افزودن امضای دیجیتال به PDF از طریق PHP

    // Open document
    $document = new Document($inputFile);    
    $signature = new facades_PdfFileSignature($document);
    $pkcs = new PKCS7($inputPKCS7, 'Pa$$w0rd2020'); // Use PKCS7/PKCS7Detached
    $rectangle = new Rectangle(300,100,420,160);
    $signature->sign(1, true, $rectangle->toRect(), $pkcs);
    // Save output PDF file
    $signature->save($outputFile);    
    $document->close();