(PHP 4 >= 4.0.2, PHP 5 <= 5.0.5, PECL ingres >= 1.0.0)
ingres_close — Close an Ingres database connection
$link
)ingres_close() closes the connection to the Ingres server that is associated with the specified link.
ingres_close() is usually unnecessary, as it will not close persistent connections and all non-persistent connections are automatically closed at the end of the script.
link
The connection link identifier
成功时返回 TRUE， 或者在失败时返回 FALSE.