<?php
use joseevillasmil\watermarker\PDFWatermark;
use joseevillasmil\watermarker\PDFWatermarker;
//Specify path to image
$watermark = new PDFWatermark('C:\myimage.png'); 
 
//Specify the path to the existing pdf, the path to the new pdf file, and the watermark object
$watermarker = new PDFWatermarker('C:\test.pdf','C:\output.pdf',$watermark); 
 
//Set the position
$watermarker->setWatermarkPosition('bottomleft');
 
//Save the new PDF to its specified location
$watermarker->save(); 
?>

可以使用五个位置。默认为'center'。

center
topleft
topright
bottomright
bottomleft