
$SQL_delspc = "DELETE FROM pia_spcart WHERE user='$user' and id='$delete[$j]' and p_stt1='addspcart1'";
$kq_delspc=mysql_query($SQL_delspc);
$n+=mysql_affected_rows();
}
}
}

if(isset($_POST["order"]))
{
$id_form=$_POST["id_form"];
$countid=count($id_form);
$now=date("Y-m-d H:i:s");
$p_qty=$_POST["p_qty"];
//      $total=$_POST["total"];
for($k=0;$k<$countid;$k++)
{
//$id_f=implode($_POST["id_form"], "','");
$sql_kt="select * from pia_spcart where id='$id_form[$k]' and user='$user' and p_stt1='order'";
//  echo "$sql_kt<hr>";
$kq_kt=mysql_query($sql_kt);
if(mysql_num_rows($kq_kt)==0)
{
$sql_order="update pia_spcart set p_stt1='order',p_orddate='$now' where id='$id_form[$k]' and user='$user' and p_stt1='addspcart1'";
$kq_dathang=mysql_query($sql_order);
echo "<script>window.location='index.php?pia=listcart';</script>";
}
else
{
while($r_kt=mysql_fetch_array($kq_kt))
{
$sl_kt=$r_kt["p_qty"];
//  echo "$sl_kt<hr>";
$sql_del="delete from pia_spcart where user='$user' and id='$id_form[$k]' and p_stt1='addspcart1'";
$kq_del=mysql_query($sql_del);
$sql_order="update pia_spcart set p_orddate='$now',p_qty=$sl_kt+$p_qty[$k] where id='$id_form[$k]' and user='$user' and p_stt1='order'";
$sql_order.=';';
$kq_dathang=mysql_query($sql_order);
echo "<script>window.location='index.php?pia=listcart';</script>";

}
}
}                   //echo "sql: $sql_order";
}

}
?>
<table width="560" border="0" cellspacing="0" cellpadding="0" style="border:1px solid #333">
<form method="post" name="form">
<tr>
<td colspan="6" class="tieude" align="center">YOUR CART</td>
</tr>
<tr bgcolor="#ad2200" align="center" height="30" style="font-weight:bold">
<td width="50" style="border-right:1px solid #666"><font color="#FFFFFF">No</font></td>
<td width="110" style="border-right:1px solid #666"><font color="#FFFFFF">Product</font></td>
<td width="60" style="border-right:1px solid #666"><font color="#FFFFFF">Quantity</font></td>
<td width="95" style="border-right:1px solid #666"><font color="#FFFFFF">Price</font></td>
<td width="95" style="border-right:1px solid #666"><font color="#FFFFFF">SubTotal</font></td>
<td width="50" ><font color="#FFFFFF">Delete</font></td>
</tr>
<?php
$user=$_SESSION["user"];
$sql="select pia_spcart.*,pia_products.* from pia_spcart,pia_products where pia_spcart.id=pia_products.id AND pia_spcart.user='$user' AND pia_spcart.p_stt1='addspcart1'";
$kq=mysql_query($sql);
$i=0;
$tien=0;
if(mysql_num_rows($kq)==0)
echo "<tr><td colspan=6 height=30 align=center>No product in your cart!</td></tr>";
else{
while($r=mysql_fetch_array($kq))
{
$id=$r["id"];
$tensp=$r["p_prodname"];
if(isset($_SESSION["p_qty"])) $p_qty=$_SESSION["p_qty"];
else $p_qty=$r["p_qty"];
$price=$r["p_price"]; $price2=number_format($price,0,'','.');
if($price==0) $s="(contact)"; else $s=$price2." SGD";
$total=$price*$p_qty; $total2=number_format($total,0,'','.');
if($total==0) $t="(contact)"; else $t=$total2." SGD";
$totaltien=$totaltien+$total;$totaltien2=number_format($totaltien,0,'','.');
if($totaltien==0) $tt="(contact)"; else $tt=$totaltien2." SGD";
$i++;
?>
<tr align="center" height="30" >
<td width="50" style="border-right:1px solid #666; border-bottom:1px solid #666"><?php echo $i; ?></td>
<td width="110" style="border-right:1px solid #666; border-bottom:1px solid #666"><?php echo $tensp; ?></td>
<td width="60" style="border-right:1px solid #666; border-bottom:1px solid #666">
<input type="text" name="p_qty[]" value="<?php echo $p_qty ?>" style="width:30px" />
<input type="hidden" name="id_form[]" value="<?php echo "$id"; ?>"  />
<input type="hidden" name="total[]" value="<?php echo "$total"; ?>" />

</td>
<td align="right" width="95" style="border-right:1px solid #666; border-bottom:1px solid #666; padding-right:3px"><?php echo $s; ?> </td>
<td align="right" width="95" style="border-right:1px solid #666; border-bottom:1px solid #666; padding-right:3px"><?php echo $t; ?> </td>
<td width="50" style=" border-bottom:1px solid #666" >
<input type="checkbox" name="delete[]" value="<?php echo "$id"; ?>"/>
</td>
</tr>
<?php
}
}
if(mysql_num_rows($kq)==0)
echo "";
else
echo "<tr>
<td height=30 colspan=6 align=right style=\"padding-right:5px; padding-bottom:5px; color:#Fff\">Subtotal need to pay: $tt </td></tr>
<tr>
<td colspan=\"6\" style=\" border-bottom:1px solid #666\" bgcolor=\"#fff\" align=\"center\" height=\"35\">
<input type=\"button\" name=\"continueshopping\" value=\"Continue Shopping\" class=\"button3\" onmouseover=\"style.background='url(images/button-150-2-o.png)'\" onmouseout=\"style.background='url(images/button-150-o.png)'\" onclick=\"document.form.action='index.php'; document.form.submit();\" />

<input type=\"submit\" name=\"updspc\" value=\"Update\" class=\"button\" onmouseover=\"style.background='url(images/button-2-o.gif)'\" onmouseout=\"style.background='url(images/button-o.gif)'\" onclick=\"document.form.submit();\" />

<input type=\"submit\" name=\"delspc\" value=\"Delete Cart\" class=\"button2\" onmouseover=\"style.background='url(images/button-110-2-o.png)'\" onmouseout=\"style.background='url(images/button-110-o.png)'\" onclick=\"document.form.submit();\" />

<input type=\"submit\" name=\"order\" value=\"Order\" class=\"button2\" onmouseover=\"style.background='url(images/button-110-2-o.png)'\" onmouseout=\"style.background='url(images/button-110-o.png)'\" onclick=\"document.form.submit();\"/>
</td>
</tr>";
?>
<input type="hidden" name="act" />
</form>
</table>
<div style='font-size:11px; line-height:20px; color:#FF0000; width:560px'></div>

Слишком сложно найти ошибку, я вставил echo "sql2: $sql2<hr>"; и я вижу следующее уведомление на сайте:
sql2: update pia_spcart set p_qty=6 where user='' AND id='2' and p_stt1='addspcart1';

Я узнал проблему с пользователь но моя БД в порядке.

На самом деле, я мог что-то вставить в свою БД, но не мог изменить информацию о продукте или удалить ее. Такие как «Изменить функцию личной информации» и «Корзина».