PHP `print_r()` 출력 내 중첩된 값에 프로그래밍 방식으로 액세스하려면 어떻게 해야 합니까?

field_image (Object) stdClass
  handler (Object) views_handler_field_field
    view (Object) view
      result (Array, 2 elements)
        0 (Object) stdClass
          _field_data (Array, 1 element)
            nid (Array, 2 elements)
              entity (Object) stdClass
                field_image (Array, 1 element)
                  und (Array, 1 element)
                    0 (Array, 11 elements)
                      filename (String, 23 characters ) FILENAME.jpg

$field_image->handler->view->result[0]->_field_data['nid']['entity']->field_image['und'][0]['filename']