Description:
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In the Digest Authentication example on this page:

<http://ca3.php.net/manual/en/features.http-auth.php>

The regular expression used for splitting the auth header is missing at least one character. The script will fail if a url contains a question mark '?'. A fix is to change the preg_match_all line to be:

preg_match_all('@(\w+)=([\'"]?)([a-zA-Z0-9?=./\_-]+)\2@', $txt, $matches, PREG_SET_ORDER);

Reproduce code:
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see <http://ca3.php.net/manual/en/features.http-auth.php>, digest auth example. copy & paste that code into a new file, then try to reach it with something like (example URL):

http://<your web server>/<file>.php?some=parameter

Expected result:
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I expect the example URL above to authenticate as usual.

Actual result:
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It will never authenticate, because the http_digest_parse() function returns false after failing to catch the "uri" parameter from the browser response.