Turns out this is both order-sensitive and invalid. I pasted `.travis.yml` into http://lint.travis-ci.org/

It says:

  in language section: does not support multiple values, dropping c
  in language section: does not support multiple values, dropping php

So, first one wins.

Travis doesn't officially support multiple languages in a single project yet, so we'll have to work around...

https://groups.google.com/forum/#!topic/travis-ci/3pzCgvxWZAo