Routes Versioning

<?php

namespace App\Providers;

use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Routing\Router;

class RouteServiceProvider extends ServiceProvider
{

    /**
     * This namespace is applied to the controller routes in your routes file.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $apiV1Namespace = 'App\Http\Controllers\v1';
    protected $apiV2Namespace = 'App\Http\Controllers\v2';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @param  \Illuminate\Routing\Router $router
     *
     * @return void
     */
    public function boot(Router $router)
    {
        //

        parent::boot($router);
    }

    /**
     * Define the routes for the application.
     *
     * @param  \Illuminate\Routing\Router $router
     *
     * @return void
     */
    public function map(Router $router)
    {

        /*
        |--------------------------------------------------------------------------
        | v1 API Router 
        |--------------------------------------------------------------------------
        */

        $router->group(['namespace' => $this->apiV1Namespace], function ($router) {
            require app_path('Http/routes.v1.php');
        });

        /*
        |--------------------------------------------------------------------------
        | v2 Api Router 
        |--------------------------------------------------------------------------
        */

        $router->group(['namespace' => $this->apiV2Namespace], function ($router) {
            require app_path('Http/routes.v2.php');
        });

    }
}