I'm not sure if this is a troll question. Elaborate on why you are asking. You are asking: "what do you think of pudding" instead of "hey, I'm having a dinner party and can't decide between apple pie and pudding, help me!"
However, I recently read an article on YC about how many startups go through a phase debating about which language an application should be built on. We did not give this much thought as we saw a few prominent websites like facebook use PHP and we thought PHP seemed to be a pretty scalable language. Plus, with support for OOP (as of PHP 5), PHP seemed to be a pretty good choice.
I am interested in evaluating if we made the right decision