There is always a big debate surrounding what language to learn, and I don't think you'll get a solid answer from us. You'll have people arguing about which language is better. PHP, Python, and Ruby frameworks seem to be most popular here on HN. If you're new, my advice would be to experiment with different languages/frameworks but eventually have a "go to" one. Choosing a framework that you enjoy is a discovery process. Along the way you'll learn about language design.

By the way, GET requests are part of the HTTP protocol. Every web-based framework should support them, not just PHP-based ones. HN is written in Arc, a dialect of Lisp created by Paul Graham.

I personally use Python/Django :)