How do I prevent imagejpeg | imagepng | imagegif from returning?
 

It returns automatically, how do I stop it from returning?

Omit it till it's necessary? What are you trying to do? As I'm sure you know it either saves to a file, or returns the raw stream. If you need to do something further with the outputted image, perhaps you can save it to a temporary location, reopen it when you need and continue on with the script?
-m

I was thinking about that, but I didn't think it would be a good idea to just create a new file with it in there and then go through that files data. :P

Im not sure I understand the question fully. Could you explain it in a bit more details about what you're trying to do?

Nevermind, I found a way around my problem.