I find it hard to use this survey as actual statistics. I could not find any details on how they measure, how many sites and servers are measured and so on. As

I find it hard to use this survey as actual statistics. I could not find any details on how they measure, how many sites and servers are measured and so on. As far as I know, someone emailed his 400 friends on Facebook and placed the results in an excel-sheet. * Does it take volume into account? Github (Ruby, Java, Scala) alone serves more pages then your average 10K Wordpress-sites will. Yet Facebook (PHP) serves such a huge number that it might even dwarve all the "enterprice" C#, Java and Cobol sites of probably all governments in the entire EU. * Does it take economic value in account? One gov. site, or one large application (say, google docs) alone costs a multitude of what a 100K mom&pop PHP-webshops have cost. I, personally (as in: this is not a statistic nor any proof of anything) see a lot more value going around in the Ruby on Rails webdevelopment-economy then in the PHP-economy; the latter seems to consist of mostly a few-hundred-bucks Drupal installs or WordPress themes, whereas the first is almost always custom built and startup-development growing far over the 1K. * How do they adjust for "not recognised"? I mean: it is hard to hide the fact that you are running a Drupal site, even for something large as the Whitehouse.gov. Whereas your average custom-built Django-backend is probably not even accessible for crawlers and even if so, most probably not recognisable as being Python/Django powered. In other words: off-the-shelve stacks are far more often recognised; and are, quite probably, nearly always PHP. * How does this account for all the backend? Sure, WordPress is written in PHP, but many WP sites run off MySQL, which is just as important as the PHP-part; is WP not, PHP and MySQL powered then? Or other backends: the startup where I work now, has 90% of its code in the backend, Rails, with a tiny 200 lines PHP-app facing our users. This is certainly not a PHP-app, but would this survey count it as such?