Renders the admin bar to the page based on the $wp_admin_bar->menu member var.

This is called very early on the {@see ‘wp_body_open’} action so that it will render
before anything else being added to the page body.

For backward compatibility with themes not using the ‘wp_body_open’ action,
the function is also called late on {@see ‘wp_footer’}.

It includes the {@see ‘admin_bar_menu’} action which should be used to hook in and
add new menus to the admin bar. That way you can be sure that you are adding at most
optimal point, right before the admin bar is rendered. This also gives you access to
the `$post` global, among others.

function wp_admin_bar_render() {
	global $wp_admin_bar;
	static $rendered = false;

	if ( $rendered ) {
		return;
	}

	if ( ! is_admin_bar_showing() || ! is_object( $wp_admin_bar ) ) {
		return;
	}

	/**
	 * Loads all necessary admin bar items.
	 *
	 * This is the hook used to add, remove, or manipulate admin bar items.
	 *
	 * @since 3.1.0
	 *
	 * @param WP_Admin_Bar $wp_admin_bar The WP_Admin_Bar instance, passed by reference.
	 */
	do_action_ref_array( 'admin_bar_menu', array( &$wp_admin_bar ) );

	/**
	 * Fires before the admin bar is rendered.
	 *
	 * @since 3.1.0
	 */
	do_action( 'wp_before_admin_bar_render' );

	$wp_admin_bar->render();

	/**
	 * Fires after the admin bar is rendered.
	 *
	 * @since 3.1.0
	 */
	do_action( 'wp_after_admin_bar_render' );

	$rendered = true;
}