如何从 API 结果中选择特定值

Question

我的网站显示来自第三方服务的所有 Dota 2 项目的价格。

当像这样解析事物列表时，我得到了答案：

"The Lightning Orchid": {
    "name": "The Lightning Orchid",
    "price": {
        "24_hours": {
            "average": 106.5,
            "median": 106.5,
            "sold": "92",
            "standard_deviation": "3.29",
            "lowest_price": 98.8,
            "highest_price": 115.61
        },
        "7_days": {
            "average": 106.5,
            "median": 107.2,
            "sold": "764",
            "standard_deviation": "3.29",
            "lowest_price": 95.29,
            "highest_price": 115.61
        },
        "opskins_average": 81.28
    },
    "first_sale_date": "1401573600"
},

我更新所有价格的代码是：

const STEAMP = 'http://dota2.csgobackpack.net/api/GetItemsList/v2/?currency=RUB&no_details=true&details=false';
public static function updatePrices()
{
    if ($data = json_decode(file_get_contents(self::STEAMP)) ?? false) {
        if ($data->success) {
            Storage::disk('local')->put(self::Prices, json_encode([
                'time' => time(),
                'items' => $data->items_list,
            ]));
            return $data->items_list;
        } else {
            \Log::error('Error: ' . $data->message);
            return false;
        }
    } else {
        \Log::error('Error updating prices!');
        return false;
    }
}

如何在24小时内获得最低价格？ 我尝试添加'lowest_price' => $data->lowest_price,但我开始收到错误Undefined property: stdClass::$lowest_price