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

Closed ticket #51720, in Core Trac:
Make wp_array_get internal for now. Add tests to _wp_array_get;

13 hours ago
Committed [49580] to Core Trac:
General: Convert `wp_array_get()` to a "private" function and add ...

13 hours 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…

1 day ago
Reopened ticket #40568, in Core Trac:
Add an action in WP_Error::add()

2 days 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…

2 days ago
Closed ticket #51752, in Core Trac:
Enable the static variable in wp_get_environment_type() to be reset

2 days 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 days 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 days 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 days ago
Created a new ticket, #51735, in Core Trac:
Increase the reliability of backing up the mu-plugins directory during ...

4 days ago
Created a new ticket, #51734, in Core Trac:
Run core unit tests from src again, again

4 days ago
Committed [49544] to Core Trac:
Docs: Docblock corrections relating to `WP_Post` objects. See #51373, ...

4 days ago
Closed ticket #51665, in Core Trac:
wp_get_image_editor() ->save stopped creating the directory in ...

4 days ago
Committed [49542] to Core Trac:
Media: Restore the ability of `WP_Image_Editor_Imagick->save()` to ...

4 days ago
Closed ticket #44203, in Core Trac:
Native fields for Google reCAPTCHA API key

4 days 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…

6 days 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:…

1 week 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…

1 week 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…

1 week 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…

1 week 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.

1 week 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…

1 week 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…

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

2 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…

2 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…

2 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…

2 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…

2 weeks 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…

2 weeks 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 weeks 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…

3 weeks 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…

3 weeks 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…

3 weeks 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…

4 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…

4 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…

4 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…

4 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!

4 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!

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month 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…

1 month ago