Even ignoring that which other commenters have pointed out, I simply don't buy it for one reason: that PHP slice is way too small.
There's a certain level of professionalism in PHP projects, believe it or not, that is different from what you see in Ruby, Python, C++, etc. The difference? Many PHP programmers are not really hackers, they're just trying to get something done. They're not programming for the joy of it, for the most part, they're just trying to get some plug-in done for a CMS for some client.
The code and comments often end up structured and informational, in a Java kind of way.
Or maybe we're all just mature enough to realise swearing in comments is stupid, and trying to read anything from it is equally stupid?