REMOTE_HOST doesn't work!

[Anon]

While sending form-data to an email adress I would also like to know the remote host of the person that filled in my form.
So I programmed something like:
$email_body .= 'Remote Host: '.$REMOTE_HOST.'\n';

But it seems that $REMOTE_HOST is not known because it returns an empty string.
(By the way: I also didn't see any remote host variable in the php_info() function).

Does this mean my ISP doesn't support this env. variable? Is there another way to get this information?

[kparker]

Are you confusing with with $REMOTE_ADDR? This should work in all cases.

[Anon]

No. The REMOTE_ADDR just returns a (port?) number while REMOTE_HOST should return something like "proxy3-in.worldonline.nl".

[[deleted]]

REMOTE_ADDR returns the server's IP.
Some IP's can't be resolved and thus give an empty string.
Try
echo '<pre>';
print_r(HTTP_SERVER_VARS);
echo '</pre>';

and see what you have.

[maxholman]

Some web servers do not resolve a clients IP address into a host name, as it creates a delay serving up a web page.

If you wish to resolve the IP in REMOTE_ADDR, you can use gethostbyaddr($ip_address)

Though, this may add a delay into your PHP script, while the server tries to resolve the address.

Max