I've been using the following code for setting cookies:

setcookie("name", "value", time()+666, "/", $_SERVER['SERVER_NAME'], 0);

This works on my site but not on my computer.
I recently changed it to

setcookie("name", "value", time()+666, "/", "", 0);

and it works. I've tested it on Xitami and Apache 1.3.77.
Any comments?

what's the value of $_SERVER['SERVER_NAME'] on your computer?

localhost

I tried "http://localhost" and it still doesn't work.

"localhost" is not technically a domain name. Hence, it will not work As It Should(tm).

Try adding "localhost.localdomain" into your HOSTS file and using "localhost.localdomain" as the domain parameter to setcookie().

where's the HOSTS file?

On Windows, in %windir%\system32\drivers\etc

IIRC.

i would use this one istead:

setcookie("name", "value", time()+666, "/", ($_SERVER['SERVER_NAME']=="localhost")?"":$_SERVER['SERVER_NAME']), 0);