Description:
------------
The problem is that when safe_mode = On and we have simple script:
<?php
  header('WWW-Authenticate: Basic realm=\"log in\"');
  header('HTTP/1.0 401 Unauthorized');
  exit;
?>
and I get
 3 Server: Apache/2.0.48 (Unix) mod_fastcgi/2.4.2 mod_ssl/2.0.48 OpenSSL/0.9.7c DAV/2
 4 X-Powered-By: PHP/4.3.5RC2
 5 WWW-Authenticate: 1000
which is unknown authentication method for any browser.

According to documentation (http://pl2.php.net/manual/en/features.safe-mode.functions.php) UID should be appended to user specified string.

Tested in on different setups like apache 1.3.29+php 4.3.3, php 4.3.4, apache 2.0.48+php 4.3.5RC2 in fastcgi mode, without fastcgi mode. Always reproducible.

Turning safe_mode = Off fixes problem of course.

Reproduce code:
---------------
See description.

Expected result:
----------------
 3 Server: Apache/2.0.48 (Unix) mod_fastcgi/2.4.2 mod_ssl/2.0.48 OpenSSL/0.9.7c DAV/2
 4 X-Powered-By: PHP/4.3.5RC2
 5 WWW-Authenticate: Basic realm=\"log in\"

+ somehwere UID since that's safe mode.

Actual result:
--------------
 3 Server: Apache/2.0.48 (Unix) mod_fastcgi/2.4.2 mod_ssl/2.0.48 OpenSSL/0.9.7c DAV/2
 4 X-Powered-By: PHP/4.3.5RC2
 5 WWW-Authenticate: 1000