#[AllowDynamicProperties]
class WP_Admin_Bar {
    private $nodes = array();
    private $bound = false;
    public $user;
    public $menu = array(); // Deprecated since 3.3.0
}

private $nodes = array();

private $bound = false;

public $user;

public $menu = array();

public function initialize(): void

// Called automatically by _wp_admin_bar_init()
$wp_admin_bar->initialize();

public function add_menus(): void

public function add_node( array $args ): void

$wp_admin_bar->add_node( array(
    'id'     => 'my-plugin',
    'title'  => '<span class="ab-icon dashicons-admin-plugins"></span> My Plugin',
    'href'   => admin_url( 'plugins.php' ),
    'parent' => 'top-secondary',
    'meta'   => array(
        'class' => 'my-plugin-node',
        'title' => 'Manage My Plugin',
    ),
) );

public function add_menu( array $node ): void

final public function add_group( array $args ): void

$wp_admin_bar->add_group( array(
    'id'     => 'my-plugin-actions',
    'parent' => 'my-plugin',
    'meta'   => array(
        'class' => 'ab-sub-secondary',
    ),
) );

// Add items to the group
$wp_admin_bar->add_node( array(
    'parent' => 'my-plugin-actions',
    'id'     => 'action-one',
    'title'  => 'Action One',
    'href'   => '#',
) );

public function remove_node( string $id ): void

// Remove WordPress logo
$wp_admin_bar->remove_node( 'wp-logo' );

// Remove updates notification
$wp_admin_bar->remove_node( 'updates' );

// Remove search
$wp_admin_bar->remove_node( 'search' );

public function remove_menu( string $id ): void

final public function get_node( string $id ): object|void

$node = $wp_admin_bar->get_node( 'site-name' );
if ( $node ) {
    echo $node->title;
    echo $node->href;
}

final public function get_nodes(): array|void

$nodes = $wp_admin_bar->get_nodes();
foreach ( $nodes as $node ) {
    error_log( 'Node: ' . $node->id );
}

public function render(): void

<div id="wpadminbar" class="nojq nojs">
    <a class="screen-reader-shortcut" href="#wp-toolbar">Skip to toolbar</a>
    <div class="quicklinks" id="wp-toolbar" role="navigation" aria-label="Toolbar">
        <!-- Menu groups and items -->
    </div>
</div>

public function recursive_render( string $id, object $node ): void

final protected function _set_node( array $args ): void

final protected function _get_node( string $id ): object|void

final protected function _get_nodes(): array|void

final protected function _unset_node( string $id ): void

final protected function _bind(): object|void

final protected function _render( object $root ): void

final protected function _render_container( object $node ): void

<div id="wp-admin-bar-{container-id}" class="ab-group-container">
    <!-- Nested groups -->
</div>

final protected function _render_group( object $node, string|bool $menu_title = false ): void

<ul role="menu" id="wp-admin-bar-{group-id}" class="{classes}" aria-label="{menu_title}">
    <!-- Child items -->
</ul>

final protected function _render_item( object $node ): void

<li role="group" id="wp-admin-bar-{item-id}" class="menupop {classes}">
    <a class="ab-item" role="menuitem" href="{url}" aria-expanded="false">
        <span class="wp-admin-bar-arrow" aria-hidden="true"></span>
        {title}
    </a>
    <div class="ab-sub-wrapper">
        <!-- Child groups -->
    </div>
    {meta.html}
</li>

<li role="group" id="wp-admin-bar-{item-id}">
    <div class="ab-item ab-empty-item" role="menuitem">
        {title}
    </div>
</li>

add_filter( 'wp_admin_bar_class', 'my_custom_admin_bar_class' );

function my_custom_admin_bar_class( $class ) {
    return 'My_Custom_Admin_Bar';
}

class My_Custom_Admin_Bar extends WP_Admin_Bar {
    
    public function render() {
        // Custom rendering logic
        parent::render();
    }
    
    public function add_node( $args ) {
        // Modify all nodes before adding
        $args['title'] = '🚀 ' . $args['title'];
        parent::add_node( $args );
    }
}

$wp_admin_bar->add_node( array(
    'id'    => 'my-item',
    'title' => '<span class="ab-icon dashicons-admin-settings"></span>' .
               '<span class="ab-label">Settings</span>',
    'href'  => admin_url( 'options.php' ),
) );

$wp_admin_bar->add_group( array(
    'parent' => 'my-menu',
    'id'     => 'my-menu-secondary',
    'meta'   => array(
        'class' => 'ab-sub-secondary', // Adds visual separator
    ),
) );

if ( current_user_can( 'manage_options' ) ) {
    $wp_admin_bar->add_node( array(
        'id'    => 'admin-only-item',
        'title' => 'Admin Only',
        'href'  => admin_url(),
    ) );
}

$wp_admin_bar->add_node( array(
    'id'    => 'custom-html',
    'title' => 'Custom',
    'meta'  => array(
        'html' => '<div class="my-custom-popup">
                      <p>Custom content here</p>
                   </div>',
    ),
) );