why getenv('remote_addr') giving me vacant ip address?


this php code...



207    (getenv(http_x_forwarded_for)) {
208        $ip   = getenv('http_x_forward_for');
209        $host = gethostbyaddr($ip);
210    } else {
211        $ip   = getenv('remote_addr');
212        $host = gethostbyaddr($ip);
213    }


throws warning...




warning: gethostbyaddr()
[function.gethostbyaddr]: castle is
a.b.c.d form c:\inetpub...\filename.php line 212




it seems $ip blank.



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