更新基于PHP会话的购物车中的数量

Question

Hello and a happy new year to everyone! I work with php sessions...I have a cart...I want to update the quantity via session... Here is my update action within the main file

if(isset($_POST["update"]))
    { 
        if ($_SESSION["item_id"] = $_GET["id"])
             { 
          $_SESSION['quantity'] = $_POST['quantity'];
             }
    }

And here is the form within the foreach loop to display the checked product

  $total = 0;
     foreach ($_SESSION['cart'] as $item) {
    ?>
    <tr>
    <td><?php echo $item['name']; ?></td>
    <td>
    <form method="post" action="index2.php?action=update&id=<?php echo 
     $item["item_id"]; ?>">

     <input type="text" name="quantity" value="1" class="form-control" />
    <input type="submit" name="update" style="margin-top:5px;" class="btn btn-success" value="update" />
              </form>
<?php   echo  $_SESSION['quantity'];  //here I try to dislpay the new quantity that the user sets
 echo $item["item_id"]; ?></td>

Problem

It changes the quantity in all the products within the basket and not in the specific one I want.

Please forgive me because I am a new bye.

Answer 1

I added one more dimension to the $_SESSION array, using the item ID:

$_SESSION['item'][$_GET['id']]['quantity'] = $_POST['quantity'];

Then when updating the quantity in the form:

echo $_SESSION['item'][$item['item_id']]['quantity'];