John Blackbourn – @johnbillion

Member Since: December 7th, 2005
Location: Tonbridge, UK; and Torino, Italy
Website: johnblackbourn.com
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. 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 Speaker
WordCamp Speaker
Plugin Developer
Plugin Developer

Activity
Plugins
Favorites

Posted a reply to WP Admin slow when Query Monitor active, on the site WordPress.org Forums:
It sounds like something is causing QM to choke on the front end. * Is…

3 days ago
Reopened ticket #49048, in Core Trac:
Add unit tests for v5.3.1 block serialization functions

2 weeks ago
Posted a reply to Ability to add out of stock product to user cart?, on the site WordPress.org Forums:
This depends entirely on the e-commerce solution that you're using. User Switching supports WooCommerce. Try…

2 weeks ago
Closed ticket #49010, in Core Trac:
Deprecate attachment page and its template

2 weeks ago
Posted a reply to Scripts listed as missing but don’t have any dependants, on the site WordPress.org Forums:
Can you send a screenshot of the Styles panel from QM?

3 weeks ago
Created a new ticket, #48966, in Core Trac:
Add PHPCompatibility check to all branches

3 weeks ago
Posted a reply to create a cron job, on the site WordPress.org Forums:
Sorry but I can't help with issues you're having with cron event callbacks. It would…

3 weeks ago
Posted a reply to user account, on the site WordPress.org Forums:
This can be due to one of several things, for example if the DISALLOW_FILE_EDIT constant…

4 weeks ago
Posted a reply to Any way to manually add a switch back link?, on the site WordPress.org Forums:
Yep! See https://wordpress.org/support/topic/switch-to-link-destination/

4 weeks ago
Posted a reply to 502 Gateway, on the site WordPress.org Forums:
Thanks for the report. This isn't anything specific to User Switching. The problem is that…

4 weeks ago
Posted a reply to Disable plugin & hold settings ?, on the site WordPress.org Forums:
Good question. Regular cron events will continue to work because this is standard WP functionality…

4 weeks ago
Committed [46826] to Core Trac:
Docs: Further docblock corrections and improvements. See #48303

4 weeks ago
Posted a reply to Plugin could not be activated because it triggered a fatal error, on the site WordPress.org Forums:
I bet this is due to a stale opcode cache after the plugin update. Are…

4 weeks ago
Committed [46823] to Core Trac:
Docs: Increase the specificity of various docblock parameter types and ...

4 weeks ago
Committed [46821] to Core Trac:
Docs: Correct various docblocks documentation. See #48303

4 weeks ago
Posted a reply to Plugin could not be activated because it triggered a fatal error, on the site WordPress.org Forums:
I wonder if your update or installation went wrong because QM_Collector_Admin doesn't include any abstract…

1 month ago
Posted a reply to Compatibility with Groups?, on the site WordPress.org Forums:
I've no idea what Groups is, sorry.

1 month ago
Closed ticket #34308, in Core Trac:
The _n*() functions don't cater for a string that represents exactly ...

1 month ago
Closed ticket #20771, in Core Trac:
esc_url() instead of esc_html() in wp_nonce_url()

1 month ago
Posted a reply to Log variables, on the site WordPress.org Forums:
Not currently, although it is something I want to add. Maybe some time in the…

1 month ago
Closed ticket #48856, in Core Trac:
Administration Email Verification allows users to update main admin ...

1 month ago
Posted a reply to switch back bar and link not there, on the site WordPress.org Forums:
This is usually due to your theme's CSS causing the Switch Back link to be…

1 month ago
Committed [2204931] to Plugins Trac:
Committing assets for 1.5.3

1 month ago
Committed [2204929] to Plugins Trac:
Committing assets for 1.5.3

1 month ago
Committed [2204889] to Plugins Trac:
Tagging 3.5.2

1 month ago
Committed [2204888] to Plugins Trac:
Committing 3.5.2 to trunk

1 month ago
Posted a reply to Warning: Invalid argument supplied for foreach(), on the site WordPress.org Forums:
Fixed in 3.5.1.

1 month ago
Committed [2204666] to Plugins Trac:
Tagging 3.5.1

1 month ago
Committed [2204665] to Plugins Trac:
Committing 3.5.1 to trunk

1 month ago
Posted a reply to Warning: Invalid argument supplied for foreach(), on the site WordPress.org Forums:
Thanks, I've had a few reports of this problem. I'll take a look and get…

1 month ago
Posted a reply to Can I remove Cron-job, on the site WordPress.org Forums:
Sorry this is outside the scope of the support for this plugin. Your best bet…

1 month ago
Committed [2202868] to Plugins Trac:
Tagging 3.5.0

1 month ago
Committed [2202867] to Plugins Trac:
Committing 3.5.0 to trunk

1 month ago
Posted a reply to “Queries by component” removed?, on the site WordPress.org Forums:
Thanks, in that case you'll need to follow the instructions about putting the db.php symlink…

1 month ago
Posted a reply to “Queries by component” removed?, on the site WordPress.org Forums:
Hi @lcf, is this still an issue? Is there an error message on the main…

1 month ago
Posted a reply to Missing styles, on the site WordPress.org Forums:
Is this still an issue for you @papadope? My usual advice in this situation is…

1 month ago
Posted a reply to Times seem to conflict, on the site WordPress.org Forums:
Thanks for the update, I haven't been able to reproduce this myself but I don't…

1 month ago
Committed [2202246] to Plugins Trac:
Committing assets for 2.0.0-beta1

1 month ago
Posted a reply to Add Cron and Execution Time, on the site WordPress.org Forums:
I don't know, sorry. It looks like your website is very broken. If your website…

1 month ago
Posted a reply to Incomplete PHP Errors results, on the site WordPress.org Forums:
Is Query Monitor network-activated? If not, try that, because that will mean Query Monitor loads…

1 month ago
Posted a reply to Arguments Syntax?, on the site WordPress.org Forums:
Correct!

1 month ago
Posted a reply to Incomplete PHP Errors results, on the site WordPress.org Forums:
Thanks for the message. This tells me that the error is occurring before Query Monitor…

1 month ago
Closed ticket #48762, in Core Trac:
Twenty Twenty: Add WooCommerce compatibility

1 month ago
Posted a reply to Arguments Syntax?, on the site WordPress.org Forums:
Thanks for the message. This isn't an easy thing to figure out because you also…

1 month ago
Posted a reply to Switch Back Link Not Working, on the site WordPress.org Forums:
Ah-ha, in that case you'll need to ask the author of your theme if they…

1 month ago
Posted a reply to Switch Back Link Not Working, on the site WordPress.org Forums:
What do you mean when you say the switch back link doesn't work? Do you…

1 month ago
Posted a reply to One more step for cutom logins URL, on the site WordPress.org Forums:
Which plugin are you using to customise your login URL? What happens when you try…

2 months ago
Wrote a comment on the post 5.3 Retrospective – Call for feedback, on the site Make WordPress Core:
Continue: I like the direction that core and project release organisation is going, with more…

2 months ago
Wrote a comment on the post Noteworthy Admin CSS changes in WordPress 5.3, on the site Make WordPress Core:
Thanks for your comment Andrea. These are all good points.

2 months ago
Wrote a comment on the post Noteworthy Admin CSS changes in WordPress 5.3, on the site Make WordPress Core:
Thanks for your constructive feedback @micasuh! It's very much appreciated, and it appears to me…

2 months ago