How to switch a php variable according to the server address

I managed to switch my websites links (containing a php variable: $root) according to the server address. If they are in localhost the variable begins with: http://localhost , if they are on remote the variable is the remote address.

The php code is quite simple:

if ($_SERVER['SERVER_NAME'] == "localhost")
{$root_yourwebsiteA = "http://localhost/your path/yourwebsiteA/";
 $root_yourwebsiteB = "http://localhost/your path/yourwebsiteB/";
 $root_yourwebsiteC = "http://localhost/your path/yourwebsiteC/";
}
else 
{$root_yourwebsiteA = "http://remote path/yourwebsiteA/";
 $root_yourwebsiteB = "http://remote path/yourwebsiteB/";
 $root_yourwebsiteC = "http://remote path/yourwebsiteC/";
}

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