This sounds very much like the new version of "I can tell it's a rails app by how it looks".
The idea that the server tier language has a direct effect on the user at the level of code quality we are discussing is naive at best and trollish at worst.
Are you seriously arguing that all backend languages are essentially interchangeable?
Give competent team A six months to build something in PHP and competent team B six months to build something in any of the better options and team B will build a better product every time.
The idea that the server tier language has a direct effect on the user at the level of code quality we are discussing is naive at best and trollish at worst.