shardId

 $accessToken = $_SESSION['accessToken'];
            $client= new Client(array(
                'token' => $accessToken,
                'sandbox' => SANDBOX
            ));
            $userStore = $client->getUserStore();
            $usuario = $userStore->getUser();
            if (!empty($usuario)) {
                $result = $usuario -> shardId;
            }
            $_SESSION['userShardId'] = $result;