server:
class Server
{
    private $_serv = null;

    private $_e = null;

    public function __construct()
    {
        $this->_serv = new swoole_server("0.0.0.0", 9501);
        $this->_serv->set(array(
            'worker_num' => 8,
            'daemonize' => false,
            'max_request' => 10000,
            'dispatch_mode' => 2,
            'debug_mode'=> 1,
        ));

        $this->_serv->on('Start', array($this, 'onStart'));
        $this->_serv->on('WorkerStart', array($this, 'onWorkerStart'));
        $this->_serv->on('Connect', array($this, 'onConnect'));
        $this->_serv->on('Receive', array($this, 'onReceive'));
        $this->_serv->on('Close', array($this, 'onClose'));
        $this->_serv->start();
    }

    public function onStart($serv)
    {
        echo "start\n";
        cli_set_process_title('reload_master');
    }

    public function onWorkerStart($serv, $worker_id)
    {

        spl_autoload_register(function($class){

            $classPath = str_replace('\\', '/', $class) .'.php';
            if (file_exists($classPath)) {
                include $classPath;
            }

        });

        $this->_e = new \plugin\Event();

    }

    public function onConnect( $serv, $fd, $from_id ) {
        echo "Client {$fd} connect\n";

    }
    public function onReceive( swoole_server $serv, $fd, $from_id, $data ) {
        $serv->reload();//当接收到客户端消息时更新代码，下次再执行work代码时变（onWorkerStart），本次执行还是不变
        $this->_e->say();
        echo "Get Message From Client {$fd}:{$data}\n";
    }
    public function onClose( $serv, $fd, $from_id ) {
        echo "Client {$fd} close connection\n";
    }

}

new Server();

client:

$cli = new Swoole_client(SWOOLE_SOCK_TCP);

$cli->connect('127.0.0.1', 9501, 1);

fwrite(STDOUT, '输入消息：');
$msg = trim(fgets(STDIN));

$cli->send($msg);

swoole reload 代码热更新 example_reload