John Blackbourn – @johnbillion

Member Since: December 7th, 2005
Location: Tonbridge, UK; and Torino, Italy
Website: johnblackbourn.com
GitHub: johnbillion
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 a Principal Web Engineer at Human Made.

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

Contributions Sponsored

John Blackbourn contributes 4 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

Reopened ticket #51734, in Core Trac:
Run core unit tests from src again, again

4 hours ago
Committed [50501] to Core Trac:
Build/Test Tools: Ensure the ...

1 day ago
Posted a reply to Maximum call stack size exceeded, on the site WordPress.org Forums:
Sorry but there's not enough information here for me to be able to help you.…

2 days ago
Posted a reply to Different WooCommerce order status, on the site WordPress.org Forums:
Yeah there are some helpers in User Switching for this. You'll need somebody to write…

2 days ago
Committed [2486237] to Plugins Trac:
Updating readme/assets from GitHub

3 days ago
Created a new ticket, #52708, in Core Trac:
Loopback requestss do not work on the local development environment

3 days ago
Wrote a comment on the post Introducing script attributes related functions in WordPress 5.7, on the site Make WordPress Core:
Thanks, fixed.

3 days ago
Posted a reply to Ne fonctionne pas correctement, on the site WordPress.org Forums:
Why didn't you post a thread in the support forum to ask for help before…

3 days ago
Posted a reply to Edit of phpcron event is not saved, on the site WordPress.org Forums:
I added some info to the wiki about this problem. There's not much to add…

3 days ago
Posted a reply to Query Monitor causes Wordfence scan failure, on the site WordPress.org Forums:
Unfortunately there's not really anything that can be done about this. The underlying problem is…

4 days ago
Closed ticket #40536, in Core Trac:
Imagick tests cannot be tested on Travis

4 days ago
Committed [50464] to Core Trac:
Build/Test Tools: PHPUnit test improvements: * Switch back to running ...

5 days ago
Committed [50463] to Core Trac:
Build/Test Tools: Remove redundant teardown functionality from ...

5 days ago
Committed [50450] to Core Trac:
Build/Test Tools: Fix and standardise calls to the `tearDown()` method ...

1 week ago
Committed [50449] to Core Trac:
Build/Test Tools: Fix and standardise calls to the `setUp()` and ...

1 week ago
Committed [50448] to Core Trac:
Build/Test Tools: Add some more tests that perform HTTP requests to ...

1 week ago
Posted a reply to change switch url, on the site WordPress.org Forums:
Nope sorry, that's part of the security mechanism. If you need to fetch the URL…

1 week ago
Posted a reply to No option to “Add PHP Cron Event”, on the site WordPress.org Forums:
Click the “Add New” button on the Cron Events screen, and from there you can…

1 week ago
Posted a reply to error with mailpoet, on the site WordPress.org Forums:
Thanks. Which version of WooCommerce are you using please?

2 weeks ago
Posted a reply to Could developer help me to write a function turn off/on plugins?, on the site WordPress.org Forums:
Sorry but this is beyond the level of support I can provide. I hope you…

2 weeks ago
Committed [2478565] to Plugins Trac:
Update to version 1.10.0 from GitHub

2 weeks ago
Created a new ticket, #5631, in Meta Trac:
Missing bottom padding in the callout block types

2 weeks ago
Wrote a comment on the post Introducing new Post Parent related functions in WordPress 5.7, on the site Make WordPress Core:
Update: These functions were originally introduced as get_parent_post() and has_parent_post() but have since been renamed…

2 weeks ago
Wrote a comment on the post Introducing new Post Parent related functions in WordPress 5.7, on the site Make WordPress Core:
Thanks Mike, the example code has been updated.

