PSR 4 Class 使用错误

PSR 4 Class use error

这是我的代码:

use Ordering\Controllers\DefaultController as DefaultController;
use GuzzleHttp\Client;
namespace Ordering\Controllers;


class OrderController extends DefaultController
{

    public function placeOrder()
    {
        $client         = new GuzzleHttp\Client(['base_uri' => getenv('GOD')]);
        $response       = $client->request('POST', 'v1/order/placeorder');
        $this->data     = json_decode($response->getBody());
    }

}

我正在尝试导入 GuzzleHttp\Client 并在此 class 中使用它。 但问题是

我总是收到错误消息:

Class 'Ordering\Controllers\GuzzleHttp\Client' not found

有人知道如何更正吗?

添加\盈方

$client = new \GuzzleHttp\Client(['base_uri' => getenv('GOD')]);