(PHP 5, PHP 7 < 7.4.0)
ibase_close — Close a connection to an InterBase database
ibase_close ([ resource $connection_id = null ] ) : bool
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.
connection_id
An InterBase link identifier returned from ibase_connect(). If omitted, the last opened link is assumed.
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.ibase-close.php