If you're dealing with files uploaded through some external FTP source and need to move them to a final destination, searching php.net for "mv" or "move" won't get you what you want. You want the rename() function.
http://www.php.net/manual/en/function.rename.php
(move_uploaded_file() won't work, since the POST vars won't be present.)