public static function logErrorToFile($errors) {
        $errorMessage = self::_composeFullErrorMessage($errors);

        $stream = fopen(APPLICATION_PATH . '/data/logs/errors.log', 'a');
        $writer = new Zend_Log_Writer_Stream($stream);
        $logger = new Zend_Log($writer);
        $logger->log($errorMessage, Zend_Log::ALERT);
    }