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
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
Plugin Developer
Plugin Developer
Translation Contributor
Translation Contributor
WordCamp Organizer
WordCamp Organizer
WordCamp Speaker
WordCamp Speaker

Activity
Plugins
Favorites
Translations

Posted a reply to Switch To not showing in new user role, on the site WordPress.org Forums:
I'm very sorry but there's too many parts to this for me to be able…

6 hours ago
Posted a reply to All Author Pages Return Error, on the site WordPress.org Forums:
@publishpress I've identified the cause of this problem. PublishPress Authors is calling the is_favicon() function…

2 days ago
Closed ticket #41570, in Core Trac:
Multisite Global Media Settings

3 days ago
Posted a reply to One User Account Suddenly Won’t Switch, on the site WordPress.org Forums:
Did you check the items I mentioned above?

3 days ago
Posted a reply to PHP 7.3, on the site WordPress.org Forums:
Yes. Also there are several tools available for checking PHP version compatibility so you don't…

3 days ago
Posted a reply to Warning sign (Exclamation mark) meaning?, on the site WordPress.org Forums:
Thanks. The orange text right next to the icon points out that the event has…

1 week ago
Posted a reply to Warning sign (Exclamation mark) meaning?, on the site WordPress.org Forums:
Where exactly does the exclamation appear? Can you send a screenshot please?

1 week ago
Closed ticket #50220, in Core Trac:
Contact Form 7 Blocked words

1 week ago
Posted a reply to test host has no DNS, on the site WordPress.org Forums:
This isn't related to WP Crontrol, it's just telling you the error that the WordPress…

1 week ago
Posted a reply to Cron Recurrence Want Update, on the site WordPress.org Forums:
What I meant is, something must be resetting the recurrence of those events after you…

1 week ago
Posted a reply to PHP Errors Not Showing, on the site WordPress.org Forums:
Are there any JavaScript errors showing on the page? Can you run localStorage.clear() in your…

1 week ago
Posted a reply to Cron Recurrence Want Update, on the site WordPress.org Forums:
You should contact the authors of the plugins that are eating your resources instead.

2 weeks ago
Closed ticket #50195, in Core Trac:
Default esc_url scheme

2 weeks ago
Posted a reply to PHP Cron Event in WP Crontrol, on the site WordPress.org Forums:
Sorry I'm unable to help debug your cron events, it would be a full time…

2 weeks ago
Posted a reply to PHP warning in Query monitor, on the site WordPress.org Forums:
It sounds like you've got some custom database configuration going on that's not defining the…

2 weeks ago
Posted a reply to Time zone synch, on the site WordPress.org Forums:
This might be the same issue as this: https://wordpress.org/support/topic/display-next-run-in-sites-timezone/ Can you check?

2 weeks ago
Posted a reply to Disable for some users, on the site WordPress.org Forums:
Admin Bar Query Monitor is a separate plugin. It's not part of QM.

2 weeks ago
Posted a reply to Disable for some users, on the site WordPress.org Forums:
QM is only visible to admins. Maybe you have some user role or capability customisations…

2 weeks ago
Posted a reply to Deleting cron events/jobs, on the site WordPress.org Forums:
There’s a few reasons this can fail internally in WordPress core, unfortunately the error message…

2 weeks ago
Posted a reply to Frontend not working after active query monitor plugin, on the site WordPress.org Forums:
Gonna need a bit more information than that please. What have you tried?

2 weeks ago
Posted a reply to Query Monitor results have me stuck on why my site is super slow, on the site WordPress.org Forums:
For some reason QM is mis-identifying these queries as coming from WordPress core, they're actually…

2 weeks ago
Posted a reply to Php warnings, on the site WordPress.org Forums:
Thanks, this is being tracked here: https://github.com/johnbillion/query-monitor/issues/514

3 weeks ago
Posted a reply to ERROR user switching, on the site WordPress.org Forums:
Your best bet is to try one of the default themes such as Twenty Twenty,…

3 weeks ago
Committed [2301280] to Plugins Trac:
Readme corrections.

