This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Developer Loggers for Simple History


Bring more loggers to WordPress user history plugin Simple History.
That are useful for developers during development of a site or to maintain a live site.

Included loggers and plugins

Post to Slack

All your events is posted to a Slack channel of your choice, using an incoming webhook. Yes, with this plugin enabled
there is no need what so ever to ever leave Slack to see what’s happening on your site or the site of your
clients or… well, on any site where you have Simple Histor and this plugin enabled.


See all mails sent with wp_mail(), no matter what the recipient address is.

404 logger

View page visits that load the 404 template.

JavaScript error logger

See what JavaScript errors users that visit your site is getting.

SystemLog logger

Log all messages from Simple History to the syslog on the server. With this logger enabled there is no need to use the beautiful GUI of Simple History ;).

HTTP API logger

Log all usage of HTTP calls from functions like wp_remote_post() and wp_remote_get().

You can the URL requested, the arguments posted and the full returned result, including server headers.

The time for the request to complete is also logged. Great for debugging!


  • Enable the loggers you want in Settings » Simple History » Developer loggers.

  • Example output of the WordPress Cron debug logger.

  • Example output of the WPMail logger. You can see the subject, who the mail is sent to, and the contents of the body.

  • Example output form the HTTP API logger. View method and target URL.

  • Details from the HTTP API logger. Even more details here, like all the headers in the response and also the full response.

  • Example output from the WordPress post to Slack Logger. Here you can see me failing to login, then succeeding to login, updating a plugin, and finally I log out.


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Contributors & Developers

“Developer Loggers for Simple History” is open source software. The following people have contributed to this plugin.



0.5 (November 2016)

  • Add notice in admin that Simple History must be installed and activated to use this plugin.
  • Add some very basic Travis CI tests, so the plugin is less likely to cause any obvious errors.
  • The Available Updates Logger has now moved to the main Simple History plugin, because it’s useful for most users and not only admins.
  • Added filter simple_history/developer_loggers/enabled_loggers to modify what plugins are enabled.
  • Added filter simple_history/developer_loggers/slackit/settings to modify the settings of the Slackit logger.
  • Added examples.php with some examples of filter usage.

0.4.1 (August 2016)

  • Check that the sys_getloadavg() exists before trying to use. Could cause error on Windows.

0.4 (August 2016)

  • Logger for Limit Logins Attempts has moved to Simple History, so more users can benefit from it.
  • When a plugin update is found: use the english name for the plugin, instead of the translated name.

0.3.4 (June 2016)

  • Bump up requirement to 5.4 because I’m to tired to write code for 5.3

0.3.3 (June 2016)

  • Fixed notice warning in post to Slack
  • Add error message if not running PHP 5.3 or higher
  • Change unit in HTTP API message from milliseconds to seconds

0.3.2 (May 2016)

  • Added: Logger HTTP API Logger that logs all GET and POST requests made using for example wp_remote_get() and wp_remote_post().
  • Fixed: The logger for available updates could throw a fatal error on the plugin install screen. Hopefully fixed now, and if
    then it fixes (the very first issue for this plugin! 🎉).

0.3.1 (March 2016)

  • Fixed: Function __return_empty_string is not called _return_empty_string
  • Fixed: Undefined notice for $initiator_text in the post to Slack plugin

0.3 (February 2016)

  • Added: New plugin: Slack! Yes, now all your logged events can be posted to a Slack channel of your choice.
  • Added: Actions simple_history/developer_loggers/before_plugins_table and simple_history/developer_loggers/before_plugins_table.

0.2 (December 2015)

  • Changes to Limit Login Attempts.

0.1 (December 2015)

  • First public version. Enjoy!