(PHP 4 >= 4.0.2, PHP 5 <= 5.0.5, PECL ingres:1.0-1.4.3)
ingres_close — Close an Ingres II database connection
ingres_close() closes the connection to the Ingres server that's associated with the specified link.
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.
The connection link identifier. If not specified, the last opened link is used.
如果成功则返回 TRUE，失败则返回 FALSE。