class Server

{

    const PORT = 8888;

    public function port()

    {

        //netstat -anp 2>/dev/null| grep 8888 |grep LISTEN |wc -l

        $shellCommand = 'netstat -anp 2>/dev/null| grep ' . self::PORT . "| grep LISTEN | wc -l";

        $result = shell_exec($shellCommand);

        if ($result != 1) {

            //进程不存在，发送警报信息

            echo 'At '.date('Y-m-d H:i:s') . ' service process is exit' . PHP_EOL;

        } else {

            echo 'At '.date('Y-m-d H:i:s') . ' service process is ok' . PHP_EOL;

        }

    }

}

Swoole\Timer::tick(1000, function (int $timer_id) {

    (new Server)->port();

});