whoami source code

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if (getenv("HTTP_CLIENT_IP")){   
  $ip = getenv("HTTP_CLIENT_IP");   
}   
elseif(getenv("HTTP_X_FORWARDED_FOR")) {   
  $ip = getenv("HTTP_X_FORWARDED_FOR");   
}   
elseif(getenv("REMOTE_ADDR")){   
  $ip = getenv("REMOTE_ADDR");   
}   
else {   
  $ip = "UNKNOWN"; 
} 
$fullhost = gethostbyaddr($ip);
$browser = $_SERVER['HTTP_USER_AGENT']; 
$page = $_SERVER['PHP_SELF'];

print("You are $fullhost ($ip)");
print("and you are using $browser to visit $page");

A more useful application of this is of course logging if you for some reason do not have direct access to /var/log/httpd/access_log (or equivalent).

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