(PHP 4, PHP 5)
imap_renamemailbox — Rename an old mailbox to new mailbox
$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).
  
imap_stream由 imap_open() 返回的 IMAP 流。
old_mbox
     The old mailbox name, see imap_open() for more information
new_mbox
     The new mailbox name, see imap_open() for more information
   成功时返回 TRUE, 或者在失败时返回 FALSE。