使用php获取此数组中的值时遇到问题

我想获得每个数组集的订单号。但我似乎无法做到这一点。 当我可以获得此阵列的样本部分时：

Array Dump:
<?php
$data =
array (
  0 => 
  stdClass::__set_state(array(
     'orderId' => 577633674,
     'orderNumber' => '2939',
     'orderKey' => '2939',
     'orderDate' => '2020-07-28T00:00:00.0000000',
     'createDate' => '2020-07-28T10:58:35.3600000',
     'modifyDate' => '2020-10-20T06:39:30.0070000',
     'paymentDate' => '2020-07-28T10:58:34.0000000',
     'shipByDate' => NULL,
     'orderStatus' => 'awaiting_shipment',
     'customerId' => 309926130,
     'customerUsername' => 'REMOVED',
     'customerEmail' => 'REMOVED',
     'billTo' => 
    stdClass::__set_state(array(
       'name' => 'REMOVED',
       'company' => '',
       'street1' => 'REMOVED, ',
       'street2' => 'REMOVED',
       'street3' => '',
       'city' => 'Austin',
       'state' => 'TX',
       'postalCode' => 'REMOVED',
       'country' => '  ',
       'phone' => 'REMOVED',
       'residential' => NULL,
       'addressVerified' => NULL,
    )),

阵列转储：
$data[0]->订单号
就这样！泰！