Codeigniter 2.1 - return ids after insert batch

How can I return all IDs after insert_bunch? Function:

public function insert_slike($id, $slike, $folder, $polje, $tabela)
{
        $slike = explode(',', $slike);
        $i = 1;
        $data = array();
        foreach ($slike as $slk) {
            $this->img_upload_resize($slk, $folder);
            $data[] = array(
                $polje => $id,
                'path' => $slk
                );
            $i++;
        }

        $this->db->insert_batch($tabela, $data);
}