You probably have an external auth module operating on the same request.
On Sat, 19 Oct 2002, Martin Jansen wrote:
> The following script fails with the todays snapshot and with PHP
> 4.3.0-pre1:
>
> <?php
> if (!isset($PHP_AUTH_USER)) {
> header("WWW-Authenticate: Basic realm=\"Foobar\"");
> header("HTTP/1.0 401 Unauthorized");
> echo "Access denied.";
> exit;
> } else {
> echo "Hello";
> }
> ?>
>
> I looks like $PHP_AUTH_(USER|PW) are not set
> properly. Register_globals is set to on, but the same problem also
> occurs when setting it to off and using $_SERVER['PHP_AUTH_USER']
> then. (Apache 1.3.26, Linux)
>
> Any clues?
>
> --
> - Martin Martin Jansen
> http://martinjansen.com/
>
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