Php 接口不绑定到实现

我正在构建一个Lumen应用程序。我正在尝试为我的存储库使用接口。我所有的逻辑都封装在一个composer包中

以下是我的供应商/package/src/app/Providers/PackageServiceProvider.php：

<?php

namespace Vendor\Package\App\Providers;

use Illuminate\Support\ServiceProvider;

class SmsBackendCoreServiceProvider extends ServiceProvider
{
    protected $defer = false;

    public function register()
    {
        $this->app->bind(
            'Vendor\Package\App\Repositories\Contracts\SmsService',
            'Vendor\Package\App\Repositories\Services\SmsJson'
        );
    }

    public function boot()
    {
        $this->app->group(
            ['namespace' => 'Vendor\Package\App\Http\Controllers'],
            function ($app) {
                require __DIR__.'/../../routes/web.php';
            }
        );
    }
}

---

你的合同被声明为一个类，它必须是一个接口。
蒂亚戈你是一个救生员。我刚刚花了4个小时来讨论这个问题。万分感谢！
<?php

$app->get('/sms/send.json', 'JsonController@send');

<?php

namespace Vendor\Package\App\Http\Controllers;

use Vendor\Package\App\Http\Controllers\BaseController;
use Vendor\Package\App\Repositories\Contracts\SmsService;

class JsonController extends BaseController
{
    public $service;

    public function __construct(SmsService $service)
    {
        $this->service = $service;
    }

    public function send()
    {
        $response = $this->service->sendSms(1, 2, 3);

        return $response;
    }
}

<?php

namespace Vendor\Package\App\Repositories\Contracts;

class SmsService
{
    public function sendSMS($from, $to, $text);
}

<?php

namespace Vendor\Package\App\Repositories\Services;

use Vendor\Package\App\Repositories\Contracts\SmsService;

class SmsJson implements SmsService
{
    public function sendSMS($from, $to, $text)
    {
        echo 'success';
    }
}