Is it possible to code a site similar to Amazon in scale in PHP?

Is PHP scalable enough to grow a project into something large?

(Yes, I am aware of Facebook, maybe there are other 开发者_开发知识库examples?)

Yep. I'd venture to guess that Amazon's scalability has more to do with the architecture, caching/write mechanisms, and heavy usage of EC2 and S3 then their chosen language.

Yes, PHP scalable enough to grow a project. Why facebook is not enough to proof?

short answer: yes. There are quite a few large sites that run in PHP. Besides Facebook, Wikipedia and Flickr(I think) come to mind.

you can also see the list of large sites built in drupal, which is written in PHP.