"no you cannot do anything in PHP that you can do in Python or Perl!"
that statement in itself is true, but PHP is a web language and as for things to do ON THE WEB yes I would argue it is more feature rich.
Even if you disagree with the Python comparison it certainly beats the current state of Perl all the hell.
Source: I've developed in all three for work.
I've only ever developed in PHP (well, I tried ruby for a few months then ran away screaming in frustration), but I know of things in python/perl that PHP is missing.