I'm about to pull my hair out trying to figure this out.
I'm using Mac OS X and have PHP and MySQL installed on my system.
$_SERVER[PHP_AUTH_USER] returns no value.
When I look at phpinfo() I see that many other $SERVER values are listed, but $SERVER[PHP_AUTH_USER] is not one of them.
Any help would be greatly appreciated!
(and yes, I've searched high and low and cannot find anything!)