This function reopens the specified stream to a new
mailbox on an IMAP or NNTP server.
The options are a bit mask with one or more of the
following:
OP_ANONYMOUS - Dont use or update a .newsrc for news (NNTP only)
OP_HALFOPEN - For IMAP and NNTP names, open a
connection but dont open a mailbox.
CL_EXPUNGE - Expunge mailbox automatically upon
mailbox close (see also
imap_delete() and
imap_expunge())
Returns TRUE on success
and FALSE on error.