เพิ่มลายน้ำผ่าน PHP

    // Open document
    $document = new Document($inputFile);
            
    $formattedText = new facades_FormattedText("Watermark", 
        (new Color())->getBlue()->toRgb(),
        (new facades_FontStyle())->Courier, 
        (new facades_EncodingType())->Identity_h, 
        true, 72.0);

    $horizontalAlignment = new HorizontalAlignment();
    $verticalAlignment = new VerticalAlignment();

    $artifact = new WatermarkArtifact();        
    $artifact->setText($formattedText);        
    $artifact->setArtifactHorizontalAlignment ($horizontalAlignment->Center);
    $artifact->setArtifactVerticalAlignment ($verticalAlignment->Center);
    $artifact->setRotation(45);
    $artifact->setOpacity(0.5);
    $artifact->setBackground(true);
    $document->getPages()->get_Item(1)->getArtifacts()->add($artifact);
    
    // Save output document
    $document->save($outputFile);
    $document->close();