function custom_wordpress_maintenance_mode() { // Check if the user is not logged in OR cannot manage options (is not an admin) if ( ! current_user_can( 'manage_options' ) || ! is_user_logged_in() ) { // Return a 503 Service Unavailable header so search engines don't index the maintenance page wp_status_header( 503 ); header( 'Retry-After: 3600' ); // Advises search engines to try again in 1 hour // Custom HTML/CSS layout for the maintenance screen $message = ' Site Under Maintenance

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'; wp_die( $message, 'Site Under Maintenance' ); } } // Using template_redirect fires early and safely blocks front-end pages add_action( 'template_redirect', 'custom_wordpress_maintenance_mode' );