Without the OnOff parameter, this function returns auto-commit status for connection_id. Non-zero is returned if auto-commit is on, 0 if it is off, or FALSE if an error occurs.
If OnOff is TRUE, auto-commit is enabled, if it is FALSE auto-commit is disabled. Returns TRUE on success, FALSE on failure.
By default, auto-commit is on for a connection. Disabling auto-commit is equivalent with starting a transaction.
See also odbc_commit() and odbc_rollback().