Using WordPress ‘muplugins_loaded’ PHP action

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The muplugins_loaded WordPress PHP action fires once all must-use and network-activated plugins have loaded.

Usage

add_action('muplugins_loaded', 'your_custom_function');
function your_custom_function() {
// your custom code here
}

Parameters

  • None

More information

See WordPress Developer Resources: muplugins_loaded

Examples

Register a Custom Post Type

Register a custom post type after all must-use plugins are loaded.

add_action('muplugins_loaded', 'register_custom_post_type');

function register_custom_post_type() {
    // Register a custom post type called "book"
    register_post_type('book', array(
        'public' => true,
        'label' => 'Books'
    ));
}

Load a Custom PHP File

Load a custom PHP file from the mu-plugins directory.

add_action('muplugins_loaded', 'load_custom_php_file');

function load_custom_php_file() {
    // Load a custom PHP file
    require_once(WPMU_PLUGIN_DIR . '/custom-file.php');
}

Enqueue a Custom Script

Enqueue a custom script file after all must-use plugins are loaded.

add_action('muplugins_loaded', 'enqueue_custom_script');

function enqueue_custom_script() {
    // Enqueue a custom script file
    wp_enqueue_script('custom-script', WPMU_PLUGIN_URL . '/custom-script.js', array('jquery'), '1.0.0', true);
}

Initialize a Custom Class

Initialize a custom class after all must-use plugins are loaded.

add_action('muplugins_loaded', 'initialize_custom_class');

function initialize_custom_class() {
    // Initialize a custom class
    $custom_class = new Custom_Class();
}

Register Custom Taxonomy

Register a custom taxonomy for a custom post type after all must-use plugins are loaded.

add_action('muplugins_loaded', 'register_custom_taxonomy');

function register_custom_taxonomy() {
    // Register a custom taxonomy called "genre" for "book" post type
    register_taxonomy('genre', 'book', array(
        'label' => 'Genres',
        'rewrite' => array('slug' => 'genre'),
        'hierarchical' => true,
    ));
}