show_admin_bar example

function iframe_header( $title = '', $deprecated = false ) {
    show_admin_bar( false );
    global $hook_suffix, $admin_body_class, $wp_locale;
    $admin_body_class = preg_replace( '/[^a-z0-9_-]+/i', '-', $hook_suffix );

    $current_screen = get_current_screen();

    header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
    _wp_admin_html_begin();
    ?> <title><?php bloginfo( 'name' ); ?> &rsaquo; <?php echo $title; ?> &#8212; <?php _e( 'WordPress' ); ?></title> <?php     wp_enqueue_style( 'colors' );
    

        if ( ! current_user_can( 'customize' ) && ! $this->changeset_post_id() ) {
            $this->wp_die( $this->messenger_channel ? 0 : -1, __( 'Non-existent changeset UUID.' ) );
        }

        if ( ! headers_sent() ) {
            send_origin_headers();
        }

        // Hide the admin bar if we're embedded in the customizer iframe.         if ( $this->messenger_channel ) {
            show_admin_bar( false );
        }

        if ( $this->is_theme_active() ) {
            // Once the theme is loaded, we'll validate it.             add_action( 'after_setup_theme', array( $this, 'after_setup_theme' ) );
        } else {
            /* * If the requested theme is not the active theme and the user doesn't have * the switch_themes cap, bail. */
            if ( ! current_user_can( 'switch_themes' ) ) {