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 Not visible on front end when logged out and when you’ve disabled dashicons, on the site WordPress.org Forums:
Thanks for the message. I'm not sure how Permatters prevents assets from loading, it may…

56 mins ago
Posted a reply to Critical error which leads to user getting deleted (and content), on the site WordPress.org Forums:
Thanks for letting me know.

1 day ago
Posted a reply to PHP warnings that will throw an error in future PHP versions, on the site WordPress.org Forums:
When does this error occur please? By default these constants are not used until after…

2 days ago
Closed ticket #51163, in Core Trac:
unwatching Trac ticket doesn't stop the email updates

2 days ago
Created a new ticket, #51162, in Core Trac:
Consider adding "offline" as environment on WP_ENVIRONMENT_TYPE

2 days ago
Posted a reply to weekly cron questions, on the site WordPress.org Forums:
Thanks for the recording. That means there's a bit of a mystery error occurring when…

2 days ago
Posted a reply to Run now button duplicate job with 01-01-1970 date, on the site WordPress.org Forums:
@fnorte Can you check the Tools -> Site Health screen and see if there's a…

2 days ago
Posted a reply to weekly cron questions, on the site WordPress.org Forums:
You can click Edit next to the event, and from there you can set the…

2 days ago
Posted a reply to Critical error which leads to user getting deleted (and content), on the site WordPress.org Forums:
Sorry but User Switching can't delete anything, this plugin just switches the user account and…

2 days ago
Posted a reply to cURL error 6: Could not resolve host, on the site WordPress.org Forums:
I'm sorry I'm unable to help debug individual issues that WP Crontrol alerts you about,…

3 days ago
Closed ticket #49077, in Core Trac:
Add https://github.com/WordPress/wordpress-develop to Packagist

3 days ago
Closed ticket #35249, in Core Trac:
Unit tests should pass

3 days ago
Closed ticket #10201, in Core Trac:
Remove user-specific caps

3 days ago
Closed ticket #28371, in Core Trac:
Use media post type object capabilities to allow user to see actions

3 days ago
Posted a reply to [PHP ERROR] Report.., on the site WordPress.org Forums:
Can you provide some more info? A list of errors on its own isn't useful.

4 days ago
Posted a reply to Error with Cache_File.php, on the site WordPress.org Forums:
You should contact the developer of the plugin for advice. Query Monitor tells you about…

4 days ago
Closed ticket #51128, in Core Trac:
Public query var "page" is being stripped from the url after wordpress ...

5 days ago
Created a new ticket, #51127, in Core Trac:
Remove non-color related styling from Modern color scheme

5 days ago
Created a new ticket, #51126, in Core Trac:
Document the update offer parameter for auto updates

5 days ago
Closed ticket #50456, in Core Trac:
Multisite robots.txt files should reference all network XML sitemaps

5 days ago
Posted a reply to Use of undefined constant QM_HIDE_SELF, on the site WordPress.org Forums:
Where does this error display please? Are you using any add-on plugins for Query Monitor?

5 days ago
Wrote a comment on the post Proposal: Dropping support for old PHP versions via a fixed schedule, on the site Make WordPress Core:
Thanks for this post Juliette, and thanks Matt for discussing the issue with her. I…

5 days ago
Posted a reply to PHP Parse error: syntax error in wp-crontrol.php, on the site WordPress.org Forums:
Correct but the syntax error is coming from code that's been added by a user…

6 days ago
Posted a reply to PHP Parse error: syntax error in wp-crontrol.php, on the site WordPress.org Forums:
This is caused by a syntax error in one of your PHP Cron events.

6 days ago
Posted a reply to QM 3.6.4 and WP 5.5 compatybility, on the site WordPress.org Forums:
Possibly yes. It's definitely not a file that exists in WordPress by default.

