一、下载 laravel 5.4

composer create-project laravel/laravel=5.4.* laravel5.4_facades

切换目录

cd laravel5.4_facades

二、facades

启动服务

php artisan serve

新建 app/Services/Weibo.php

namespace App\Services;

class Weibo
{
    protected $http;

    public function __construct(Http $http)
    {
        $this->http = $http;
    }

    public function publish($status)
    {
        $this->http->post($status);
    }
}

新建 app/Services/Http.php

namespace App\Services;

class Http
{
    public function post($status)
    {
        dd('I posted as status :'. $status);
    }
}

修改 routes/web.php

use Facades\App\Services\Weibo;

Route::get('/', function () {
    Weibo::publish('这是一条微博');
});

访问：http://127.0.0.1:8000/