``` function wp_maintenance_mode() { if (!current_user_can('edit_themes') || !is_user_logged_in()) { wp_die('网站维护中预计开放时间:遥遥无期 没事儿您就别来啦……', 'Maintenance - Could you please not disturb me ', array('response' => '503')); } } add_action('get_header', 'wp_maintenance_mode'); ```