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 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…

1 day 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

2 days 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,…

4 days ago
Committed [2301280] to Plugins Trac:
Readme corrections.

4 days ago
Committed [2301273] to Plugins Trac:
Update to version 3.6.0 from GitHub

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

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

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

5 days 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…

6 days 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…

7 days 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…

1 week 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…

1 week 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…

1 week 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 -…

1 week 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,…

1 week 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!

1 week 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…

1 week 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…

1 week 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…

1 week 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…

1 week 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…

1 week 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…

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

1 week ago
Reopened ticket #36439, in Core Trac:
Wrong language when resetting password

1 week ago
Closed ticket #50068, in Core Trac:
Plugin Review Changed by Developer

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

1 week ago
Closed ticket #46113, in Core Trac:
Incongruent returned value for wp_get_attachment_image_src

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

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

1 week ago
Committed [47747] to Core Trac:
Menus: Allow empty taxonomy terms to be surfaced when searching for ...

1 week ago
Closed ticket #47759, in Core Trac:
Suboptimal tab order on the installation success screen

1 week ago
Committed [47746] to Core Trac:
Upgrade/Install: Unlink the logo on the installation and config setup ...

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

2 weeks ago
Posted a reply to Display Next Run in Site’s Timezone, on the site WordPress.org Forums:
I bet I know what the problem is. You should see an error on the…

2 weeks ago
Posted a reply to Display Next Run in Site’s Timezone, on the site WordPress.org Forums:
So the offset is getting doubled up when displayed the time in that column. Weird.…

2 weeks ago
Posted a reply to Deleting Tracking Events, on the site WordPress.org Forums:
I've thought about this in the past and I can see it being useful, but…

2 weeks ago
Committed [2296665] to Plugins Trac:
Update to version 1.8.3 from GitHub

2 weeks ago
Posted a reply to Failed to save the cron event, on the site WordPress.org Forums:
Regarding the Edit, Run Now, and Delete links, these show up underneath the event hook…

2 weeks ago
Posted a reply to Failed to save the cron event, 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 same exact site on two hosts, on the site WordPress.org Forums:
This isn't something I can help you with, sorry. It would be a full time…

2 weeks ago
Posted a reply to Disabling plugin cause site crash, on the site WordPress.org Forums:
This is a problem with the other plugins on your site causing those errors, not…

2 weeks ago
Posted a reply to How can I use this with a REST API?, on the site WordPress.org Forums:
Currently Query Monitor only shows you overview information for REST API requests, plus any PHP…

2 weeks ago
Posted a reply to Sleep process tracking, on the site WordPress.org Forums:
If the sleeps are happening via SELECT SLEEP then they'll show up in Query Monitor,…

2 weeks ago
Posted a reply to Display Next Run in Site’s Timezone, on the site WordPress.org Forums:
* What's the value of the Timezone field on the General Settings screen? * In…

2 weeks ago
Posted a reply to Display Next Run in Site’s Timezone, on the site WordPress.org Forums:
Thanks for the message. Are you running the latest version of the plugin? That's something…

2 weeks ago
Posted a reply to USE ON MULTI-NETWORK INSTALL, on the site WordPress.org Forums:
I don't know about being in the ditch :D but there's nothing fundamental in User…

2 weeks ago
Posted a reply to USE ON MULTI-NETWORK INSTALL, on the site WordPress.org Forums:
Thanks for the message. Why is activating User Switching on one network having an affect…

2 weeks ago
Posted a reply to Won’t let me execute any cron jobs?, on the site WordPress.org Forums:
I've just released a new version which fixes the ability to immediately run an event…

2 weeks ago
Posted a reply to Method for enabling Query Monitor for only specific users, on the site WordPress.org Forums:
I just tested this with the Members plugin and it works as expected for granting…

2 weeks ago
Committed [2291788] to Plugins Trac:
Update to version 1.8.2 from GitHub

2 weeks ago