has_custom_header example

/** * Retrieves the markup for a custom header. * * The container div will always be returned in the Customizer preview. * * @since 4.7.0 * * @return string The markup for a custom header on success. */
function get_custom_header_markup() {
    if ( ! has_custom_header() && ! is_customize_preview() ) {
        return '';
    }

    return sprintf(
        '<div id="wp-custom-header" class="wp-custom-header">%s</div>',
        get_header_image_tag()
    );
}

/** * Prints the markup for a custom header. * * A container div will always be printed in the Customizer preview. * * @since 4.7.0 */