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    composer require kristianlentino/watermark-fpdf

Permette di creare facilmente un watermark in un file PDF. Esempio:

       use Kristianlentino\WatermarkFpdf\WatermarkFpdi;
       $fpdi = new WatermarkFpdi();
   	$pdfPath = __DIR__. DIRECTORY_SEPARATOR.'..'.DIRECTORY_SEPARATOR.'../media/lf_ebooks/1634655065/file.pdf';
   	$pdfPathSave = __DIR__. DIRECTORY_SEPARATOR.'..'.DIRECTORY_SEPARATOR.'../media/lf_ebooks/1634655065/file_prova.pdf';
   	$pageCount = $fpdi->setSourceFile($pdfPath);
   	for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {

   		// import a page
   		$templateId = $fpdi->importPage($pageNo);
   		$size = $fpdi->getTemplateSize($templateId);
   		//set the new page to the size of the template
   		$fpdi->AddPage('',[$size['width'],$size['height']]);

   		//the last parameter will adjust the size of the page
   		$fpdi->useTemplate($templateId, 0, 0, null, null, true);

   		// set alpha to semi-transparency
   		$fpdi->SetAlpha(0.5);
   		$fpdi->SetFont('Arial','B',80);
   		$fpdi->SetTextColor(188,190,190);
   		$fpdi->RotatedText(50,180,'Lavorofacile',45);
   		// set alpha to semi-transparency
   		$fpdi->SetAlpha(1);
   	}

       /* 
           I --> mostra il file nel browser,
           D --> Download file 
           F --> Salva il file in locale 
           S --> Ritorna il file come stringa 
       */
   	return $fpdi->Output($pdfPathSave,'I');

Queste funzioni sono state prese dai seguenti link:

kristianlentino / watermark-fpdf

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