Felix Arntz MU Plugins

My collection of MU plugins in individual files within a subdirectory, fully configurable in a maintainable way which allows for automatic updates. Learn more about MU plugins.

1. Context
2. Project structure
3. Quick start
4. Included features
5. Alternative usage
6. License

Context

I have been using MU plugins on my personal sites for many years, and I thought some may find them useful as well. I am aware that several individuals and companies have open-sourced some of their MU plugins, but I wanted to go a step further than that by making them actually reusable beyond just my own specific site needs.

With this repository I came up with an approach that allows you to use any of my MU plugins in a way that allows you to customize them and even apply updates to them, without having to manually copy files every time.

Project structure

At a high level, the project is made up by three components:

• The individual MU plugin files felixarntz-mu-plugins/*.php, where each file is for a single standalone feature.
• Some shared utility files felixarntz-mu-plugins/shared/*.php, which some of the individual MU plugin files are using.
• The overarching loader file felixarntz-mu-plugins.php, which loads and configures the individual MU plugin files that you would like to use.

Quick start

Installation

There are several alternative ways to use this project, depending on your needs and flexibility. In any case, the project needs to be placed in your wp-content/mu-plugins directory. If your site doesn't have such a directory yet, you can simply create it.

If you use Composer to manage your site's dependencies:

composer require felixarntz/felixarntz-mu-plugins

Otherwise, you can clone the repository:

git clone https://github.com/felixarntz/felixarntz-mu-plugins.git wp-content/mu-plugins/felixarntz-mu-plugins

Or, if you prefer to go fully manual, you can download a ZIP of the repository and extract it into your wp-content/mu-plugins directory.

After installing the project, you need to copy the wp-content/mu-plugins/felixarntz-mu-plugins/felixarntz-mu-plugins.php file one level up, i.e. to wp-content/mu-plugins/felixarntz-mu-plugins.php. Afterwards, you need to edit your copy of the file, specifically the Loader::FILES_DIR constant, to point to the correct location of the felixarntz-mu-plugins directory containing the individual MU plugin files. You should furthermore edit that file to customize which features you want to load and to configure them (see next section).

Configuration

The project includes a many features, enhancements, and tweaks, some of which are more opinionated than others. You'll most certainly want to customize which features are loaded for your site and how they are configured. You can do so by tweaking your own copy of the loader file wp-content/mu-plugins/felixarntz-mu-plugins.php.

The class in the file contains two arrays that are intended to be modified:

• The indexed array returned by the Loader::files_allowlist() method should contain the list of MU plugin PHP file names (i.e. features) which should be loaded.
• The associative array returned by the Loader::config() method should contain your preferred configuration for the features.

Both methods are initially populated with all the available MU plugin files and configuration variables respectively, so that it's easy to see what is available. Since the arrays are returned by methods, feel free to use simple conditional logic to contextually set different configurations. For example, if you're using this project in a WordPress Multisite, you could return different arrays depending on which site is being accessed (get_site()).

Please see the class's inline documentation for additional information on how to make those modifications.

Updates

To apply updates to the project later, if you use Composer, a simple composer update will do it. Otherwise, you need to update the wp-content/mu-plugins/felixarntz-mu-plugins directory with the latest version, either via git pull from within the directory, or by downloading the latest ZIP and replacing the directory with its contents.

Included features

Each feature is implemented within a single MU plugin file. Note that the features definitely vary in how opinionated there are, so please use and adjust to taste. Even I myself am not using all of these features for every site, so I encourage you to pick and choose what works for you.

The following tables list all features available as part of this project, grouped by what kind of feature it is.

Admin UI enhancements

MU plugin feature	Description	Config variables
Add Admin Color Scheme Branding	Adds an admin color scheme reflecting the site specific brand colors.	admin_color_scheme_base_color admin_color_scheme_icon_color admin_color_scheme_text_color admin_color_scheme_highlight_color admin_color_scheme_accent_color admin_color_scheme_link_color admin_color_scheme_enforced
Add Login Branding	Adds site specific branding to the login page.	login_highlight_color login_highlight_color_hover login_header_image_url login_header_image_size
Clean Plugin Menus	Cleans up top level menu items from plugins in WP Admin.	feedback_menu_title insights_menu_title move_plugin_menus
Fix Tools Menu Capability	Ensures that the Tools menu is only shown if the user has the capabilities to do something with it.
Hide Dashboard	Hides the WordPress dashboard if no additional submenu pages are added to it.	replace_dashboard_startup_screen
Hide Profile Menu	Hides the Profile submenu item and, if applicable, menu item in favor of link in account menu.
Modernize Account Menu Style	Modifies the styling of the account menu in the admin bar to display a larger circled avatar image.
Prevent Custom Menu Order	Forces the custom menu order filter to disabled which tends to be used by plugins to put themselves to the top of the admin menu.
Remove Add New Submenu Links	Removes all the Add New submenu items in the admin.
Remove Dashboard Widgets	Removes all default widgets from the WordPress dashboard.	remove_dashboard_widgets
Simplify Themes Menu	Simplifies the Themes Menu to be purely about editing if the current user cannot switch themes.
Use Content Menu	Moves all post type admin menus into a single Content menu.	indent_content_menu_taxonomies

