App\Providers\AppServiceProvider::boot PHP Method

    public function boot()
    {
        // Add some custom validation rules
        Validator::extend('path.valid', function ($attribute, $value, $parameters, $validator) {
            return is_dir($value) && is_readable($value);
        });
    }

 /**
  * Define your route model bindings, pattern filters, etc.
  *
  * @param  \Illuminate\Routing\Router  $router
  * @return void
  */
 public function boot(Router $router)
 {
     // auth()->loginUsingId(1);
     parent::boot($router);
 }