Christoph Daum (@apermo) – WordPress user profile

Bio

Christoph is a WordPress and PHP specialist, with over 25 years of experience in web development. He started first web projects in the late 90s, some of which are still leading in their field. As technical lead on multiple projects with millions page impressions per month, his responsibilities included theme and plugin development, performance optimizations, and feature planning.

Christoph is a contributor to the WordPress ecosystem, host and founder of his local WordPress Meetup in Dortmund, and a frequent speaker at meetups and WordCamps.

Interests

WordPress, PHP, 3D Printing, DIY

WordPress Origin Story

I started of doing mostly TYPO3 when my good friend Hendrik Luehrsen @luehrsen talked in the highest tones about WordPress. Later during my agency days, I started working with WordPress, and in 2012 I attended my first WordCamp in Berlin, which was called WPCamp. On my second WordCamp in 2013, I met Robert Windisch @nullbyte, well and for everyone who knows Robert, this is all you need to know. Since that day, I’ve only missed a 3 WordCamps in Germany, I became founder and host of my local WordPress Meetup and I’m part of the “usual suspects” to buy a WordCamp ticket on release day.

Since 2014 I call myself an in-house developer for WordPress, doing WordPress as a full-time job. During these days I’ve dug very deep into multiple areas of the WordPress code, found a few bugs, suggested some improvements and the best is yet to come.

Contributions Sponsored

Coding Pioneers GmbH sponsors Christoph Daum to contribute 4 hours per week to the following teams: Community and Core.

Member Since: November 6th, 2011
Location: Germany, Bergkamen
Website: christoph-daum.de
GitHub: apermo
Job Title: Senior Software Developer
Employer: Coding Pioneers
Find me on:

Contribution History

Core Contributor
Documentation Contributor
Meetup Organizer
Plugin Developer
Translation Contributor
Translation Editor
WordCamp Speaker