Block editor modifications

MU plugin feature	Description	Config variables
Add Block Editor Capabilities	Adds dedicated user capabilities for editing block editor features like block colors, typography, or layout.	add_edit_colors_capability add_edit_layout_capability add_edit_typography_capability grant_capabilities_via_edit_theme_options
Disable Block Editor Fullscreen Mode	Disables the block editor's full screen mode by default.
Disable Custom Block Colors Gradients Font Sizes	Disables custom colors, custom gradients, custom font sizes etc. for the block editor to enforce a uniform style.
Modify Allowed Block Types	Modifies the block types allowed in the block editor.	allowed_block_types_all allowed_block_types_{$context} allowed_block_types_post_type_{$post_type} disallowed_block_types_all disallowed_block_types_{$context} disallowed_block_types_post_type_{$post_type}
Modify Block Patterns	Modifies which block patterns are available, also allowing to provide custom block pattern directories.	disable_core_patterns disable_remote_patterns custom_pattern_directories

Disabling core functionality

MU plugin feature	Description	Config variables
Disable Auto Updates	Disables all auto updates.
Disable Comments	Disables comments.
Disable Pages	Disables pages.
Disable Pingbacks	Disables pingbacks and trackbacks.
Disable Post Categories	Disables using and assigning categories for posts (and other post types).
Disable Post Tags	Disables using and assigning tags for posts (and other post types).
Disable Posts	Disables posts.
Disable XML-RPC	Disables XML-RPC access to the site.

Cleanup of wp_head

MU plugin feature	Description	Config variables
Disable Emoji	Removes emoji script and related logic.
Disable Legacy CSS	Removes legacy CSS from certain widgets and shortcodes from wp_head output.
Disable RSS Links	Removes RSS feed links from wp_head output.
Obscure WP Head	Removes useless WordPress indicators from wp_head output.	remove_wp_head_rest_references remove_wp_head_oembed_references

Performance optimization

MU plugin feature	Description	Config variables
Bulk Edit Defer Term Counting	Defers term counting when bulk editing to avoid slow queries for each post updated.
Optimize Last Post Modified	Optimizes the logic to get last post modified to avoid database queries for better performance.
Optimize Meta Table Schema	Optimizes performance of the meta database tables by adding an index to the meta_value field.

Miscellaneous

MU plugin feature	Description	Config variables
Add Client Role	Adds a role for clients with additional capabilities than editors, but not quite admin.	client_role_display_name client_role_additional_caps
Disable Non Production Indexing	Ensures that the site is not indexable in a non-production environment.
Make Site Private	Makes the entire site private so that only logged-in users can see the content.
Modify Allowed MIME Types	Modifies the MIME types allowed for upload in the media library.	allowed_mime_types disallowed_mime_types
Modify REST Root	Modifies the REST API root to a different one, by default using api.	rest_root
Use Ambiguous Login Error	Modifies the error messages for a failed login attempt to be more ambiguous.

Alternative usage

It is recommended that you use the approach from the quick start section above, where you install the project into its own directory within your wp-content/mu-plugins folder, and then copy the felixarntz-mu-plugins.php file from the project one level up. This has multiple benefits:

• You can apply updates the project at any point by simply replacing the directory with its newer version.
• You can customize the configuration via the copied wp-content/mu-plugins/felixarntz-mu-plugins.php file without losing these customizations when you update.
• (Optional) If you use Composer to manage your site's dependencies, you can handle updates automatically by including the project in your composer.json file.

Alternatively, you can put the felixarntz-mu-plugins directory as well as the felixarntz-mu-plugins.php file from the project directly into your wp-content/mu-plugins folder. While this approach still allows you to update and customize, it makes the process a bit more complicated as you have to manually only replace the felixarntz-mu-plugins directory within the project so that you don't overwrite your customizations to the felixarntz-mu-plugins.php file. Last but not least, this approach doesn't work if you want to be able to update the project using Composer. So there are no benefits to this approach.

If you don't want to use the entire project, you could also pick individual files from within the felixarntz-mu-plugins directory, plus the felixarntz-mu-plugins/shared directory, and put them directly into your wp-content/mu-plugins folder. However, this approach is not recommended. While it may seem like a lightweight solution if you only need a few of the features, it really makes maintenance unnecessarily complicated without any benefit, unless you never plan to update those files. The project only loads the files that you want to be loaded anyway, so the mere presence of files with features you don't need doesn't have any notable memory or performance impact.

License

This plugin is free software, and is released under the terms of the GNU General Public License version 2 or (at your option) any later version. See LICENSE for complete license.