add_action('get_header', 'wp_completely_blank_maintenance');
function wp_completely_blank_maintenance() {
// Allows logged-in administrators to view the site normally
if (!current_user_can('edit_themes') || !is_user_logged_in()) {
// Send a 503 Service Unavailable status so search engines know it is temporary
status_header(503);
header('Retry-After: 3600'); // Tells bots to try again in 1 hour
// Output a completely blank HTML page and stop execution
echo '';
exit;
}
}
