我正在嘗試從 Steam 服務獲取我的項目列表。我有兩個功能，其中1個：從Steam商店接收所有物品，2個函數接收物品的價格，名稱，圖片。因此，當我嘗試解析數據時，在我的一個帳戶中，我收到一個錯誤：，而在我的第二個帳戶中，所有解析都很好。Undefined property: stdClass::$Unblinking Eternityvar_dump($items); exit;給我看：object(stdClass)#547 (34183) { ["Orb of Deliverance"]=> object(stdClass)#546 (2) { ["price"]=> float(58.31) ["appid"]=> string(3) "570" } ["Planks of the Bogatyr"]=> object(stdClass)#54.......和一些日志：at HandleExceptions->handleError('8', 'Undefined property: stdClass::$Unblinking Eternity', '/var/app/Http/Controllers/InventoryController.php', '320', array('market_hash_name' => 'Unblinking Eternity', 'json' => '{"Orb of Deliverance":{"price":57.780000000000001,"appid":"570","count":427,"bprice":51.490000000000002,"bcount":11663},"Planks of the Bogatyr":{"price":0.14000000000000001,"appid":"570","count":922,"bprice":0.12,"bcount":859},"Headdress of the Ember Crane":{"price":0.16,"appid":"570","count":808,"bprice":0.14999999999999999,"bcount":218},"Sash of Divine Ascension":錯誤顯示在320行，320行它：if($items->$item_name == 'undefined'){我的2個功能：public static function getItemPrice($market_hash_name) {    try {        if(\Cache::has('prices')){            $json = \Cache::get('prices');            $items = json_decode($json);            $item_name = $market_hash_name;            if($items->$item_name == 'undefined'){                return false;            } else{                return $items->$item_name->price;            }        } else {            return false;        }    } catch(Exception $e){        return false;    }}我如何理解，一個問題。stdClass我的錯誤在哪里？我該如何修復此錯誤？