Dibi\Drivers\FirebirdDriver::begin PHP Method

    public function begin($savepoint = NULL)
    {
        if ($savepoint !== NULL) {
            throw new Dibi\NotSupportedException('Savepoints are not supported in Firebird/Interbase.');
        }
        $this->transaction = ibase_trans($this->getResource());
        $this->inTransaction = TRUE;
    }