bill-api/app/Providers/AppServiceProvider.php

<?php

/*
 * This file is part of the Jiannei/lumen-api-starter.
 *
 * (c) Jiannei <longjian.huang@foxmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace App\Providers;

use Carbon\Carbon;
use Illuminate\Support\Facades\App;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register()
    {
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        if (App::getLocale() == 'zh_CN') {

            Carbon::setLocale('zh');
        }

        $this->registerObservers(); // 注册观察者
    }

    protected function registerObservers(): void
    {
    }
}