createByString example

foreach ($documents as $document) {
            $documentMediaId = $this->ensureDocumentMediaFileGenerated($document, $context);

            if ($documentMediaId === null) {
                continue;
            }

            $config = DocumentConfigurationFactory::createConfiguration($document->getConfig());

            $media = $context->scope(Context::SYSTEM_SCOPE, fn (Context $context): string => $this->mediaService->loadFileStream($documentMediaId, $context)->getContents());

            $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);
            }
        }