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

Posted a reply to Failed to the execute the cron event, on the site WordPress.org Forums:
Sorry you're having a problem but this isn't something I can help with as it's…

2 hours ago
Posted a reply to PHP Error, on the site WordPress.org Forums:
Thanks for the report. This error has been reported a few times but I do…

20 hours ago
Reopened ticket #45114, in Core Trac:
Fire publishing related hooks after all data is saved via the REST API.

2 days ago
Committed [49700] to Core Trac:
Docs: Corrections and improvements to docs for properties of the ...

3 days ago
Posted a reply to open_basedir warning, on the site WordPress.org Forums:
You'll need to contact your web host about this.

4 days ago
Committed [49693] to Core Trac:
Docs: Upgrade more parameters in docblocks to used typed array ...

5 days ago
Committed [49692] to Core Trac:
Docs: Various docblock corrections relating to parameter types. See ...

5 days ago
Posted a reply to Debug SiteMap Generating Queries?, on the site WordPress.org Forums:
Unfortunately no, as QM currently relies on being able to output its HTML panel at…

5 days ago
Created a new ticket, #51870, in Core Trac:
Update all focusable elements to use the new focus style

5 days ago
Committed [2424892] to Plugins Trac:
Updating readme/assets from GitHub

5 days ago
Posted a reply to How can I create a log of all cron jobs, on the site WordPress.org Forums:
This isn't currently possible in WP Crontrol but I am working on it. No ETA…

6 days ago
Committed [49672] to Core Trac:
Docs: Document parameters that accept an array of integers using typed ...

1 week ago
Committed [49671] to Core Trac:
Docs: Add missing `@since` tags. See #51800

1 week ago
Committed [49670] to Core Trac:
Docs: Clarify and standardise on terminology used for rewrite rule ...

1 week ago
Posted a reply to How to add the “switch back” link on the LoginPress form, on the site WordPress.org Forums:
User Switching does provide this. If you deactivate LoginPress you'll see it.

1 week ago
Posted a reply to Switching back to admin retains user details on main admin account only, on the site WordPress.org Forums:
Nope sorry, sounds like your caching is in a muddle unfortunately. Try deactivating anything related…

2 weeks ago
Posted a reply to Do “queries” slow down websites’ loading times?, on the site WordPress.org Forums:
Yes that's correct. Everything that QM shows you is a process which happens during the…

2 weeks ago
Posted a reply to Query monitor + Litespeed ESI problem, on the site WordPress.org Forums:
Are you using QM 3.6.5? I added some extra console warnings to that version, so…

2 weeks ago
Committed [49610] to Core Trac:
Docs: Corrections and improvements to inline docs relating to the REST ...

2 weeks ago
Committed [49606] to Core Trac:
Build/Test Tools: Misc test enhancements. See #51344

2 weeks ago
Committed [2418145] to Plugins Trac:
Update to version 3.6.5 from GitHub

2 weeks ago
Posted a reply to Slow queries in “All Posts”, on the site WordPress.org Forums:
Oh wait, I'm wrong. This is a default query that comes from wp_dropdown_users() that's used…

2 weeks ago
Posted a reply to Slow queries in “All Posts”, on the site WordPress.org Forums:
You can do that, for example WordPress.com VIP Go does this, but it will use…

2 weeks ago
Posted a reply to Slow queries in “All Posts”, on the site WordPress.org Forums:
Unfortunately any meta_value query will be the first to get slow when you have a…

3 weeks ago
Posted a reply to How to add the “switch back” link on the LoginPress form, on the site WordPress.org Forums:
You'll need to get in touch with the author of LoginPress and ask them. It…

3 weeks ago
Posted a reply to disable query monitor, on the site WordPress.org Forums:
You need to get in contact with the author of the elementor-pro plugin.

3 weeks ago
Posted a reply to Site is Blank, on the site WordPress.org Forums:
You need to get in contact with the authors of Elementor.

