PHP images - Add image over another image that has been created with PHP

PHP images - Add image over another image that has been created with PHP

Basically I have to work with a ID Card PHP thing that requires me to add
the name of a participant and upload a picture. I have a basic template
for the ID Card and I'm using PHP to add the name. I have to add the
picture of the participant on a particular spot. The name is working but I
cannot add a picture of the participant over the generated PHP image.
Here's my code:
http://chopapp.com/#arcqwgf4
How should I go about adding the picture over the PHP generate image.
Sorry if this is confusing :/