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

Activity
Plugins
Favorites

Posted a reply to Custom PHP Cron keeps deleting itself?, on the site WordPress.org Forums:
I've seen issues in the past with cron events with recurrences that are shorter than…

6 hours ago
Closed ticket #49268, in Core Trac:
Broken themes should always be listed

1 day ago
Committed [47510] to Core Trac:
Themes: Always list broken themes even if the user cannot take a ...

1 day ago
Closed ticket #48061, in Core Trac:
Do an action when a 404 is triggered

1 day ago
Committed [47509] to Core Trac:
Query: Introduce an action which gets fired when a 404 is triggered. ...

1 day ago
Posted a reply to Query Monitor: Not able to install the plugin due to Missing archive file, on the site WordPress.org Forums:
This seems to be a problem with the filesystem on your site. I would contact…

2 days ago
Posted a reply to Restricting roles a user can switch to, on the site WordPress.org Forums:
This is a tricky thing to achieve because there's an assumption that a user needs…

2 days ago
Posted a reply to External object cache not in use, on the site WordPress.org Forums:
The developer console is a tool in your web browser. If you've not used this…

2 days ago
Posted a reply to External object cache not in use, on the site WordPress.org Forums:
Did you check the developer console for the errors?

2 days ago
Closed ticket #49679, in Core Trac:
Add permalink option on post overview admin page

3 days ago
Posted a reply to Missing Style error, on the site WordPress.org Forums:
Sorry but I'm unable to help you fix issues that QM informs you about. I…

3 days ago
Posted a reply to site error, on the site WordPress.org Forums:
I've no idea what could cause this error to be hidden when QM is active…

1 week ago
Posted a reply to site error, on the site WordPress.org Forums:
Does the error show up in the Query Monitor menu when it's active?

1 week ago
Posted a reply to External object cache not in use, on the site WordPress.org Forums:
Actually that link might not provide the info you need. Your server is set up…

1 week ago
Posted a reply to External object cache not in use, on the site WordPress.org Forums:
https://wordpress.org/support/topic/external-object-cache-not-in-use-2/

1 week ago
Created a new ticket, #49655, in Core Trac:
Correct the image thumbnail logic in media templates

2 weeks ago
Committed [47461] to Core Trac:
Docs: Various docblock corrections and improvements. See #49572

2 weeks ago
Posted a reply to What is this cron?, on the site WordPress.org Forums:
No, sorry. You should try the main support forums.

2 weeks ago
Posted a reply to Checking queries for POST http method (wp-admin/post.php), on the site WordPress.org Forums:
Unfortunately this isn't currently possible. The results you're seeing are fromthe subsequent GET request after…

2 weeks ago
Posted a reply to Allow Switching for other Roles, on the site WordPress.org Forums:
Yep. Check out the FAQ.

2 weeks ago
Wrote a comment on the post All-women Release Squad, on the site Make WordPress Core:
Great initiative. I think you've got this, but if you do need assistance I'm happy…

2 weeks ago
Posted a reply to Help With Missing Dependencies, on the site WordPress.org Forums:
I recommend contacting the author of the whatsapp-for-wordpress plugin as it sounds like there's a…

2 weeks ago
Created a new ticket, #49587, in Core Trac:
Add error handling for the media manager Ajax response

3 weeks ago
Posted a reply to ERR_INCOMPLETE_CHUNKED_ENCODING, on the site WordPress.org Forums:
This means there is a problem with your network, your proxy, your web browser, your…

3 weeks ago
Closed ticket #49571, in Core Trac:
Fake contetnt

3 weeks ago
Posted a reply to How to use this Plug-in Effectively, on the site WordPress.org Forums:
Does your website perform well under heavy read-only load? For example, with a high number…

3 weeks ago
Posted a reply to Getting fatal error when trying to switch, on the site WordPress.org Forums:
You'll need to get in touch with WooCommerce or Woocom Wholesale System.

