Do you want to put WordPress in maintenance mode while you make some changes to the website without a plugin? You can do so with the following snippet.
// Activate WordPress Maintenance Mode
function activate_maintenance_mode() {
if (!current_user_can('edit_themes') || !is_user_logged_in()) {
wp_die('<h1>Under Maintenance</h1><br />Website under planned maintenance. Please check back later.');
}
}
add_action('get_header', 'activate_maintenance_mode');– LAST TESTED DECEMBER 9, 2019
Code not working? Let us know in the comments below.