project/app/Events/WorkerStartEvent.php

<?php

namespace App\Events;

use Cache;
use DB;
use Hhxsv5\LaravelS\Swoole\Events\WorkerStartInterface;
use Swoole\Http\Server;

class WorkerStartEvent implements WorkerStartInterface
{

    public function __construct()
    {
    }

    public function handle(Server $server, $workerId)
    {
        if (isset($server->startMsecTime) && Cache::get("swooleServerStartMsecTime") != $server->startMsecTime) {
            Cache::forever("swooleServerStartMsecTime", $server->startMsecTime);
            DB::table('ws')->delete();
        }
    }
}