以下是修改 Laravel 应用程序的端口配置，
修改环境变量 APP_URL 来实现

app/Providers/AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Events\Dispatcher;
use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\URL;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot(Dispatcher $events)
    {  
        //强制修改Laravel根地址
        URL::forceRootUrl(env('APP_URL'));
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {

    }
}

.env

APP_URL=http://123.123.123.123:90/

配置可能不会生效，需要重启一下php