How to update quantity of a specific or chosen item only? Php cart

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PHP

MySQL

Hello. I am having hard time fixing my current code which requires to update both items I have in cart. (For example I have 2 items in my cart, then my code doesn't update its quantity if the both items isn't filled out)
My desired output: May I ask for help in how can I update the quantity of the selected item in my cart without requiring the other if ever I have 2 or more cart items?

Thank you my code is pasted below

What I have tried:

<div class="container">
    <div class="row">
        <form action="" method="post">
        <table class="table table-border text-center w-auto m-auto">
            <thead>
                <tr>
                    <th> Shoe name</th>
                    <th> Shoe image </th>
                    <th> Quantity</th>
                    <th> Total price</th>
                    <th> Remove Item</th>
                    <th colspan="2"> Operations</th>
                </tr>
            </thead>
            <tbody>


                <!-- PHP to display dynamic datas from cart-->
                <?php
              global $conn;
              $get_ip_address = getIPAddress();  
              $total_price=0;
              $cart_query="select * from `cart_details` where ip_address='$get_ip_address'";
              $result=mysqli_query($conn,$cart_query);
              while($row=mysqli_fetch_array($result)){
                $shoe_id=$row['shoe_id'];
                $select_products="select * from `products` where shoe_id='$shoe_id'";
                $result_shoes=mysqli_query($conn,$select_products);
                while($row_shoe_price=mysqli_fetch_array($result_shoes)){
                  $shoe_price=array($row_shoe_price['shoe_price']);
                  $price_table=$row_shoe_price['shoe_price'];
                  $shoe_name=$row_shoe_price['shoe_name'];
                  $shoe_image1=$row_shoe_price['shoe_image1'];
                  $shoe_values=array_sum($shoe_price);
                  $total_price+=$shoe_values;
                ?>
                <tr>
                    <td><?php echo $shoe_name?></td>
                    <td><img src="./admin_area/product_images/<?php echo $shoe_image1?>" class="cart_img"alt=""></td>
                    <td><input type="text" name="qty" class="form-input w-50"></td>
                    
<!-- Code for update cart -->
                    <?php 
                    $get_ip_address = getIPAddress();  
                    if(isset($_POST['update_item'])){
                        $quantities=$_POST['qty'];
                        $update_cart="update `cart_details` set quantity=$quantities where ip_address='$get_ip_address'";
                        $result_shoe_quantity=mysqli_query($conn,$update_cart);
                        $total_price=$total_price*$quantities;
                    }?>

                    
                    <td><?php echo $price_table?></td>
                    <td><input type="checkbox" name="removeitem[]" value="<?php echo $shoe_id?>"></td>
                    <td>
                    <!--<button class="bg-primary text-light m-2 px-3 border-0">update</button>-->
                    <input type="submit" value="Update Item" class="bg-primary text-light m-2 px-3 border-0" name="update_item">
                    <input type="submit" value="Remove Item" class="bg-primary text-light m-2 px-3 border-0" name="remove_item">
                    </td>
             
                </tr>
                <?php }} ?>
            </tbody>
        </table>
        <div class="d-flex">
            <h4 class="px-3" style="font-size: 20px;">Total Amount: PHP <?php echo $total_price?></h4>
            <a href="shopnow.php"><button class="bg-secondary text-light m-2 px-3 border-0">Continue Shopping</button></a>
            <a href="#"><button class="bg-primary text-light m-2 px-3 border-0">Proceed to Checkout</button></a>
        </div>
    </div>
</div>
</form>