CAS_Client::_removeParameterFromQueryString PHP Method

    private function _removeParameterFromQueryString($parameterName, $queryString)
    {
        $parameterName = preg_quote($parameterName);
        return preg_replace("/&{$parameterName}(=[^&]*)?|^{$parameterName}(=[^&]*)?&?/", '', $queryString);
    }