Controller

public function cetak($id_dko) {
        $id_dko = $this->uri->segment(4);
        $data['dko'] = $this->dko_model->select_by_id2($id_dko)->row();
        $data['daftar_detail'] = $this->dko_model->select_detail_all($id_dko)->result();

        $pdfFilePath = "C:\\downloads/reports/$filename.pdf";
        if (file_exists($pdfFilePath) == FALSE){
            ini_set('memory_limit','32M');
            $html = $this->load->view('adm/r_print_dko', $data, true); // render the view into HTML

            $this->load->library('pdf');
            $pdf = $this->pdf->load();
            $pdf->SetFooter($_SERVER['HTTP_HOST'].'|{PAGENO}|'.date(DATE_RFC822));
            $pdf->WriteHTML($html); // write the HTML into the PDF
            $pdf->Output($pdfFilePath, 'F'); // save to file because we can
        }
        redirect("C:\\downloads\reports\$filename.pdf");

        //$this->load->view('adm/r_print_dko', $data);
    }