[Zope] PHP vs Zope

Hello, I recently started to work with php (+ Apache), and now I found Zope. At the first sight, Zope seems to be faster than php, but I don't know if it's my php application that is not so complex than Zopes objects. So I would like to ask, is there a benchmarks or articles or any sources that discuss about performance and developing PHP versus Zope? Also, i am cuirious, was Zope developed to replace PHP in the future? And what if PHP comes up with an interface like Zope, so what would be better? Many questions, isn't it .... Any comments are welcome. Thanks. Nikolai