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 #48242, in Core Trac:
Deprecate wp_parse_url() in favour of native parse_url()

2 days ago
Closed ticket #42133, in Core Trac:
Add filter to emails sent by wp_new_blog_notification()

4 days ago
Committed [49048] to Core Trac:
Upgrade/Install: Introduce the `wp_installed_email` filter for ...

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

4 days 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.

5 days ago
Closed ticket #51382, in Core Trac:
Multisite: Add missing options to the list of languages

6 days 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 week ago
Created a new ticket, #51374, in Core Trac:
The initial revision of an imported post goes missing

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

1 week ago
Closed ticket #51354, in Core Trac:
Certificate verification disabled (sslverify=false) WP-CRON

1 week ago
Closed ticket #42132, in Core Trac:
Add filter to emails sent by wp-admin/user-new.php

1 week ago
Committed [49029] to Core Trac:
Users: Introduce the `invited_user_email` filter for filtering the ...

1 week ago
Committed [49028] to Core Trac:
Docs: Correct the indentation for some array type docs. See #50768

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

1 week ago
Closed ticket #37366, in Core Trac:
Restoring a scheduled post can cause it to be published

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

2 weeks 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.

2 weeks 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.

2 weeks 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?

2 weeks 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…

2 weeks 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…

2 weeks 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…

2 weeks 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…

2 weeks 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…

2 weeks 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 weeks ago
Posted a reply to User Switching Plugin Issue with Banhammer, on the site WordPress.org Forums:
This means Banhammer is returning an invalid value from its removable_query_args filter. See https://developer.wordpress.org/reference/hooks/removable_query_args/. null…

2 weeks ago
Posted a reply to PHP Error showing up that isnt there, on the site WordPress.org Forums:
The Ajax errors you'll need to report to the author of whichever plugin is causing…

2 weeks ago
Posted a reply to PHP Error showing up that isnt there, on the site WordPress.org Forums:
If your server isn't set to 0 then this means something changed it at runtime.…

2 weeks ago
Posted a reply to Switch user link in PHP file, on the site WordPress.org Forums:
Yep. https://wordpress.org/support/topic/include-user-switching-link-outside-users-php/

2 weeks ago
Posted a reply to How to see the Total number of request to the database in the last 24 hours?, on the site WordPress.org Forums:
Nope sorry, QM only shows data for the current request. You'll need to enable a…

3 weeks ago
Posted a reply to Possible to tell who is impersonating a user?, on the site WordPress.org Forums:
Yep you can get this from the current_user_switched() function, which returns the WP_User object of…

3 weeks ago
Posted a reply to Uncaught SyntaxError: Unexpected token ‘<', on the site WordPress.org Forums:
This probably means you have an error on your site that you need to fix.…

3 weeks ago
Posted a reply to Use of undefined constant QM_HIDE_SELF, on the site WordPress.org Forums:
Thanks for letting me know. That plugin has caused similar problems in the past. I…

3 weeks ago
Posted a reply to WP Config Panel doesn’t workwhen QM is Active, on the site WordPress.org Forums:
What's "WP Config Panel"? Do you see any errors in your browser developer console? Do…

3 weeks ago
Posted a reply to Error Message or Event Completed?, on the site WordPress.org Forums:
That's a bit of a mystery error. It indicates a network problem with your site.…

3 weeks ago
Posted a reply to Error Message or Event Completed?, on the site WordPress.org Forums:
This means the event failed to run. If the event has missed its time by…

3 weeks ago
Posted a reply to Doesn’t Switch, on the site WordPress.org Forums:
Did you make any other changes to your website? Did your web host install or…

4 weeks ago
Posted a reply to Cant see shop user, on the site WordPress.org Forums:
You'll need to ask WooCommerce support about this.

4 weeks ago
Posted a reply to Not visible on front end when logged out and when you’ve disabled dashicons, on the site WordPress.org Forums:
Thanks for the message. I'm not sure how Permatters prevents assets from loading, it may…

1 month ago
Posted a reply to Critical error which leads to user getting deleted (and content), on the site WordPress.org Forums:
Thanks for letting me know.

1 month ago
Posted a reply to PHP warnings that will throw an error in future PHP versions, on the site WordPress.org Forums:
When does this error occur please? By default these constants are not used until after…

1 month ago
Posted a reply to weekly cron questions, on the site WordPress.org Forums:
Thanks for the recording. That means there's a bit of a mystery error occurring when…

1 month ago
Posted a reply to Run now button duplicate job with 01-01-1970 date, on the site WordPress.org Forums:
@fnorte Can you check the Tools -> Site Health screen and see if there's a…

1 month ago
Posted a reply to weekly cron questions, on the site WordPress.org Forums:
You can click Edit next to the event, and from there you can set the…

1 month ago
Posted a reply to Critical error which leads to user getting deleted (and content), on the site WordPress.org Forums:
Sorry but User Switching can't delete anything, this plugin just switches the user account and…

1 month ago
Posted a reply to cURL error 6: Could not resolve host, on the site WordPress.org Forums:
I'm sorry I'm unable to help debug individual issues that WP Crontrol alerts you about,…

1 month ago
Posted a reply to [PHP ERROR] Report.., on the site WordPress.org Forums:
Can you provide some more info? A list of errors on its own isn't useful.

1 month ago
Posted a reply to Error with Cache_File.php, on the site WordPress.org Forums:
You should contact the developer of the plugin for advice. Query Monitor tells you about…

1 month ago