我得到下面的对象，该对象从获取Stripe会话ID的过程中返回（该对象称为$order）。

我可以使用第一个对象级别打印值print_r($order->id);

如何打印第二级的值，例如金额或货币？
我尝试了print_r($order->display_items->amount);和print_r($order->display_items['amount']);

PHP：

Stripe\Checkout\Session JSON: { 
    "id": "some_id","object": "checkout.session","billing_address_collection": null,"cancel_url": "some_url","client_reference_id": null,"customer": "some_id","customer_email": null,"display_items": [{
        "amount": 2990,// this is what I need
        "currency": "eur",// this is what I need
        "custom": {
            "description": null,"images": null,"name": "some_product"
        },"quantity": 1,"type": "custom"
    }],"livemode": false,"locale": "en","mode": "payment","payment_intent": "some_id","payment_method_types": [ "card" ],"setup_intent": null,"submit_type": null,"subscription": null,"success_url": "some_url"
}

更新： 如果我使用print_r($order->display_items);，则会得到以下信息。我可以将其分配给数组，然后从那里打印（如果没有其他解决方案）？

Array ( [0] => Stripe\StripeObject Object ( [amount] => 2990 [currency] => eur [custom] => Stripe\StripeObject Object ( [description] => [images] => [name] => some_product ) [quantity] => 1 [type] => custom ) )

非常感谢。