mu-plugins aren’t loading

The reason plugins in the mu-plugins folder can’t be activated in the plugins page is because that’s not how mu-plugins works. The mu stands for must use.

Improtant things to know:

  • mu-plugins load before plugins
  • WP loads PHP files in the mu-plugins folder
    • it does not search subfolders
    • it does not look for plugin headers
  • PHP files in the mu-plugins folder have no activation status, they are always loaded.
    • this is true for all sites in a multisite, there is no conditional loading.

So code in the mu-plugins folder will never have an activate/deactivate link. You can never put code in both mu-plugins and plugins. You also can’t just put a plugin in mu-plugins, it needs a PHP file that includes the plugins main file to work.

mu-plugins is a folder of PHP files, where WP loads all the PHP files before it loads the plugins or themes.

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