URL character bug?

[eluser]WanWizard[/eluser]
Encoding it using % 23 doesn't help, the webserver will decode it and strip it again.

You might try a urlencode(html_entitities($var)), but that will only work for URL's you craft yourself. There are some discussings about trying to handle this with mod_rewrite, but as far as I can see the # part of the URL is already stripped when it is passed to mod_rewrite.