code: public function export()
      {
          openlog($this->identity, $this->options, $this->facility);
          foreach ($this->messages as $message) {
              if (syslog($this->_syslogLevels[$message[1]], $this->formatMessage($message)) === false) {
                  throw new LogRuntimeException('Unable to export log through system log!');
              }
          }
          closelog();
      }
docs: Writes log messages to syslog.
  Starting from version 2.0.14, this method throws LogRuntimeException in case the log can not be exported.
  @throws LogRuntimeException