John Blackbourn – @johnbillion

Member Since: December 7th, 2005
Location: Tonbridge, UK; and Torino, Italy
Website: johnblackbourn.com
GitHub: johnbillion
Job Title: Senior WordPress Engineer
Employer: Human Made Ltd
Find me on:

Bio

I’m one of the team of WordPress core developers. I was the release lead for WordPress 4.1 and 4.9.1. I work as an engineer at Human Made.

Previously I’ve worked at Code For The People and WordPress.com VIP.

Contributions Sponsored

John Blackbourn contributes 8 hours per week to the following teams: CLI, Core, Documentation.

Contribution History

Accessibility Contributor
bbPress Contributor
BuddyPress Contributor
Core Contributor
Core Team
Documentation Contributor
Meetup Organizer
Meta Contributor
Plugin Developer
Translation Contributor
WordCamp Organizer
WordCamp Speaker

Activity
Plugins
Favorites
Translations

Posted a reply to Add to Cart Not Always Working, on the site WordPress.org Forums:
Are you using at least WooCommerce version 3.6? Prior to that it wasn't possible for…

2 mins ago
Posted a reply to WP Core issue?, on the site WordPress.org Forums:
This most likely means you have a very large number of rows in the options…

14 hours ago
Posted a reply to Cron job doesnt run and duplicate job is created, on the site WordPress.org Forums:
Are your other cron events running properly? This is a sign that your cron runner…

4 days ago
Created a new ticket, #50618, in Core Trac:
Introduce the ability to restore a trashed post as a draft

4 days ago
Closed ticket #50614, in Core Trac:
About the defects that i found

5 days ago
Posted a reply to Installed WP control but booking reminder notification in MEC doesn’t work, on the site WordPress.org Forums:
Sorry you're having a problem with your site, but this isn't anything specific to WP…

6 days ago
Posted a reply to Invalid (empty) cron events, on the site WordPress.org Forums:
Thanks for the update. I think this sort of broken list of cron events is…

1 week ago
Posted a reply to Invalid (empty) cron events, on the site WordPress.org Forums:
If you're happy to send me a copy of the contents of your cron option…

1 week ago
Posted a reply to Invalid (empty) cron events, on the site WordPress.org Forums:
I've not seen these personally. Does this mean that in the database you have an…

1 week ago
Posted a reply to Query Monitor not showing on frontend, on the site WordPress.org Forums:
Potentially yes. The best approach is to export your production database to staging and test…

2 weeks ago
Posted a reply to Query Monitor not showing on frontend, on the site WordPress.org Forums:
Sorry to hear that. Did you try the suggestions in that other thread? I know…

2 weeks ago
Created a new ticket, #50531, in Core Trac:
Standardise the terminology used for hooks, actions, and filters in ...

2 weeks ago
Posted a reply to PHP Errors in Ajax Response, on the site WordPress.org Forums:
This is the placeholder JavaScript that QM uses to display information about errors in Ajax,…

2 weeks ago
Closed ticket #50058, in Core Trac:
Improve the local development environment docs

2 weeks ago
Committed [48192] to Core Trac:
Docs: Improvements to the inline docs for metadata related functions. ...

2 weeks ago
Created a new ticket, #50489, in Core Trac:
Improve the "Auto-update update" text

2 weeks ago
Created a new ticket, #50484, in Core Trac:
Incorrect HelpHub URL for getting started

2 weeks ago
Committed [48184] to Core Trac:
Docs: Miscellaneous docblock improvements. See #49572.

2 weeks ago
Closed ticket #50468, in Core Trac:
WordPress Amazon Embed code is adding affiliate tracking code when any ...

2 weeks ago
Posted a reply to Query monitor causes fatal PHP error with no indication why, on the site WordPress.org Forums:
Ah-ha! This might actually be a bug in QM. If a fatal error occurs before…

2 weeks ago
Posted a reply to Query monitor causes fatal PHP error with no indication why, on the site WordPress.org Forums:
Alright cheers, I'll do some testing and see if I can persuade that stack trace…

2 weeks ago
Posted a reply to Query monitor causes fatal PHP error with no indication why, on the site WordPress.org Forums:
I don't think it would help, to be honest. I'll do some testing locally to…

2 weeks ago
Posted a reply to Query monitor causes fatal PHP error with no indication why, on the site WordPress.org Forums:
Unfortunately due to PHP's funky handling of errors there are some situations where you might…

2 weeks ago
Posted a reply to How to create this cron event?, on the site WordPress.org Forums:
You can create this by adding a PHP Cron event with WP Crontrol. Details are…

