ทำตะกร้าสินค้าที่เลือกสั่งซื้อ แต่ข้อมูลไม่ขึ้น รบกวนช่วยดูให้หน่อยค่ะ ขอบคุณค่ะ

session_start();
	include ("config.inc.php");
	session_register("cart");
	
	if($_REQUEST['act']=='add' && !empty($_REQUEST['p_id']))
	{
		if(@!in_array($p_id,$_SESSION['cart']))
		{
			$sql="select * from inventory where p_id={$_REQUEST['p_id']}";
			$query=mysql_query($sql) or die("error=$sql");
			$row=mysql_fetch_array($query);
			
			$_SESSION['cart'][$p_id]['id']=$row['p_id'];
			$_SESSION['cart'][$p_id]['name']=$row['p_name'];
			$_SESSION['cart'][$p_id]['price']=$row['price_unit'];
		}
		}
		if($_REQUEST['act']=='remove' && !empty($_REQUEST['p_id']))
		{
			unset($_SESSION['cart'][$p_id]);
		}


<form id="frmcart" name="frmcart" method="post" action="confirm.php">
    <table width="600" border="0" class="square">
        <tr>
        <td colspan="5" bgcolor="#cccccc"><span class="style1">ตะกร้าสินค้า</span></td>
          
        </tr>
        <tr>
          <td bgcolor="#EAEAEA">สินค้า</td>
          <td align="center" bgcolor="#EAEAEA">จำนวน</td>
          <td align="center" bgcolor="#EAEAEA">ราคา</td>
          <td align="center" bgcolor="#EAEAEA">ราคา/รายการ</td>
          <td align="center" bgcolor="#EAEAEA">remove</td>
        </tr>
        <?PHP
		if(!empty($_SESSION['cart']))
		{
			$k=0;
			foreach($_SESSION['cart'] as $item)
			{
            ?>
        <tr>

          <td width="334"><?PHP echo $item['name']?></td>
          <td width="46"><select name="qty[]" id="qty<?PHP echo $k?>" onchange="return calculator_cart(<?PHP echo $k?>,
			  <? echo sizeof($_SESSION['cart'])?>)">
            <? for($i=1;$i<=10;$i++){?>
            <option value="<? echo $i?>"><? echo $i?></option>
            <? }?>
          </select></td>
          
          
          <td width="57" align="center"><? echo $item['price']?>
            <input name="price[]" type="hidden" id="price<? echo $k?>" value="<? echo $item['price']?>" /></td>
          <td width="93" align="left"><? $sumprice=(empty($qty[$k]))?$item['price']:$item['price']* $qty[$k];?>
          
          
            <input name="sumprice[]" type="text" id="sumprice<?PHP echo $k?>" value="<? echo $sumprice?>"
 size="6" style="text-align:right;" readonly="readonly"/></td>


          <td width="46" align="center"><a href="cart.php?p_id=<?PHP echo $item['id']?>&act=remove">remove</a></td>
        </tr>
        <?PHP
	$k++;
	$totalPrice+=$sumprice;
}
?>
        <tr>
          <td colspan="3" bgcolor="#CEE7FF">Total</td>
          <td colspan="2" align="left" bgcolor="#CEE7FF">
          <input name="totalPrice" type="text" id="totalPrice" size="6" value="<? echo $totalPrice?>" readonly="readonly" style="text-align:right;"/></td>
        </tr>
        <?
	}
?>
        <tr>
          <td><a href="product.php">Back to product</a></td>
          <td colspan="4" align="right"><input type="submit" name="Submit2" value="checkout"/></td>
  </tr>
</table>
 </form>  </th>