WordPress at a glance
action is not described

plugins_loaded action-hook . WP 1.5.0

Fires once activated plugins have loaded.

Pluggable functions are also available at this point in the loading order.

Usage

add_action( 'plugins_loaded', 'action_function_name_1157' );
function action_function_name_1157(){
	// action...
}

Where the hook is called

In file: /wp-settings.php
plugins_loaded
wp-settings.php 344
do_action( 'plugins_loaded' );

Where the hook is used (in WP core)

wp-includes/default-filters.php 335
add_action( 'plugins_loaded', 'wp_maybe_load_widgets', 0 );
wp-includes/default-filters.php 336
add_action( 'plugins_loaded', 'wp_maybe_load_embeds', 0 );
wp-includes/default-filters.php 444
add_action( 'plugins_loaded', '_wp_customize_include' );