get_theme_update_available example

function theme_update_available( $theme ) {
    echo get_theme_update_available( $theme );
}

/** * Retrieves the update link if there is a theme update available. * * Will return a link if there is an update available. * * @since 3.8.0 * * @param WP_Theme $theme WP_Theme object. * @return string|false HTML for the update link, or false if invalid info was passed. */