WordPress维护模式代码

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');