How to get an array of menu items from the toolbar?

Question

Similar to generating an array of the admin menu/submenu:

global $menu;
foreach ( $menu as $group => $item ) {
    echo '<pre>'; print_r( $item ); echo '</pre>';
}

How can I get an array of all of the available menu items in the toolbar? I tried using the global $wp_admin_bar variable, but that seems to not be the right one.

The reason why I want to generate this array is to use this in a plugin of mine to provide an option to choose which items to hide from the toolbar, allowing users to customize their settings. Right now, I manually created an array called $toolbar to choose the items I want to hide myself:

global $wp_admin_bar;
$toolbar = array(
    'wp-logo', // WordPress logo
    'comments', // Comments
    'new-post', // New > Post
    'search' // Search
    );
foreach ( $toolbar as $item ) {
    $wp_admin_bar -> remove_menu( $item );
}

---

Update [2016-09-16]

I was able to get the entire list by using the following in my plugin settings page:

global $wp_admin_bar;
echo '<pre>'; print_r( $wp_admin_bar ); echo '</pre>';

It's too long to paste in here, so you can view the entire list on this Pastebin link. However, below is a snippet of how it starts. How can I get all of the values that are in [id] => and/or [parent] =>? It looks like I would need to go through a few levels of foreach?

WP_Admin_Bar Object (
    [nodes:WP_Admin_Bar:private] => Array (
            [user-actions] => stdClass Object (
                    [id] => user-actions
                    [title] => 
                    [parent] => my-account
                    [href] => 
                    [meta] => Array (
                            [class] => ab-submenu
                        )

                    [children] => Array (
                            [0] => stdClass Object (
                                    [id] => user-info
                                    [title] => Name
                                    [parent] => user-actions
                                    [href] => http://example.com/wp-admin/profile.php
                                    [meta] => Array (
                                            [tabindex] => -1
                                        )

                                    [children] => Array (
                                        )

                                    [type] => item
                                )

                            [1] => stdClass Object (
                                    [id] => edit-profile
                                    [title] => Edit My Profile
                                    [parent] => user-actions
                                    [href] => http://example.com/wp-admin/profile.php
                                    [meta] => Array (
                                        )

                                    [children] => Array (
                                        )

                                    [type] => item
                                )
and so on...

Answer 1

There is an action hook admin_bar_menu which will provide you an array of admin bar menu items.

add_action('admin_bar_menu', 'get_admin_bar_header_array');

public function get_admin_bar_header_array($admin_bar){

        print_r($admin_bar);

    }

:)

Answer 2

Hook into the action admin_bar_menu, and fetch the menu items with the method get_nodes(), because the item list is private and cannot be accessed directly:

add_action( 'admin_bar_menu', function( \WP_Admin_Bar $wp_admin_bar ) {

    $items = $wp_admin_bar->get_nodes();

    if ( ! $items )
        return;

    print '<pre>';

    foreach ( $items as $id => $item )
    {
        print "$id: " . print_r( $item, TRUE ) . "\n";
    }

    print '</pre>';
}, PHP_INT_MAX );