3 weeks ago
Committed [2301273] to Plugins Trac:
Update to version 3.6.0 from GitHub

3 weeks ago
Posted a reply to PHP Cron results logged anywhere?, on the site WordPress.org Forums:
Nope but I'm working on it :-)

3 weeks ago
Posted a reply to Cron events won’t run, on the site WordPress.org Forums:
You need to contact your web host.

3 weeks ago
Posted a reply to ERROR user switching, on the site WordPress.org Forums:
Do you have a custom login mechanism on your site?

3 weeks ago
Posted a reply to Ajax Notice : ‘post_content’ of non-object, on the site WordPress.org Forums:
Thanks for the message. This sounds like something on your site, for example a plugin…

3 weeks ago
Posted a reply to Error Argument 2 passed to QM_Collector_Block_Editor::filter_pre_render_block(), on the site WordPress.org Forums:
Try deactivating all your other plugins one by one, and switching to the Twenty Twenty…

3 weeks ago
Posted a reply to conflict with disable-privacy-tools, on the site WordPress.org Forums:
Sorry but I can't support every possible plugin that might change the way the internals…

3 weeks ago
Posted a reply to Plugin Update, on the site WordPress.org Forums:
1.8 was quite a major update. A lot of the internals were refactored. There's no…

3 weeks ago
Posted a reply to All the cron jobs in the past.., on the site WordPress.org Forums:
If the events are showing as in the past then that means your cron events…

3 weeks ago
Posted a reply to What does this mean?, on the site WordPress.org Forums:
There was a problem spawning a call to the WP-Cron system on your site -…

3 weeks ago
Posted a reply to Effect of moving to real server cron?, on the site WordPress.org Forums:
The underlying cron event system in WordPress doesn't actually change when you use this constant,…

3 weeks ago
Posted a reply to Run now button duplicate job with 01-01-1970 date, on the site WordPress.org Forums:
Glad to hear it, and thanks!

3 weeks ago
Posted a reply to Display Next Run in Site’s Timezone, on the site WordPress.org Forums:
Great. You'll definitely want to ensure all your dates and timezones are correct in any…

4 weeks ago
Posted a reply to One User Account Suddenly Won’t Switch, on the site WordPress.org Forums:
Try switching to one of the default themes such as Twenty Twenty, try deactivating your…

4 weeks ago
Posted a reply to Run now button duplicate job with 01-01-1970 date, on the site WordPress.org Forums:
The cron system in WordPress is quite simple, it iterates the values in an option…

4 weeks ago
Posted a reply to Cant save new cron jobs., on the site WordPress.org Forums:
Also, check the Settings -> Cron Schedules screen to see if you see any warnings…

4 weeks ago
Posted a reply to Cant save new cron jobs., on the site WordPress.org Forums:
Thanks, this sounds like another plugin on your site is adding a custom schedule incorrectly…

4 weeks ago
Posted a reply to Run now button duplicate job with 01-01-1970 date, on the site WordPress.org Forums:
When you click "Run now" in Crontrol, what it does is create an exact copy…

4 weeks ago
Committed [47754] to Core Trac:
Docs: Misc docblock corrections and improvements. See #49572

4 weeks ago
Reopened ticket #36439, in Core Trac:
Wrong language when resetting password

4 weeks ago
Closed ticket #50068, in Core Trac:
Plugin Review Changed by Developer

4 weeks ago
Committed [47752] to Core Trac:
Build/Test Tools: Further enhancements to the local development ...

4 weeks ago
Closed ticket #46113, in Core Trac:
Incongruent returned value for wp_get_attachment_image_src

4 weeks ago
Committed [47748] to Core Trac:
Media: Ensure a consistent structure for the array returned by ...

4 weeks ago
Closed ticket #45298, in Core Trac:
Menu Quick Search: Allow searching for empty taxonomy terms

4 weeks ago
Created a new ticket, #5197, in Meta Trac:
Install still isn't a noun

4 weeks ago