mPDF Download

public function downloadpdf()
{
    $pak_id = $this->uri->segment(3);
    $data['detail'] = $this->pak_model->select_by_pak($pak_id)->row();

    $time = time();
    $filename = 'CetakPAK_'.$pak_id.'_'.$time;
    $pdfFilePath = FCPATH."/download/$filename.pdf";

    if (file_exists($pdfFilePath) == FALSE){
        ini_set('memory_limit','50M');
        $html = $this->load->view('printpdf_view', $data, true);

        $this->load->library('pdf');
        $pdf = $this->pdf->load();
        $pdf->SetHeader('');
        $pdf->SetFooter('');
        $pdf->WriteHTML($html);
        $pdf->Output($pdfFilePath, 'F');
    }
    redirect("/download/$filename.pdf");
}