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!"
Well, we have used PHP extensively until now. We have gotten more disciplined in designing code, compartmentalizing it into classes, documenting the code etc.
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
