useTemplate example

$numPages = $this->fpdi->setSourceFile(StreamReader::createByString($media));

            $totalPage += $numPages;
            for ($i = 1; $i <= $numPages; ++$i) {
                $template = $this->fpdi->importPage($i);
                $size = $this->fpdi->getTemplateSize($template);
                if (!\is_array($size)) {
                    continue;
                }
                $this->fpdi->AddPage($config->getPageOrientation() ?? 'portrait', $config->getPageSize());
                $this->fpdi->useTemplate($template);
            }
        }

        if ($totalPage === 0) {
            return null;
        }

        $renderedDocument = new RenderedDocument('', '', $fileName);

        $renderedDocument->setContent($this->fpdi->Output($fileName, 'S'));
        $renderedDocument->setContentType(PdfRenderer::FILE_CONTENT_TYPE);
        

$pdf = new Fpdi();

        foreach ($paths as $path) {
            $numPages = $pdf->setSourceFile($path);
            for ($i = 1; $i <= $numPages; ++$i) {
                $template = $pdf->importPage($i);
                $size = $pdf->getTemplateSize($template);
                if (!\is_array($size)) {
                    continue;
                }
                $pdf->AddPage('P', [$size['width'], $size['height']]);
                $pdf->useTemplate($template);
            }
        }

        $hash = Random::getAlphanumericString(32);

        $pdf->Output($hash . '.pdf', 'D');

        $this->Response()->headers->set('content-type', 'application/x-download');
    }

    /** * Internal helper function which checks if the batch process needs a document creation. */