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Which element contains the name of the server? which is usually the same as the domain name of the site on the server.
$_SERVER['DOCUMENT_ROOT']
$_SERVER['HTTP_HOST']
$_SERVER['REMOTE_HOST']
$_SERVER['REMOTE_ADDR']
Explanation
The HTTP_HOST is obtained from the HTTP request header and this is what the client actually used as "target host" of the request. The SERVER_NAME is defined in server config.
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