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 #51605, in Core Trac:
Cron hook does not receive $args array

8 hours ago
Committed [49357] to Core Trac:
Cron API: Improve the inline documentation for the args passed to the ...

8 hours 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…

13 hours 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…

2 days 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…

5 days 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…

6 days 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…

6 days ago
Closed ticket #50695, in Core Trac:
Make media_sideload_image extension list filterable

1 week ago
Committed [49198] to Core Trac:
Media: Add an `image_sideload_extensions` filter to the list of ...

1 week ago
Committed [49197] to Core Trac:
Docs: Further corrections and promotions for docblocks relating to ...

1 week ago
Committed [49196] to Core Trac:
Docs: Improve the docs for the globals that are used in the actions ...

1 week ago
Closed ticket #43640, in Core Trac:
Add an audio and video player to the media manager modal

1 week ago
Committed [49195] to Core Trac:
Media: Add an audio and video player to the media manager modal. This ...

1 week ago
Closed ticket #19278, in Core Trac:
Allow WP_List_Table ::get_bulk_items() to receive a nested array and ...

1 week ago
Committed [49190] to Core Trac:
Administration: Allow `WP_List_Table::get_bulk_items()` to receive a ...

1 week 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…

2 weeks 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 weeks 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 weeks 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 weeks ago
Posted a reply to Table is present in Database but Seeing error does’t exist, on the site WordPress.org Forums:
Query Monitor just displays the errors that it gets from MySQL, sorry!

2 weeks ago
Posted a reply to 404 on Pages/Posts and Add Pages/Posts, on the site WordPress.org Forums:
Thanks for letting me know!

2 weeks ago
Posted a reply to Unable to pay for woo orders once switched to user, on the site WordPress.org Forums:
This is a difficult one. If you create a customer account and manually log in…

3 weeks ago
Posted a reply to 404 on Pages/Posts and Add Pages/Posts, on the site WordPress.org Forums:
Do you have a large number of PHP errors being logged, or a large number…

3 weeks ago
Posted a reply to Export?, on the site WordPress.org Forums:
Unfortunately not, although it's something I'm working on. You can copy and paste from a…

3 weeks ago
Posted a reply to error in customizer while query monitor is active, on the site WordPress.org Forums:
Can you check in your server error log to find the cause of those 502…

3 weeks ago
Posted a reply to WP 5.5.1 cannot show PHP Error, Script & Style, on the site WordPress.org Forums:
* Are there any errors in your PHP error log? * Are there any JavaScript…

3 weeks ago
Posted a reply to Cron running dated 50 years ago, on the site WordPress.org Forums:
In that case you'll need to contact your web host about this because the cron…

3 weeks ago
Posted a reply to Cron running dated 50 years ago, on the site WordPress.org Forums:
That error message is your problem. You'll need to contact your web host for help…

3 weeks ago
Posted a reply to Cron running dated 50 years ago, on the site WordPress.org Forums:
Is there a warning at the top of this screen about the cron spawner not…

3 weeks ago
Posted a reply to user control their other shop acounts, on the site WordPress.org Forums:
I'm not sure what you mean but there's a bunch of info about customising the…

3 weeks ago
Posted a reply to PHP Warning, on the site WordPress.org Forums:
Thanks for the report. Does this happen with all your other plugins deactivated? Do these…

4 weeks ago
Posted a reply to Slow Queries on wp_options, on the site WordPress.org Forums:
Unfortunately I don't have time to help debug individual problems with sites. It would be…

4 weeks ago
Posted a reply to False positive duplicate queries, on the site WordPress.org Forums:
Query Monitor fetches the queries directly from WordPress, so they must be running some how.…

4 weeks ago
Posted a reply to whoami, on the site WordPress.org Forums:
This is something you need to speak to your web host about.

1 month ago
Posted a reply to Can i update wordpress stocks by taking a csv file from drive with Wp Cron?, on the site WordPress.org Forums:
I've no idea, this is well outside the scope of support for this plugin.

1 month ago
Posted a reply to Use of undefined constant QM_HIDE_SELF, on the site WordPress.org Forums:
Thanks @ciromattia , that's very useful. I've seen many problems in the past with WPML…

1 month ago
Posted a reply to Not switching, on the site WordPress.org Forums:
What's the problem? Do you get an error message? Can you try clearing all your…

1 month ago
Posted a reply to User Switching is redirecting but only for some users, on the site WordPress.org Forums:
Do you have a plugin installed which changes the redirect location when a user logs…

1 month ago
Committed [2385938] to Plugins Trac:
Updating readme/assets from GitHub

1 month ago
Committed [2385738] to Plugins Trac:
Updating readme/assets from GitHub

1 month ago
Committed [2384581] to Plugins Trac:
Update to version 1.5.6 from GitHub

1 month ago
Posted a reply to User switching not working, on the site WordPress.org Forums:
There's no requirements, no. I would ask the DAP author to take a look.

1 month ago
Posted a reply to Can I delete this?, on the site WordPress.org Forums:
No idea, sorry. You'll need to find out which plugin added those events.

1 month ago
Posted a reply to Query monitor + Litespeed ESI problem, on the site WordPress.org Forums:
Are there any JavaScript errors in your browser console?

1 month ago
Posted a reply to User switching not working, on the site WordPress.org Forums:
Can you try deactivating all your other plugins one by one please to see if…

1 month ago
Posted a reply to no new cron tab, on the site WordPress.org Forums:
It looks like my screenshots are out of date. The tabs in the screenshots are…

1 month ago
Posted a reply to no new cron tab, on the site WordPress.org Forums:
Thanks for the report. Do you see no tabs across the top of the Cron…

1 month ago
Posted a reply to Cannot remove cron event, on the site WordPress.org Forums:
Thanks for the report. If you click the Delete link next to the event and…

1 month ago
Posted a reply to No switch_user capability (possible post 5.5 update issue), on the site WordPress.org Forums:
Not sure what's happened here but there's no hierarchy or weighting involved. It sounds like…

1 month ago
Posted a reply to User Switching Plugin Issue with Banhammer, on the site WordPress.org Forums:
Banhammer is returning an invalid value from its removable_query_args filter. See https://developer.wordpress.org/reference/hooks/removable_query_args/. null is not…

2 months ago