Seperating presentation from logic

I'm just about to start a large PHP project in which I get to work with professional designers/layout people. I want to separate all the programming logic from the presentation but I am not sure how to do this. Can anyone point me to resources (web tutorials/articles or books) that would help me figure out how best to separate my programming work from designer's work and how best to integrate them? Sorry for asking such a generic question but I don't know how to best phrase it. I did look on the web but the best I could find were some mentions of templates. While templates seems ok they don't address all the issues of separation presentation from code (if I understand them correctly). Thanks! Jc