Returns TRUE on success, or FALSE on failure.
ingres_close() closes the connection to
the Ingres server that's associated with the specified link.
If the link
parameter isn't
specified, the last opened link is used.
ingres_close() isn't usually necessary, as it won't close persistent connections and all non-persistent connections are automatically closed at the end of the script.
See also ingres_connect() and ingres_pconnect().