6 days ago
Posted a reply to Link Specific Accounts, on the site WordPress.org Forums:
This is possible but you'll need to be familiar with the user roles and capabilities…

6 days ago
Posted a reply to QM 3.6.4 and WP 5.5 compatybility, on the site WordPress.org Forums:
@rex2020 Also there's no such file as wp-includes/init.php, I suggest that you run a virus…

6 days ago
Posted a reply to QM 3.6.4 and WP 5.5 compatybility, on the site WordPress.org Forums:
@rex2020 This is correct. Previous versions of Query Monitor didn't report some types of error,…

6 days ago
Posted a reply to QM 3.6.4 and WP 5.5 compatybility, on the site WordPress.org Forums:
Thanks for the update.

1 week ago
Committed [2366559] to Plugins Trac:
Updating readme/assets from GitHub

1 week ago
Posted a reply to QM 3.6.4 and WP 5.5 compatybility, on the site WordPress.org Forums:
This could be related to jQuery changes in WordPress 5.5. The cause is likely to…

1 week ago
Posted a reply to WooCommerce Analytics > Revenue tab not loading, on the site WordPress.org Forums:
Fixed in 3.6.4. See https://wordpress.org/support/topic/compatablity-problems-with-yoast/#post-13288380 for details.

1 week ago
Committed [2365946] to Plugins Trac:
Update to version 3.6.4 from GitHub

1 week ago
Posted a reply to Uncaught Error: Call to a member function get_component() on null, on the site WordPress.org Forums:
Fixed in 3.6.4. See https://wordpress.org/support/topic/compatablity-problems-with-yoast/#post-13288380 for details.

1 week ago
Posted a reply to Compatablity problems with Yoast, on the site WordPress.org Forums:
Ironically this error was caused by the extra error handling I introduced in 3.6.2 so…

1 week ago
Posted a reply to Uncaught Error: Call to a member function get_component() on null, on the site WordPress.org Forums:
Thanks for the report. I'll check this out straight away.

1 week ago
Posted a reply to WooCommerce Analytics > Revenue tab not loading, on the site WordPress.org Forums:
Thanks for the report. I'll check this out straight away.

1 week ago
Posted a reply to Compatablity problems with Yoast, on the site WordPress.org Forums:
Thanks for the report. I'll check this out straight away.

1 week ago
Posted a reply to One PHP Notice left after last update, on the site WordPress.org Forums:
Cross your fingers Jacob! :D This should be fixed in 3.6.2.

1 week ago
Wrote a comment on the post New wp_get_environment_type() function in WordPress 5.5, on the site Make WordPress Core:
This is an interesting use case that I haven't heard discussed so far. You will…

1 week ago
Committed [2365593] to Plugins Trac:
Update to version 3.6.2 from GitHub

1 week ago
Posted a reply to You cannot add, edit, or delete PHP cron events because your user account does n, on the site WordPress.org Forums:
Right, but you don't have the ability to edit files, which means it's been disabled…

2 weeks ago
Posted a reply to Cron Job Question, on the site WordPress.org Forums:
If you delete the event via WP Crontrol then the event will be deleted BUT…

2 weeks ago
Posted a reply to Disable Query Monitor output from CSV export, on the site WordPress.org Forums:
This depends on what the request looks like when you export the CSV. There's a…

2 weeks ago
Posted a reply to Cron Job Question, on the site WordPress.org Forums:
I think you need to contact the author of the premium plugin as this isn't…

2 weeks ago
Posted a reply to Cron Job Question, on the site WordPress.org Forums:
Whether or not the default WP Cron runner is disabled shouldn't affect this. It might…

2 weeks ago
Posted a reply to You cannot add, edit, or delete PHP cron events because your user account does n, on the site WordPress.org Forums:
Not sure that link works properly. The answer is in the FAQ section of the…

2 weeks ago
Posted a reply to You cannot add, edit, or delete PHP cron events because your user account does n, on the site WordPress.org Forums:
This is most likely because file editing is disabled. More info here: https://wordpress.org/plugins/wp-crontrol/#%0Awhich%20users%20can%20manage%20php%20cron%20events%3F%20is%20this%20dangerous%3F%0A

2 weeks ago
Closed ticket #5377, in Meta Trac:
Plural form with missing plural translation results in blank string

2 weeks ago
Created a new ticket, #5377, in Meta Trac:
Plural form with missing plural translation results in blank string

2 weeks ago