Gajus\Fuss\SignedRequest::getAppData PHP Method

    public function getAppData()
    {
        $app_data = isset($this->signed_request['app_data']) ? $this->signed_request['app_data'] : null;
        if (is_string($app_data)) {
            $data = json_decode($app_data, true);
            if (json_last_error() == JSON_ERROR_NONE) {
                $app_data = $data;
            }
        }
        return $app_data;
    }