2 weeks ago
Posted a reply to Can’t switch from shop manager to shop staff, on the site WordPress.org Forums:
Yes, please take a look at the FAQs for how to grant this ability to…

2 weeks ago
Posted a reply to Not working properly, on the site WordPress.org Forums:
This is most likely a problem caused by another plugin on your site such as…

2 weeks ago
Posted a reply to Using PHP or JSON encoded array to pull in specific email address for template, on the site WordPress.org Forums:
Sorry but this is beyond the level of support I can provide. I hope you…

2 weeks ago
Posted a reply to Unable to access orders window in dashboard, on the site WordPress.org Forums:
Thanks for the report. * Do you see any JavaScript errors in your browser console?…

3 weeks ago
Posted a reply to Query monitor does not seem to show INSERTS?, on the site WordPress.org Forums:
It tracks all queries, this just means there were no INSERT queries performed on this…

3 weeks ago
Posted a reply to unable to save custom event, on the site WordPress.org Forums:
Thanks again for the reports everyone. This was indeed related to the DISALLOW_FILE_EDIT constant. I've…

3 weeks ago
Committed [2474325] to Plugins Trac:
Update to version 1.9.1 from GitHub

3 weeks ago
Posted a reply to Question: Object Cache interfering with Cron status, on the site WordPress.org Forums:
Ah I see. There's no transient or cache for this, it's calculated based on the…

3 weeks ago
Posted a reply to Question: Object Cache interfering with Cron status, on the site WordPress.org Forums:
I'm not sure what you're referring to when you say the "last run" time, there's…

3 weeks ago
Posted a reply to PHP Cron Events keeps on deleting itself, on the site WordPress.org Forums:
* Do any other events disappear? * How often is the event scheduled to run?…

3 weeks ago
Posted a reply to unable to save custom event, on the site WordPress.org Forums:
Sorry folks I haven't had a chance to look into this. I'll do so within…

3 weeks ago
Posted a reply to QM + W3TC + Redis -> Object cache statistics are not available, on the site WordPress.org Forums:
Can you let me know the exact object-cache.php driver you're using? Is it one from…

3 weeks ago
Posted a reply to The symlink at … is no longer pointing, on the site WordPress.org Forums:
You can delete the symlink like you delete a regular file. If this message shows…

4 weeks ago
Posted a reply to server cron job, on the site WordPress.org Forums:
Yep. There's a bunch of info about this here: https://github.com/johnbillion/wp-crontrol/wiki/Cron-events-that-have-missed-their-schedule

4 weeks ago
Posted a reply to User switching does not work on React JS and JSON Web Token (JWT) based login, on the site WordPress.org Forums:
Is JWT used for the actual login mechanism or just for authentication to REST API…

4 weeks ago
Posted a reply to PHP Warning generated, on the site WordPress.org Forums:
Thanks for the report. This might be caused by a cron event that contains a…

4 weeks ago
Posted a reply to No option to “Add PHP Cron Event”, on the site WordPress.org Forums:
Also it looks like the instructions are out of date. The "Add PHP Cron Event"…

4 weeks ago
Posted a reply to No option to “Add PHP Cron Event”, on the site WordPress.org Forums:
Does your user account have permission to edit files? For example via the plugin editor…

4 weeks ago
Posted a reply to Complete list of functionality disabled with conflicting db.php?, on the site WordPress.org Forums:
I think this is everything: * Component column in the Queries panel * Rows column…

4 weeks ago
Posted a reply to Does Query Monitor impact performance for customers?, on the site WordPress.org Forums:
This applies to all page requests, but to a lesser degree for non logged in…

4 weeks ago
Posted a reply to Time stats for queries, in seconds?, on the site WordPress.org Forums:
That's correct, these times are in seconds. There's a bit more info here: https://github.com/johnbillion/query-monitor/wiki/How-to-use The…

1 month ago
Wrote a comment on the post Committers, Maintainers, and Emeriti, on the site Make WordPress Core:
I agree, although I think if a committer hasn't committed in a number of years…

1 month ago
Posted a reply to Unexpected HTTP response code: 404, on the site WordPress.org Forums:
Does the wp-cron.php file actually exist? Once you determine that, you can decide whether you…

1 month ago
Posted a reply to Switch back button (for your theme template), on the site WordPress.org Forums:
Oh apologies, the FAQ item doesn't cover switching back. I'll get it updated with your…

1 month ago
Posted a reply to Switch back button (for your theme template), on the site WordPress.org Forums:
Thanks for the post! This is already covered in the FAQ: https://wordpress.org/plugins/user-switching/#can%20i%20add%20a%20custom%20%22switch%20to%22%20link%20to%20my%20own%20plugin%20or%20theme%3F

1 month ago
Posted a reply to Plugin Conflict with Easy Testimonials: Invalid header error, on the site WordPress.org Forums:
Looks like you have the wrong forum. This error is coming from the easy-testimonials plugin.

1 month ago