PHP_AUTH_USER not set?

There is a ‘sensible way’ to use HTTP Basic Auth in CGI-mode PHP: in the .htaccess use

RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

and in the PHP use

list($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']) = 
  explode(':', base64_decode(substr($_SERVER['HTTP_AUTHORIZATION'], 6)));

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