Piwik\Plugin\ViewDataTable::getNonOverridableParams PHP Method

    public function getNonOverridableParams($overrideParams)
    {
        $paramsCannotBeOverridden = array();
        foreach ($overrideParams as $paramName => $paramValue) {
            if (property_exists($this->requestConfig, $paramName)) {
                $allowedParams = $this->requestConfig->overridableProperties;
            } elseif (property_exists($this->config, $paramName)) {
                $allowedParams = $this->config->overridableProperties;
            } else {
                // setting Config.custom_parameters is always allowed
                continue;
            }
            if (!in_array($paramName, $allowedParams)) {
                $paramsCannotBeOverridden[] = $paramName;
            }
        }
        return $paramsCannotBeOverridden;
    }