PHP is not a pure OO language, in the sense that you can live without objects at all (as opposed to say Java where most things are objects). PHP5 supports polymorphism, inheritence and encapsulation C++ style, so it'll work if you're into OOP.

JSP is more concerned with presentation and have extras to make web presentation easier including the JSTL, while Java can be made into/from many things. JSP files are compiled into .java files, Java Beans are made from Java so you are looking at 2 different classes there really

For a large system short of enterprise, you could use Java Beans + Servlets + JSP to implement a MVC (Model-View-Control) based system.