Custom menu in admin bar

Our plugins may need to add a menu item for pointing to settings page in admin bar.  wp_before_admin_bar_render filter helps us to do that.

if(!function_exists('custom_admin_bar_menu')){
    function custom_admin_bar_menu() {
        global $wp_admin_bar;
            $wp_admin_bar->add_menu( array(
            'id' => 'my_settingspage',
            'title' => __('My settings'),
            'href' => admin_url('/plugingsettingspage.php')
        ) );
    }
}
add_action( 'wp_before_admin_bar_render', 'custom_admin_bar_menu' );


We can also make it as child to existing menu by adding the menu-id as a parent to that menu