Activity
Plugins
Courses
Favorites
Translations

Confirmed as a speaker for WordCamp Netherlands 2024
2 hours ago
Created ticket #63518 on Core Trac:
get_blog_details( get_all: false ) not working as expected
1 week ago
Closed ticket #63484 on Core Trac:
Attempt to read property "name" on bool - wp-admin/nav-menus.php :1221
2 weeks ago
Completed the course Open source basics and WordPress on learn.wordpress.org
2 weeks ago
Created ticket #63484 on Core Trac:
Attempt to read property "name" on bool - wp-admin/nav-menus.php :1221
3 weeks ago
Submitted pull request #8827 to WordPress/wordpress-develop:
fix: Fixes the error that getchmod() can cause a fatal error
3 weeks ago
Created ticket #63474 on Core Trac:
getchmod() can cause Fatal error
3 weeks ago
Is the 19th person to arrive at WordCamp Leipzig, Germany 2025
4 weeks ago
Is the 36th person to arrive at WordCamp Vienna 2025
2 months ago
Submitted pull request #8688 to WordPress/wordpress-develop:
refactor(media): Refactor month retrieval and add new function for easier caching
2 months ago
Created ticket #63279 on Core Trac:
Improve `media_library_months_with_files` inside `wp_enqueue_media()`
2 months ago
Mentioned in [60157] on Core SVN:
Docs: Correct the type of the `$return` parameter in `embed_handler_html` filter.
2 months ago
Mentioned in [60149] on Core SVN:
Docs: Correct the type of the `$return` parameter in `embed_handler_html` filter.
2 months ago
Submitted pull request #8661 to WordPress/wordpress-develop:
63248 - PHPDoc fix for embed_handler_html filter
2 months ago
Created ticket #63248 on Core Trac:
PHPDoc for embed_handler_html is misleading
2 months ago
Mentioned in [60140] on Core SVN:
Docs: Correct the type of the $cache parameter in embed_oembed_html.
2 months ago
Mentioned in [60127] on Core SVN:
Docs: Correct the type of the `$cache` parameter in `embed_oembed_html`.
2 months ago
Submitted pull request #8640 to WordPress/wordpress-develop:
docs: fixed parameter type for embed_oembed_html filter in WP_Embed::shortcode()
2 months ago
Created ticket #63220 on Core Trac:
Documentation for embed_oembed_html misleading
2 months ago
Pull request #144 merged into WordPress/wpcs-docs:
require/import vs require/include in PHP Coding Standards Documentation. - Fix for #143
3 months ago
Received props from @JeffPaul in Slack:
Props to @audrasjb @davidbaumwald @michelleames @Ankit K Gupta @zunaid321 @narenin @sukhendu2002 @jigar9998 @qhaensler @zeelthakkar @lumiblog…
3 months ago
Mentioned in [59987] on Core SVN:
Media: Add 'muted' attribute and normalize HTML attributes.
3 months ago
Confirmed as a speaker for WordCamp Vienna 2025
3 months ago
Mentioned in [59951] on Core SVN:
Editor: Fix unexpected behavior due to conflicting custom block template.
3 months ago
Submitted pull request #8434 to WordPress/wordpress-develop:
feat: Added action 'maybe_serialize_data_is_serialized' to inform about double serialization.
3 months ago
Mentioned in [59870] on Core SVN:
Date/Time: Add sanitization to `WP_Locale::get_month()`.
4 months ago
Mentioned in [59759] on Core SVN:
Administration: Fix pagination in categories, tags, and plugins tables.
4 months ago
Mentioned in [59727] on Core SVN:
Administration: Fix pagination in categories, tags, and plugins tables.
4 months ago
Submitted pull request #8191 to WordPress/wordpress-develop:
feat(WP_Term): added getter and setter for backwards compatibility
5 months ago
Created ticket #62863 on Core Trac:
_make_cat_compat() - dynamic properties deprecated in PHP 8.2
5 months ago
Mentioned in [59704] on Core SVN:
Docs: Improve @return docblock section for `get_category()`.
5 months ago
Submitted pull request #8166 to WordPress/wordpress-develop:
docs(get_category()): Changed PHPDoc for return and added more information
5 months ago
Created ticket #62842 on Core Trac:
PHPDoc of get_category() is misleading
5 months ago
Submitted pull request #8142 to WordPress/wordpress-develop:
Add sanitization to WP_Locale::get_month()
5 months ago
Created ticket #62824 on Core Trac:
single_month_title() can cause a warning.
5 months ago
Mentioned in [59630] on Core SVN:
REST API: Fix PHP warning about undefined `paged` argument in various REST API endpoints.
5 months ago
Mentioned in [59588] on Core SVN:
Media: enable high bit depth resized image output with Imagick.
5 months ago
Closed pull request #7635 on WordPress/wordpress-develop:
Fix for 62292 - Warning on WP_REST_[...]_Controller::get_items()
6 months ago
Mentioned in [59559] on Core SVN:
Themes: Add an ID to the block theme skip link.
6 months ago
Mentioned in [59548] on Core SVN:
Docs: Update parameter type hints to include `null` for post thumbnail functions.
6 months ago
Created ticket #62720 on Core Trac:
Incomplete phpdoc typehints for get_the_post_thumbnail_url()
6 months ago
Mentioned in [59472] on Core SVN:
Editor: Add description for Banners block pattern category.
7 months ago
Mentioned in [59435] on Core SVN:
Media: Avoid images with `sizes=auto` to be displayed downsized in supporting browsers.
7 months ago
Mentioned in [59433] on Core SVN:
i18n: Account for `load_*_textdomain()` after JIT loading.
7 months ago
Submitted pull request #7847 to WordPress/wordpress-develop:
Notify about double serialization. - 62483
7 months ago
Created ticket #62483 on Core Trac:
maybe_serialize() does support double serialization, but does not the ...
7 months ago
Mentioned in [59430] on Core SVN:
i18n: Account for `load_*_textdomain()` after JIT loading.
7 months ago
Mentioned in [59415] on Core SVN:
Media: Avoid images with `sizes=auto` to be displayed downsized in supporting browsers.
7 months ago
Mentioned in [59411] on Core SVN:
HTML API: Fix normalized doctype pub/sys identifier quotes.
7 months ago
Mentioned in [59410] on Core SVN:
HTML API: Fix normalized doctype pub/sys identifier quotes.
7 months ago