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 Organizer
WordCamp Organizer
WordCamp Speaker
WordCamp Speaker
Plugin Developer
Plugin Developer

Activity
Plugins
Favorites

Posted a reply to Unwanted warning notices, on the site WordPress.org Forums:
I'm not sure. The fresh keyword isn't in Query Monitor so this looks like a…

12 hours ago
Joined the organizing team for WordCamp Europe 2020 coming up on June 4th

15 hours ago
Posted a reply to Error message: Uncaught Error: [] operator not supported for strings in, on the site WordPress.org Forums:
You'll need to contact the author of the theme about this error and send them…

5 days ago
Posted a reply to Page Generation Time, profiling, on the site WordPress.org Forums:
Unfortunately QM isn't too well suited to profiling third party code unless you are able…

6 days ago
Posted a reply to Next Exception, unexpected ‘)’, on the site WordPress.org Forums:
This is caused by Query Monitor re-throwing the fatal error that it's caught and (hopefully)…

1 week ago
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…

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

4 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…

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

1 month 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?

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

1 month 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…

1 month 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…

1 month 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/

1 month 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…

1 month 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…

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

1 month 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…

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

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

1 month 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…

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

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

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

2 months 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…

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

2 months 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…

2 months ago
Committed [2204931] to Plugins Trac:
Committing assets for 1.5.3

2 months ago
Committed [2204929] to Plugins Trac:
Committing assets for 1.5.3

2 months ago
Committed [2204889] to Plugins Trac:
Tagging 3.5.2

2 months ago
Committed [2204888] to Plugins Trac:
Committing 3.5.2 to trunk

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

2 months ago
Committed [2204666] to Plugins Trac:
Tagging 3.5.1

2 months ago
Committed [2204665] to Plugins Trac:
Committing 3.5.1 to trunk

2 months 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…

2 months 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…

2 months ago
Committed [2202868] to Plugins Trac:
Tagging 3.5.0

2 months ago
Committed [2202867] to Plugins Trac:
Committing 3.5.0 to trunk

2 months 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…

2 months 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…

2 months 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…

2 months 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…

2 months ago
Committed [2202246] to Plugins Trac:
Committing assets for 2.0.0-beta1

2 months 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…

2 months 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…

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

2 months 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…

2 months ago
Closed ticket #48762, in Core Trac:
Twenty Twenty: Add WooCommerce compatibility

2 months 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…

2 months 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…

2 months ago