This is quite the oversimplification of the value vs. costs of automated testing while also being completely orthogonal to the discussion. I'd never accept "automated testing" by itself as a strong argument to prefer PHP or anything for that matter.
I suggest watching this: http://www.youtube.com/watch?v=9G77f9_tOSM
Also reading this https://plus.google.com/u/0/104920553571646483561/posts/fmyZ...