laravel transaction event test

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Database\Events\ConnectionEvent;
use Illuminate\Database\Events\TransactionBeginning;
use Illuminate\Database\Events\TransactionCommitted;
use Illuminate\Database\Events\TransactionRolledBack;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\ServiceProvider;

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

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Event::listen('eloquent.*', function ($event, $model) {
            preg_match('/^eloquent.(\w+)\:\s+([\w+\\\]+)$/ix', $event, $match);
            var_dump($match);
        });

        Event::listen(
            [TransactionBeginning::class, TransactionCommitted::class, TransactionRolledBack::class],
            function (ConnectionEvent $event) {
                var_dump(get_class($event));
            }
        );
    }
}