$_SERVER["SCRIPT_URI"] not working? alternative?

If you need domain name, use:

$_SERVER['HTTP_HOST']

When in doubt

var_dump($_SERVER);

Depending on what you want, I'd use one of the following:

1. $_SERVER['PHP_SELF'] for the script file location
2. $_SERVER['SERVER_NAME'] for the host name

From the php docs

EDIT: Maybe PHP_SELF isn't the best. See comments.