If you think PHP is looked down on by those who care about language features because of a popularity context, rather than because of asinine language decisions and limited support for modern programming paradigms, I think it's you who is missing it. Since any program can technically be written in any (Turing Complete) language, the fact that some big sites were made to work with PHP also sort of misses the point. When most of the big "success stories" adopted PHP, options for web-friendly open source languages were much thinner. Now if you look at the new development projects they highlight, you don't see PHP come up that much. Facebook, for example, is prominently using Haskell. I don't know anyone who both programs in Haskell and is willing to touch PHP.
Of course, many thoughtful criticisms of PHP have been discussed on HN. e.g. https://eev.ee/blog/2012/04/09/php-a-fractal-of-bad-design/ & http://poincare101.blogspot.com/2011/11/php-sucks-but-some-f....