Notice: Undefined index: REMOTE_HOST

[carlostefano]

Ho provato a scrivere questa riga di codice:

$str_host_ip = ($_SERVER['REMOTE_HOST'] == "") ? $_SERVER['REMOTE_ADDR'] : $_SERVER['REMOTE_HOST'];

però nella pagina compare:

Notice: Undefined index: REMOTE_HOST

dov'è il problema?

Saluti,
carlostefano

[DydBoy]

Quoto da PHP.net sulle variabili $_SERVER

'REMOTE_HOST'

The Host name from which the user is viewing the current page. The reverse dns lookup is based off the REMOTE_ADDR of the user.

Note: Your web server must be configured to create this variable. For example in Apache you'll need HostnameLookups On inside httpd.conf for it to exist. See also gethostbyaddr().