(PHP 4, PHP 5)
ibase_close — Close a connection to an InterBase database
Closes the link to an InterBase database that's associated with a connection id returned from ibase_connect(). Default transaction on link is committed, other transactions are rolled back.
An InterBase link identifier returned from ibase_connect(). If omitted, the last opened link is assumed.
成功时返回 TRUE， 或者在失败时返回 FALSE.