Piwik\Plugins\UsersManager\API::getDefaultUserPreference PHP Method

    private function getDefaultUserPreference($preferenceName, $login)
    {
        switch ($preferenceName) {
            case self::PREFERENCE_DEFAULT_REPORT:
                $viewableSiteIds = \Piwik\Plugins\SitesManager\API::getInstance()->getSitesIdWithAtLeastViewAccess($login);
                if (!empty($viewableSiteIds)) {
                    return reset($viewableSiteIds);
                }
                return false;
            case self::PREFERENCE_DEFAULT_REPORT_DATE:
                return Config::getInstance()->General['default_day'];
            default:
                return false;
        }
    }