How to enable mu-plugins?

@tara

The codex specifies the path to be /wp-content/mu-plugins/

Mark Jaquith’s WordPress Skeleton project has a similar structure as does Ben Word’s Roots Soil so the structure would seem to be correct.

My load.php file shows up in the list at WP Admin > Plugin > Must-Use. So that must mean the issue lies in the path to the individual plugins.

The loader file inside mu-plugins looks like this:

<?php
/*
Plugin Name:  Must Use Plugins Loader
Plugin URI:   http://somewhere.org/
Description:  Making sure this works!
Version:      1.0
Author:       Me
Author URI:   http://somewhere.org/
*/

require WPMU_PLUGIN_DIR . '/my-plugin/my-plugin.php';
require WPMU_PLUGIN_DIR . '/advanced-custom-fields/acf.php';
require WPMU_PLUGIN_DIR . '/wp-post-formats/cf-post-formats.php';

Since I am using WordPress Skeleton I’ve had to define the mu-plugins folder in the wp-config.php like so:

// ========================
// Custom Content Directory
// ========================
define( 'WP_CONTENT_DIR', dirname( __FILE__ ) . '/content' );
define( 'WP_CONTENT_URL', 'http://' . $_SERVER['HTTP_HOST'] . '/content' );

// ========================
// Custom MU Plugins Directory
// ========================
define( 'WPMU_PLUGIN_DIR', dirname( __FILE__ ) . '/content/mu-plugins' );

If I try to change these paths, either in the wp-config.php or my load.php the page won’t load so it would seem the addressing is correct.

OK, I misunderstood something about the mu-plugins folder. If your mu-plugins are in subfolders, like typical plugins (/mu-plugins/my-plugin/my-plugin.php), you will not see them listed in the WP admin. However, that does not mean they haven’t loaded.