sybase_close() closes the link to
a Sybase database that's associated with the specified link
link_identifier. If the
link identifier isn't specified, the last opened link is
assumed.
成功回傳TRUE失敗回傳FALSE。
Note that this isn't usually necessary, as non-persistent
open links are automatically closed at the end of the
script's execution.
sybase_close() will not close
persistent links generated by
sybase_pconnect().
See also: sybase_connect(),
sybase_pconnect().