Description:
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When a URI includes a fragment, that fragment is not captured as part of the $_SERVER['REQUEST_URI'] variable, so it is not possible to use parse_url() to get the fragment.  As an example,  the following request will NOT have the fragment in the $_SERVER['REQUEST_URI'] variable:
http://www.freephile.com/admin/test.php?foo=bar#fragment

Instead, the $_SERVER['REQUEST_URI'] is given as '/admin/test.php?foo=bar'

I use PHP to process outgoing site links on http://www.buzgate.org, but due to this problem, I cannot redirect to external URIs containing a fragment.  The workaround is to recode those URIs into two querystring variables and then reconstruct the URI: to=http://somewhere.com/somepage.html&fragment=named_anchor

$externalSiteURI = $_REQUEST['to'] . $_REQUEST['fragment'];

Reproduce code:
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See
http://www.freephile.com/admin/test.php?foo=bar#fragment

and 
http://buzgate.org/referral.php?to=http://www.sba.gov/library/pubs.html#success4
(this link may be fixed with a workaround by the time you get this message)

Expected result:
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$_SERVER['REQUEST_URI'] = '/admin/test.php?foo=bar#fragment'

Actual result:
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$_SERVER['REQUEST_URI'] = '/admin/test.php?foo=bar'