Piwik\Plugins\SitesManager\API::getSiteSettings PHP Method

    public function getSiteSettings($idSite)
    {
        Piwik::checkUserHasAdminAccess($idSite);
        $measurableSettings = $this->settingsProvider->getAllMeasurableSettings($idSite, $idMeasurableType = false);
        return $this->settingsMetadata->formatSettings($measurableSettings);
    }