WordPress at a glance
action is not described

admin_menu action-hook . WP 1.5.0

Fires before the administration menu loads in the admin.

Usage

add_action( 'admin_menu', 'action_function_name_9180' );
function action_function_name_9180( $context ){
	// action...
}
$context(string)
Empty context.

Where the hook is called

In file: /wp-admin/includes/menu.php
admin_menu
wp-admin/includes/menu.php 149
do_action( 'admin_menu', '' );

Where the hook is used (in WP core)

wp-includes/default-filters.php 461
add_action( 'admin_menu', '_add_post_type_submenus' );
wp-includes/theme.php 2582
remove_action( 'admin_menu', array( $GLOBALS['custom_image_header'], 'init' ) );
wp-includes/theme.php 2592
remove_action( 'admin_menu', array( $GLOBALS['custom_background'], 'init' ) );
wp-admin/includes/admin-filters.php 49
add_action( 'admin_menu', '_wp_privacy_hook_requests_page' );
wp-admin/custom-background.php 51
add_action( 'admin_menu', array( $this, 'init' ) );
wp-admin/menu.php 186
add_action('admin_menu', '_add_themes_utility_last', 101);
wp-admin/custom-header.php 59
add_action( 'admin_menu', array( $this, 'init' ) );