<?php
$server_domain = $_SERVER['HTTP_HOST'];
// Remove www. if present
$server_domain = preg_replace('/^www\./', '', $server_domain);
header("Content-Type: text/plain");
?>
User-agent: *
Allow: /
Disallow: /form-handler.php

# Google-specific directives
User-agent: Googlebot
Allow: /
Disallow: /form-handler.php

User-agent: Googlebot-Image
Allow: /img/

# Sitemap
Sitemap: https://<?php echo $server_domain; ?>/sitemap.xml