I've done god only knows how many searches looking for a solution to this with no joy so any help you can offer would be great.

I'm after an image editor that has the following:

1. Must be PHP or JavaScript (even jQuery) or some combo of the two
2. Must allow images to be uploaded
3. Must allow text to be dynamically added, resized, color changed and positioned
4. Must allow fonts to be chosen from a list of fonts I upload to the server, not the basic browser fonts or Google Fonts etc.
5. Must allow generation and download of new image based on the old image + the added text

This is for my users, none of whom are experienced enough to do offline image editing.