3 weeks ago
Posted a reply to Unable to activate plugin: PHP error, on the site WordPress.org Forums:
In case you're wondering, this is because trailing commas in function calls are allowed since…

3 weeks ago
Posted a reply to Zend OPcache can’t be temporary enabled, on the site WordPress.org Forums:
Sorry but I can't help fix problems on your site that Query Monitor informs you…

3 weeks ago
Posted a reply to Switch back to admin without admin bar or dashboard?, on the site WordPress.org Forums:
In addition to the admin toolbar there’s a Switch Back button in a few places:…

3 weeks ago
Posted a reply to Relevance of “! None”, on the site WordPress.org Forums:
By the way, if these relate to a plugin that's currently active on your site…

3 weeks ago
Posted a reply to Relevance of “! None”, on the site WordPress.org Forums:
This is a good question and I should add a FAQ for this because you're…

3 weeks ago
Posted a reply to Long running PHP script and “Allowed memory size of * exhausted”, on the site WordPress.org Forums:
The short answer is "sort of". More info here: https://wordpress.org/support/topic/disable-query-monitor-output-from-csv-export/ I'm planning on adding a…

3 weeks ago
Posted a reply to Cronjob for specific URL, on the site WordPress.org Forums:
Create a PHP cron event and request the URL using the HTTP API.

4 weeks ago
Posted a reply to error in customizer while query monitor is active, on the site WordPress.org Forums:
There's no reason to keep it active on prod unless you're investigating an issue or…

4 weeks ago
Posted a reply to error in customizer while query monitor is active, on the site WordPress.org Forums:
In that case do you have a bunch of cookies for the domain in your…

4 weeks ago
Posted a reply to Query monitor + Litespeed ESI problem, on the site WordPress.org Forums:
Any news from Litespeed about this issue?

4 weeks ago
Posted a reply to WP 5.5.1 cannot show PHP Error, Script & Style, on the site WordPress.org Forums:
Are you still seeing this problem? If so, can you send a screenshot please? Have…

4 weeks ago
Posted a reply to error in customizer while query monitor is active, on the site WordPress.org Forums:
Ah, this is most likely caused by the HTTP headers that QM adds when there…

4 weeks ago
Posted a reply to Query Monitor crashes my site, on the site WordPress.org Forums:
Have you had time to try deactivating your other plugins one by one? There's not…

4 weeks ago
Wrote a comment on the post Discussion: align the WordPress release cycle with the industry standard, on the site Make WordPress Core:
I don't think looking at historical data for this is particularly relevant. A bug can…

1 month ago
Posted a reply to Locked out from the dashboard, on the site WordPress.org Forums:
This sounds unrelated to User Switching. All this plugin essentially does is switch the cookies…

1 month ago
Posted a reply to converting wget, on the site WordPress.org Forums:
Sorry but WP Crontrol doesn't manage the way that your WordPress cron events run, it…

1 month ago
Posted a reply to QM 3.6.4 fatals on PHP 7.4, on the site WordPress.org Forums:
Thanks for the report. This sounds like it's caused by an incomplete update from a…

1 month ago
Posted a reply to Cron created disapeared, on the site WordPress.org Forums:
The only thing like this I've seen in the past is when the event recurrence…

1 month ago
Posted a reply to exec(): Unable to fork [whoami] message, on the site WordPress.org Forums:
This is something you'll need to ask your web host about. They might have some…

1 month ago
Posted a reply to How to Check if Switch to is “active”, on the site WordPress.org Forums:
Yep this is possible. Take a look at the FAQ for several bits of info…

1 month ago
Posted a reply to Query Monitor crashes my site, on the site WordPress.org Forums:
Sorry to hear this. * Does the "Query Monitor" item in the admin toolbar show…

2 months ago
Posted a reply to QM displaying on Login page, on the site WordPress.org Forums:
I've seen this occasionally in the past but I haven't been able to track down…

2 months ago
Posted a reply to database delete hierarchy, on the site WordPress.org Forums:
No you don't need to do anything, Query Monitor is showing you the queries that…

2 months ago