BuddyPress.org

This works to remove doubles from a URL:

$string = "http://website.com/blogname/blogname/page/2/";

$string = preg_replace("/([,.?!])/"," \\1",$string);

$parts = explode("/",$string);

$unique = array_unique($parts);

$unique = implode("/",$unique);

$unique = preg_replace("/\s([,.?!])/","\\1",$unique);

echo $unique;

This outputs:

http://website.com/blogname/page/2

Now I have to turn it into a function…