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Here are some more php $_SERVER variables which will give lots of useful information as mentioned below

$_SERVER['PHP_SELF']
This will give the file name of current script being executed, even if its included file it will give its file name.


$_SERVER['GATEWAY_INTERFACE']
Used to get the revision of the CGI specification being used on the serveri.e. 'CGI/1.1'.


$_SERVER['SERVER_ADDR']
Get the IP address of the server on which script is being execute.


$_SERVER['SERVER_NAME']
Get the Host name of server under which script is being executed.

$_SERVER['REMOTE_HOST']
Get the Host name of the visitor.

$_SERVER['REMOTE_PORT']
Get the communication port of the visitor for current communication.

$_SERVER['SERVER_PORT']
Get the communication port of the server for current communication.

$_SERVER['REQUEST_URI']
Get the URI which was entered to access current page (e.g. /contact.php)