print_r($_COOKIE);
if(isset($_POST["addcart"])){    if(isset($_COOKIE["shopping_cart"])){        $cookie_data = stripslashes($_COOKIE['shopping_cart']);
        $cart_data = json_decode($cookie_data, true);
    }else{
        $cart_data = array();
    }
    $item_id_list = array_column($cart_data, 'item_id');
    if(in_array($_POST["id"], $item_id_list)){
        foreach($cart_data as $keys => $values){            if($cart_data[$keys]["item_id"] == $_POST["id"]){                $cart_data[$keys]["item_quantity"] = $cart_data[$keys]["item_quantity"] + $_POST["quantity"];            }        }
    }else{
        $item_array = array(            'item_id'            =>    $_POST["id"],            'item_name'            =>    $_POST["title"],            'item_image'        =>    $_POST["image"],            'item_price'        =>    $_POST["price"],            'item_quantity'        =>    $_POST["quantity"]        );                $cart_data[] = $item_array;
    }
        $item_data = json_encode($cart_data);    setcookie('shopping_cart', $item_data, time() + (86400 * 30), '/');    header("Location:?addcart=do");}

cookie sepet işlemleri yapıyorum ancak şöylebir sorun var utf 8 sorunu var json encode ederken nasıl utf 8 ekleyebilirim?