PDF data displayed but file not downloaded - php

Question

I want to preview and download an order invoice pdf using this code :
public function generatePDFByIdOrder()
{
$order = new Order(1); //I want to download the invoice PDF of $order_id '1'
if (!Validate::isLoadedObject($order)) {
throw new PrestaShopException('Can\'t load Order object');
}
$order_invoice_collection = $order->getInvoicesCollection();
$this->generatePDF($order_invoice_collection, PDF::TEMPLATE_DELIVERY_SLIP);
}
public function generatePDF($object, $template)
{
$pdf = new PDF($object, $template, Context::getContext()->smarty);
$pdf->render();
}
And calling it with the following code :
$order = new order();
echo $order->generatePDFByIdOrder();
I have the pdf's data printed on the browser console but not downloaded .
How can I manipulate that data to download a pdf file ?

Answer 1

PrestaShop use TCPDF.
Edit generatePDF in this way:
public function generatePDF($object, $template)
{
$pdf = new PDF($object, $template, Context::getContext()->smarty);
$pdf->Output('name.pdf', 'I');
}

Answer 2

I guess you only have to set the proper headers before rendering the PDF with TCPDF like so :
header("Content-type:application/pdf");
But "downloading" a PDF will depend on what the user's browser settings. It might download them (in which case you'd have to set another header called Content-Disposition:attachment) or display it inside the browser.

Answer 3

We recommend you, to create a separate controller to render the PDF file and to always open that controller in a new tab. It will help you to have separate logic using DOMPDF library.
Invoice controller will be as follows (invoice.php)
include_once(_PS_MODULE_DIR_.'supercehckout/libraries/dompdf/dompdf_config.inc.php');
class SuperCheckoutInvoiceModuleFrontController extends ModuleFrontController
{
public function initContent()
{
parent::initContent();
$this->generateInvoice(ORDER_ID);
}
}
Note: SuperCheckout is the example module name.
generateInvoice() function will be as follows:
function generateInvoice($order_id)
{
$dompdf = new DOMPDF();
$html = utf8_decode(INVOICE_HTML);
$dompdf->load_html(INVOICE_HTML);
$dompdf->render();
}