public static function getQueryString()
    {
        $querystringsDefault = explode('&', $_SERVER['QUERY_STRING']);
        $querystrings = array();

        foreach ($querystringsDefault as $querystring) {
            $querystring = explode('=', $querystring);
            $querystrings[$querystring[0]] = isset($querystring[1]) ? $querystring[1] : null;
        }

        return $querystrings;
    }