protected function getValidHostGroups($requestHost)
    {
        $validGroups = array();

        foreach ($this->httpHostGroups as $group => $hostnames) {
            if (in_array($requestHost, $hostnames)) {
                $validGroups[] = $group;
            }
        }

        return $validGroups;
    }
protected function getValidHostGroups($requestHost)
    {
        $validGroups = array();

        foreach ($this->httpHostGroups as $group => $hostnames) {
            if (in_array($requestHost, $hostnames)) {
                $validGroups[] = $group;
            }
        }

        return $validGroups;
    }
@param string $requestHost

@return array