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is_admin_bar_showing example

return $button;
}

/** * Prints out the beginning of the admin HTML header. * * @global bool $is_IE */
function _wp_admin_html_begin() {
    global $is_IE;

    $admin_html_class = ( is_admin_bar_showing() ) ? 'wp-toolbar' : '';

    if ( $is_IE ) {
        header( 'X-UA-Compatible: IE=edge' );
    }

    ?> <!DOCTYPE html> <html class="<?php echo $admin_html_class; ?>" <?php     /** * Fires inside the HTML tag in the admin header. * * @since 2.2.0 */

$classes[] = 'tax-' . sanitize_html_class( $term->taxonomy );
                $classes[] = 'term-' . $term_class;
                $classes[] = 'term-' . $term->term_id;
            }
        }
    }

    if ( is_user_logged_in() ) {
        $classes[] = 'logged-in';
    }

    if ( is_admin_bar_showing() ) {
        $classes[] = 'admin-bar';
        $classes[] = 'no-customize-support';
    }

    if ( current_theme_supports( 'custom-background' )
        && ( get_background_color() !== get_theme_support( 'custom-background', 'default-color' ) || get_background_image() ) ) {
        $classes[] = 'custom-background';
    }

    if ( has_custom_logo() ) {
        $classes[] = 'wp-custom-logo';
    }

function _wp_admin_bar_init() {
    global $wp_admin_bar;

    if ( ! is_admin_bar_showing() ) {
        return false;
    }

    /* Load the admin bar class code ready for instantiation */
    require_once ABSPATH . WPINC . '/class-wp-admin-bar.php';

    /* Instantiate the admin bar */

    /** * Filters the admin bar class to instantiate. * * @since 3.1.0 * * @param string $wp_admin_bar_class Admin bar class to use. Default 'WP_Admin_Bar'. */

do_action( 'admin_head' );

if ( 'f' === get_user_setting( 'mfold' ) ) {
    $admin_body_class .= ' folded';
}

if ( ! get_user_setting( 'unfold' ) ) {
    $admin_body_class .= ' auto-fold';
}

if ( is_admin_bar_showing() ) {
    $admin_body_class .= ' admin-bar';
}

if ( is_rtl() ) {
    $admin_body_class .= ' rtl';
}

if ( $current_screen->post_type ) {
    $admin_body_class .= ' post-type-' . $current_screen->post_type;
}