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Сниппет [[host]]

echo $_SERVER['HTTP_HOST'];

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Код на страничке robots.txt

User-agent: *
Disallow: /manager/
Disallow: /assets/components/
Disallow: /core/
Disallow: /connectors/
Disallow: /index.php
Disallow: *?
Host: [[host]]
Sitemap: http://[[host]]/sitemap.xml