Laravel Tinker

为了继续使用tinker Artisan命令，您还应该安装laravel/tinker软件包:

In order to continue using the tinker Artisan command, you should also install the laravel/tinker package:

composer require laravel/tinker

一旦安装了软件包，您应该将Laravel\Tinker\TinkerServiceProvider::class添加到config/app.php配置文件中的providers数组中.

Once the package has been installed, you should add Laravel\Tinker\TinkerServiceProvider::class to the providers array in your config/app.php configuration file.

来源: https://laravel.com/docs/5.4/upgrade