protected static function convertToLowercase($str)
    {
        $explodedStr = explode('_', $str);

        if (count($explodedStr) > 1) {
            $lowerCasedStr = [];
            foreach ($explodedStr as $value) {
                $lowerCasedStr[] = strtolower($value);
            }
            $str = implode('_', $lowerCasedStr);
        }

        return $str;
    }