3 weeks ago
Committed [2328560] to Plugins Trac:
Update to version 1.5.5 from GitHub

3 weeks ago
Posted a reply to Essential plugin for a developer, on the site WordPress.org Forums:
Thank's for the review. I think I'll make that the new tagline for Query Monitor…

3 weeks ago
Created a new ticket, #50437, in Core Trac:
Add leniency to the overdue check for plugin and theme auto updates

3 weeks ago
Posted a reply to Updated to version 1.8.5 breaks all Cron jobs, on the site WordPress.org Forums:
@williamvanwyk Unfortunately that wp-geo-website-protection plugin that you were using contains what appears to be malware…

3 weeks ago
Posted a reply to Wp_options folder, on the site WordPress.org Forums:
This plugin doesn't use any settings.

3 weeks ago
Posted a reply to InnoDB or MyISAM, on the site WordPress.org Forums:
I think you have the wrong forum.

3 weeks ago
Posted a reply to Wordfence conflict, on the site WordPress.org Forums:
There are some ways to prevent QM from logging its data but it needs to…

4 weeks ago
Posted a reply to Wordfence conflict, on the site WordPress.org Forums:
This isn't so much a conflict as it is a general issue with debugging plugins…

4 weeks ago
Wrote a comment on the post Dev Chat Agenda for June 17th, 2020, on the site Make WordPress Core:
There's been some renewed interest and movement on adding the ability for users to change…

4 weeks ago
Posted a reply to query monitor and socket connection, on the site WordPress.org Forums:
The availability of the hit and miss counts is dependent on the cache driver providing…

4 weeks ago
Posted a reply to sslverify=false, on the site WordPress.org Forums:
Sorry to hear this but I'm unable to provide support for individual sites. It would…

4 weeks ago
Posted a reply to Updated to version 1.8.5 breaks all Cron jobs, on the site WordPress.org Forums:
Yeah your best bet in this case is to deactivate your other plugins one by…

4 weeks ago
Posted a reply to Cron Each 2 Days, on the site WordPress.org Forums:
You'll need to add a schedule with an interval of two days, if one doesn't…

4 weeks ago
Posted a reply to 403 when switching user by Administrator, on the site WordPress.org Forums:
* Are you using any plugins which change the way that authentication or logging in…

4 weeks ago
Posted a reply to Can We Modify Other Users’ Dashboard?, on the site WordPress.org Forums:
Yep. Settings for features built into WordPress such as screen options, dashboard widgets, etc are…

4 weeks ago
Posted a reply to Cron Job not run until the page open, on the site WordPress.org Forums:
If there's no traffic to your website then your events will miss their schedule. More…

4 weeks ago
Posted a reply to Cron Job not run until the page open, on the site WordPress.org Forums:
This thread is a duplicate of https://wordpress.org/support/topic/cron-job-not-run-until-the-page-open/.

4 weeks ago
Posted a reply to Cron Job not run until the page open, on the site WordPress.org Forums:
Is WP Crontrol showing you any warning messages?

4 weeks ago
Posted a reply to External object cache not in use – Now what?, on the site WordPress.org Forums:
I'm sorry this isn't as clear as it could be, I'm planning on improving the…

4 weeks ago
Posted a reply to DOMException, on the site WordPress.org Forums:
Can you provide some more info please? Where are you seeing this error? Does it…

1 month ago
Posted a reply to Error with php 7.4 (Trying to access array offset on value of type bool), on the site WordPress.org Forums:
Thanks. Is this in a Docker container? Or another environment where the uid of the…

1 month ago
Posted a reply to Cron events with no actions, on the site WordPress.org Forums:
Most likely these are safe to delete. You can usually Google a cron event name…

1 month ago
Posted a reply to Zodiacpress plugin activated but not working, on the site WordPress.org Forums:
This is the wrong forum. Try here: https://wordpress.org/support/plugin/zodiacpress/

1 month ago
Posted a reply to Switching to other users in my multisite hasn’t been working for months…, on the site WordPress.org Forums:
Most plugins which change the login URL will break something somewhere, because this isn't fully…

1 month ago
Posted a reply to Switching to other users in my multisite hasn’t been working for months…, on the site WordPress.org Forums:
Also caching plugins can sometimes interfere if they're configured a bit too aggressively. Try deactivating…

1 month ago
Posted a reply to Switching to other users in my multisite hasn’t been working for months…, on the site WordPress.org Forums:
Sorry you're having trouble. * Are you using any plugins which change the way that…

1 month ago