More important is to talk about the security of their underlaying engines.

What use is it when you can make a website in 2 lines of code if it's security stink? None...

Ruby is beautiful but not written to drive a website (besides that you cannot use it without a framework it also shows security wise).

Python is similar to Ruby in that perspective.

On the other hand PHP is good to drive websites without framework but is a bit handycapped on the commandline.

If there is one language that is able to replace PHP it will be Lua.

Anyway, all languages have their cons and pros.