bool ibase_rollback_ret    ([ resource $link_or_trans_identifier = NULL  ] )

ibase_rollback_retRoll back a transaction without closing it

link_or_trans_identifier

If called without an argument, this function rolls back the default transaction of the default link. If the argument is a connection identifier, the default transaction of the corresponding connection will be rolled back. If the argument is a transaction identifier, the corresponding transaction will be rolled back. The transaction context will be retained, so statements executed from within this transaction will not be invalidated.