Description
bool 
imap_renamemailbox ( resource imap_stream, string old_mbox, string new_mbox )
 
     This function renames on old mailbox to new mailbox (see
     imap_open() for the format of
     mbox names).
    
    Returns TRUE on success or FALSE on failure.
   
     See also imap_createmailbox(),
     imap_deletemailbox(), and
     imap_open() for the format of
     mbox.