WordPress at a glance
action is not described

admin_bar_menu action-hook . WP 3.1.0

Load all necessary admin bar items.

This is the hook used to add, remove, or manipulate admin bar items.

Usage

add_action( 'admin_bar_menu', 'action_function_name_8713' );
function action_function_name_8713( $wp_admin_bar ){
	// action...
}
$wp_admin_bar(WP_Admin_Bar)
WP_Admin_Bar instance, passed by reference

Changelog

Since 3.1.0 Introduced.

Where the hook is called

wp_admin_bar_render()
admin_bar_menu
wp-includes/admin-bar.php 86
do_action_ref_array( 'admin_bar_menu', array( &$wp_admin_bar ) );

Where the hook is used (in WP core)

wp-includes/class-wp-admin-bar.php 596
add_action( 'admin_bar_menu', 'wp_admin_bar_my_account_menu', 0 );
wp-includes/class-wp-admin-bar.php 597
add_action( 'admin_bar_menu', 'wp_admin_bar_search_menu', 4 );
wp-includes/class-wp-admin-bar.php 598
add_action( 'admin_bar_menu', 'wp_admin_bar_my_account_item', 7 );
wp-includes/class-wp-admin-bar.php 599
add_action( 'admin_bar_menu', 'wp_admin_bar_recovery_mode_menu', 8 );
wp-includes/class-wp-admin-bar.php 602
add_action( 'admin_bar_menu', 'wp_admin_bar_sidebar_toggle', 0 );
wp-includes/class-wp-admin-bar.php 603
add_action( 'admin_bar_menu', 'wp_admin_bar_wp_menu', 10 );
wp-includes/class-wp-admin-bar.php 604
add_action( 'admin_bar_menu', 'wp_admin_bar_my_sites_menu', 20 );
wp-includes/class-wp-admin-bar.php 605
add_action( 'admin_bar_menu', 'wp_admin_bar_site_menu', 30 );
wp-includes/class-wp-admin-bar.php 606
add_action( 'admin_bar_menu', 'wp_admin_bar_customize_menu', 40 );
wp-includes/class-wp-admin-bar.php 607
add_action( 'admin_bar_menu', 'wp_admin_bar_updates_menu', 50 );
wp-includes/class-wp-admin-bar.php 611
add_action( 'admin_bar_menu', 'wp_admin_bar_comments_menu', 60 );
wp-includes/class-wp-admin-bar.php 612
add_action( 'admin_bar_menu', 'wp_admin_bar_new_content_menu', 70 );
wp-includes/class-wp-admin-bar.php 614
add_action( 'admin_bar_menu', 'wp_admin_bar_edit_menu', 80 );
wp-includes/class-wp-admin-bar.php 616
add_action( 'admin_bar_menu', 'wp_admin_bar_add_secondary_groups', 200 );