i have added some thing like this its work fine but the double quote "" is showing why ?
$cart = Session::get('cart');
$cart->discount = $first_value;
Session::put('cart', $cart);
it works fine adding the key and value but key in double quote why
+totalQty: 3
+shippingCost: 4
+totalPrice: 60.0
+subTotal: 64.0
+"discount": 8
}