大佬帮看看mqtt的实例报错吧

 public function onWorkerStart()
    {
        var_dump(getenv('MQTT_HOST') . ':' . getenv('MQTT_PORT'));
        var_dump(getenv('MQTT_USER') . ':' . getenv('MQTT_PASSWORD'));
        $mqtt = new Client(getenv('MQTT_HOST') . ':' . getenv('MQTT_PORT'), [
            'username' => getenv('MQTT_USER'),
            'password' => getenv('MQTT_PASSWORD'),
        ]);
    }

Fatal error: Declaration of Workerman\Mqtt\Protocols\Mqtt::input(string $buffer, Workerman\Connection\ConnectionInterface $connection): int must be compatible with Workerman\Protocols\ProtocolInterface::input($recv_buffer, Workerman\Connection\ConnectionInterface $connection) in /Users/zhengjiefeng/yujianshanhai/api-device-dept/vendor/workerman/mqtt/src/Protocols/Mqtt.php on line 134