3 weeks ago
Closed ticket #49476, in Core Trac:
Incorrect links to export/delete personal data in emails

4 weeks ago
Posted a reply to Wonderful too, but failing on DEV/TEST/LIVE Pantheon environment, on the site WordPress.org Forums:
@jcastaneda Hey Jose, thanks for jumping in. What does this bizarre paragraph on the "WordPress…

4 weeks ago
Wrote a new post, Summary for Docs Team Meeting: March 2, 2020, on the site Make WordPress Documentation:
Attendance Milana CapJon AngYui ゆいDenis ŽoljomPrashant BaldhaChris Van PattentheMikeDJb AudrasAkira TachibanaEstela RuedaBirgit Pauli-HaackJono AldersonJohn Blackbourn…

4 weeks ago
Posted a reply to Can this plugin be expanded to allow viewing variables?, on the site WordPress.org Forums:
Yeah there's a third party add-on plugin that allows for this: https://wordpress.org/plugins/query-monitor-extension-checking-variables/ Coincidentally I'm asking…

4 weeks ago
Posted a reply to Not switching at all, on the site WordPress.org Forums:
Ah yes this plugin has been mentioned in years gone past. The issue is that…

4 weeks ago
Posted a reply to Not switching at all, on the site WordPress.org Forums:
This may happen if you have particularly aggressive caching in place on your site, or…

1 month ago
Posted a reply to External object cache not in use, on the site WordPress.org Forums:
This means that you don't have an object cache in use. You may wish to…

1 month ago
Posted a reply to No further cron jobs in one of my sites, on the site WordPress.org Forums:
This means there's a problem on your site that is preventing your WP-Cron events from…

1 month ago
Posted a reply to Externe object-cache niet in gebruik The APCu extension for PHP is installed bu, on the site WordPress.org Forums:
Correct, it checks for several extensions: https://github.com/johnbillion/query-monitor/blob/develop/collectors/cache.php#L80-L83

1 month ago
Posted a reply to cron-job stopped working: error 404, on the site WordPress.org Forums:
It sounds like wp-cron.php got deleted. You'll need to reinstall WordPress. This isn't anything to…

1 month ago
Posted a reply to Externe object-cache niet in gebruik The APCu extension for PHP is installed bu, on the site WordPress.org Forums:
In order for your WordPress site to use APCu for its object cache, you need…

1 month ago
Posted a reply to hooks names with no associated actions, on the site WordPress.org Forums:
Yeah the majority of the time these are events left over by old plugins. The…

1 month ago
Posted a reply to WP-Cron spawning is disabled, on the site WordPress.org Forums:
You'll need to contact your host about this.

1 month ago
Posted a reply to Custom Cron Schedule Stops Running, on the site WordPress.org Forums:
Sorry you're having a problem! WP Crontrol doesn't handle running cron events, so your best…

1 month ago
Posted a reply to Error 502, on the site WordPress.org Forums:
https://wordpress.org/support/topic/502-gateway/

1 month ago
Posted a reply to Get cart should not be called before the wp_loaded action, on the site WordPress.org Forums:
Thanks for the report. Do you have the complete error message to show me, including…

1 month ago
Posted a reply to Redirects to WordPress login Page, on the site WordPress.org Forums:
I'm glad you find it useful! It sounds like there might be another plugin on…

1 month ago
Posted a reply to Switch back link isn’t displaying when Jetpack plugin activated, on the site WordPress.org Forums:
Fixed. Thanks for the reports.

2 months ago
Committed [2240208] to Plugins Trac:
Tagging 1.5.4

2 months ago
Committed [2240207] to Plugins Trac:
Committing 1.5.4 to trunk

2 months ago
Posted a reply to Switch back link isn’t displaying when Jetpack plugin activated, on the site WordPress.org Forums:
Yes I'm working on a fix here: https://github.com/johnbillion/user-switching/pull/49 I should be able to release a…

2 months ago
Created a topic, Attribution, on the site WordPress.org Forums:
Hi. The majority of this plugin's core functionality …

2 months ago
Posted a reply to Log info is not shown inside add_action function callback, on the site WordPress.org Forums:
Are you sure your code is being called before the graphql_register_types action fires? The qm/*…

2 months ago