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
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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

Closed ticket #50952, in Core Trac:
WordPress 5.5 has broken tabs in WooCommerce products

16 hours ago
Closed ticket #50914, in Core Trac:
Video Playlists broken

16 hours ago
Closed ticket #50935, in Core Trac:
Images coming up blank after 5.5 update

18 hours ago
Posted a reply to cron job fails to run, on the site WordPress.org Forums:
Very sorry to hear this @esp2013 but you'll need to post this in the main…

22 hours ago
Closed ticket #50928, in Core Trac:
wordpress 5.5 errors

24 hours ago
Closed ticket #50929, in Core Trac:
WP 5.5

24 hours ago
Posted a reply to Does Query Monitor impact standard users?, on the site WordPress.org Forums:
QM still collects data for non logged in users (because a fair amount of data…

1 day ago
Created a new ticket, #50903, in Core Trac:
Set the local environment to a development environment type by default

2 days ago
Committed [2357528] to Plugins Trac:
Updating readme/assets from GitHub

2 days ago
Wrote a comment on the post New wp_get_environment_type() function in WordPress 5.5, on the site Make WordPress Core:
Can you open a ticket on Core Trac for this please Caleb?

2 days ago
Created a new ticket, #50891, in Core Trac:
Updated docs for default metadata values

3 days ago
Created a new ticket, #50880, in Core Trac:
Allow wpmu_create_user to return a WP_Error

3 days ago
Closed ticket #50869, in Core Trac:
Vimeo oEmbed now has dnt=1 parameter, and causes numerous videos to be ...

6 days ago
Wrote a comment on the post E2E (End-To-End) Testing in Core Proposal, on the site Make WordPress Core:
I fully support this.

6 days ago
Created a new ticket, #50868, in Core Trac:
Correct usage of the non-dynamic auto_update_plugin and ...

7 days ago
Posted a reply to Output appearing on logout screen, on the site WordPress.org Forums:
Your users won't see this message by the way, it's only shown to users who…

1 week ago
Posted a reply to Output appearing on logout screen, on the site WordPress.org Forums:
Thanks for the report. What's the error message above this message?

1 week ago
Posted a reply to One PHP Notice left after last update, on the site WordPress.org Forums:
Thanks. What environment is this on please?

3 weeks ago
Posted a reply to How to see non-logged in data?, on the site WordPress.org Forums:
This functionality sets a cookie in your browser which allows you to then log out…

3 weeks ago
Committed [2346444] to Plugins Trac:
Update to version 3.6.1 from GitHub

3 weeks ago
Posted a reply to Deny switch_users capability, on the site WordPress.org Forums:
I'm not familiar with the User Role Editor plugin, but in the Members plugin for…

3 weeks ago
Posted a reply to incompatibility with latest woocommerce update, on the site WordPress.org Forums:
Sorry to say this but this looks very much like your site has been hacked.…

3 weeks ago
Posted a reply to incompatibility with latest woocommerce update, on the site WordPress.org Forums:
What's the error?

3 weeks ago
Posted a reply to Does this plugin work with real cron?, on the site WordPress.org Forums:
If the events are missing their schedules then they aren't running, regardless of how they're…

3 weeks ago
Posted a reply to Automatic static page export, on the site WordPress.org Forums:
I'm sorry but I can't help you with this. You'll need to speak with WP2static.

3 weeks ago
Posted a reply to Does this plugin work with real cron?, on the site WordPress.org Forums:
Okay so those errors are telling you that the events have missed their schedule (eg…

3 weeks ago
Posted a reply to Does this plugin work with real cron?, on the site WordPress.org Forums:
This plugin is for managing WordPress cron events. It's unrelated to real system cron events.…

3 weeks ago
Wrote a comment on the post Passing arguments to template files in WordPress 5.5, on the site Make WordPress Core:
Even in a future with full site editing, there's still plenty of need for template…

4 weeks ago
Posted a reply to Query Monitor not logging UPDATE or INSERT, on the site WordPress.org Forums:
Are you trying to view these queries on the page after a redirect has been…

4 weeks ago
Posted a reply to Issues with Woo Customer Info being transferred to other customer accounts, on the site WordPress.org Forums:
Sounds like something you should contact the WooCommerce team about. User Switching uses standard WordPress…

4 weeks ago
Posted a reply to WooCommerce Order Details, on the site WordPress.org Forums:
I'll take a look.

4 weeks ago
Posted a reply to Anyway to get sig in callback function?, on the site WordPress.org Forums:
I don't believe this is possible because the cron event runs asynchronously. In addition, the…

4 weeks ago
Posted a reply to Failed to the delete the cron event crontrol_cron_job., on the site WordPress.org Forums:
WordPress cron events aren't real cron events so cron -l won't show you anything. This…

1 month ago
Posted a reply to Is it possible to get a paid customization for this plugin, on the site WordPress.org Forums:
Thanks for the enquiry but I'm not available for paid work at the moment. I…

1 month ago
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…

1 month 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…

1 month 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…

1 month 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…

1 month 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 month 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 month 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 month 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…

1 month 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…

1 month 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,…

1 month 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 months 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 months 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 months 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 months 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…

2 months ago
Committed [2328560] to Plugins Trac:
Update to version 1.5.5 from GitHub

2 months ago