Php 在Laravel中从动态嵌套数组中获取值

我想从该数组中获取所有值:

<root>
   <Element1>
       <items>
            <Element0>
                 <sku>AAAA</sku>
             </Element0>
             <Element1>
                 <sku>BBBB</sku>
             </Element1>
        </items>
   </Element1>
        <items>
              <Element0>
                  <sku>ABAB</sku>
               </Element0>
        </items>
   <Element2>
   </Element2>
...
...
</root>

数组来自Magento2 Orders API，所以它是动态的，我实现了所有，但我不能从嵌套数组中获取sku.

这就是我想要做的:

$phpDataArray = json_decode($xml, true);

    if (count($phpDataArray['items']) > 0) {
      $sku = array();
      $dataArray = array();
      foreach ($phpDataArray['items'] as $index => $data) {

        $status = $data['status'];
        $customername = $data['customer_firstname'];
        $customersurname = $data['customer_lastname'];
        $email = $data['customer_email'];
        $increment_id = $data['increment_id'];
        $orderdata = $data['created_at'];
        $total = $data['grand_total'];
        foreach ($data['items'] as $item) {
          $sku= $item['sku'];
        }
        $dataArray[] = [
          "increment_id" => $increment_id,
          "status" => $status,
          "product_sku" => $sku,
          "customername" => $customername,
          "customersurname" => $customersurname,
          "email" => $email,
          "order_date" => $orderdata,
          "total" => $total
        ];
      }
    }

但只显示了最后一个SKU. 示例:在元素1中，我只有BBBB，但我想要AAAA；BBBB