class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
It is normal. The $ImgMod->image_watermark is not a method, it is a property. So the second time you set it, you remove the first value that you put there.
In order to add two watermarks, you need to call Process() twice.
In order to add two watermarks, you need to call Process() twice.
For instance, something like this: