มีปัญหาเรื่องการคำนวณราคาสินค้าของตะกร้าสินค้าครับ รบกวนพี่ๆช่วยหน่อยครับ

<form action="" method="post" enctype="multipart/form-data">
     
                		<table align="center" width="800" bgcolor="#CCCCCC">
                        
                        	<tr>
                            		<td colspan="5"><h2 id="titleall">ตะกร้าสินค้าของคุณ</h2></td>
                            </tr>
                            <tr align="center" >
                            
                            	<th>ลบ</th>
                                <th>สินค้า</th>
                                <th>จำนวน</th>
                                <th>ราคา</th>
                            </tr>
                            
                        <?php 
					
							
						$total = 0;
						global 	 $con;
		
						$ip = getIp();
	
						$sel_price = "Select * From fitup_cart where fitup_c_ip_add='$ip'";
	
						$run_price = mysqli_query($con, $sel_price);
	
						while ($p_price=mysqli_fetch_array($run_price)){
	
						$pro_id = $p_price['fitup_c_id'];
		
						$pro_price = "Select * From fitup_products where fitup_pd_id='$pro_id'";
		
						$run_pro_price = mysqli_query($con, $pro_price);
		
						while ($pp_price=mysqli_fetch_array($run_pro_price)){
			
						$product_price = array($pp_price['fitup_pd_price']);
						$product_title = $pp_price['fitup_pd_title'];
						$product_img = $pp_price['fitup_pd_img'];
						$single_price = $pp_price['fitup_pd_price'];
						
						$values = array_sum($product_price);
						
						$total += $values;
									
						
						?>
                        
                        <tr align="center">
                        		 <td><input type="checkbox" name="remove[]" value="<?php echo $pro_id; ?>"/></td>
                                
                                <td align="left"><?php echo $product_title; ?><br />
                                
                              	
                                
                                
                                </td>
                                <td><input type="number" class="InputNum" name="qty" value="<? echo $_SESSION['fitup_c_quantity'];?>"  size="3" min="1" max="5" /></td>
                               
                                <?php 
								
								
								if(isset($_POST['update_qty'])) {
																								
									$qty = $_POST['qty'];	
									
									$update_qty = "update fitup_cart set fitup_c_quantity='$qty'";
									
									$run_qty = mysqli_query($con, $update_qty);
									
									$_SESSION['fitup_c_quantity']=$qty;
									$total =$total*$qty;
									
								}
								
								
								 ?>
                                
                                
                                <td><?php echo $single_price; ?> บาท</td>
                                
                        </tr>
                        
                       
                        
                        
                        <?php } } ?>
                        
                         <tr align="right">
                         	<td colspan="4"><b>ราคาทั้งหมด: <?php echo $total; ?> บาท  </b></td>
                       
                         </tr>
                           
                         <tr align="center">
                         
                         		<td colspan="2"><input type="submit" name="update_cart" value="ลบสินค้า"/> </td>
                                <td><input type="submit" name="continue" value="ซื้อสินค้าต่อ"/> <input type="submit" name="update_qty" value="คำนวณราคา"/>  </td>
                                <td><button><a href="checkout.php" style="text-decoration:none; color:black;">checkout</a></button> </td>
                                
                         </tr>
                        
                        </table>
                
                </form>
                
                <?php 
				
				
				
					
					
					$ip = getIp();
					
					if(isset($_POST['update_cart'])) {
																								
						foreach ($_POST['remove'] as $remove_id) {
							
						$delete_product = "delete from fitup_cart where fitup_c_id='$remove_id' AND fitup_c_ip_add='$ip'";	
						
						$run_delete = mysqli_query($con, $delete_product);
									
						if ($run_delete) {
						
						echo "<script>window.open('cart.php','_self')</script>";
						
						}
					
						}
					}
					if(isset($_POST['continue'])) {
					
					$total = 0;	
					echo "<script>window.open('index.php','_self')</script>";	
					}
					
					
					
					
				
					
				
				?>               
                 

// creating the shopping cart
function fitupcart(){

if(isset($_GET['add_cart'])){
	
	global $con;
	
	$ip = getIp();
	
	$pro_id = $_GET['add_cart'];
	
	$check_pro =  "Select * From fitup_cart where fitup_c_ip_add='$ip' AND fitup_c_id='$pro_id'";
	
	$run_check = mysqli_query($con, $check_pro);
	
	if(mysqli_num_rows($run_check)>0) {
		
	echo "";
		
	}
	else {
		
	$insert_pro = "insert into 	fitup_cart (fitup_c_id,fitup_c_ip_add) values ('$pro_id','$ip')";
	
	$run_pro = mysqli_query($con, $insert_pro);
	
	echo "<script>window.open('index.php','_self')</script>";	
	}
}
}