public function exportPdf() {
        $pdf = new FPDF('l','mm','A5');
        // membuat halaman baru
        $pdf->AddPage();
        // setting jenis font yang akan digunakan
        $pdf->SetFont('Arial','B',16);
        // Memberikan space kebawah agar tidak terlalu rapat
        $pdf->Cell(10,7,'',0,1);
        $pdf->SetFont('Arial','B',10, true);
        $pdf->Cell(85,6,'Nama Item',1,0, true);
        $pdf->Cell(40,6,'Harga Item',1,0, true);
        $pdf->Cell(65,6,'Deskripsi Item',1,1, true);
        $pdf->SetFont('Arial','',10);
        $pdf->Cell(10,0,'',0,1);
        $height_cell = 6;
        $data = $this->product_model->getAll();
        for($position = 0; $position < sizeof($data); $position++) {
            $product = $data[$position];
            $pdf->Cell(85,$height_cell,$product->name,1,0);
            $pdf->Cell(40,$height_cell,$product->price,1,0);
            $pdf->MultiCell(65,$height_cell,$product->description,1,1);
        }
        $pdf->Output();
    }

    public function exportXls() {
        $data = $this->product_model->getAll();
		$spreadsheet = new SpreadSheet();
		$sheet = $spreadsheet->getActiveSheet();
		$sheet->setCellValue('A1', 'Nama Item');
		$sheet->setCellValue('B1', 'Harga Item');
		$sheet->setCellValue('C1', 'Deskripsi Item');
        $rowCount = 2;
        for($position = 0; $position < sizeof($data); $position++) {
            $product = $data[$position];
            $sheet->setCellValue('A' . $rowCount, $product->name);
            $sheet->setCellValue('B' . $rowCount, $product->price);
            $sheet->setCellValue('C' . $rowCount, $product->description);
            $rowCount++;
        }

		$writer = new Xlsx($spreadsheet);
		$filename = 'products.xlsx';

		$this->output->set_header('Content-Type: application/vnd.ms-excel');
		$this->output->set_header("Content-type: application/csv");
		$this->output->set_header('Cache-Control: max-age=0');
		$writer->save($filename);
		//redirect(HTTP_UPLOAD_PATH.$fileName);
        $filepath = realpath($filename);
        if(file_exists($filepath)) {
            // force_download($filename, $filepath);
            header('Content-Type: application/vnd.ms-excel');
            header('Content-Type: application/csv');
            header('Content-Disposition: attachment; filename="'.basename($filepath).'"');
            flush();
            readfile($filepath);
        }
	}