From this chart they conclude that 'The web is being built with PHP':
However, if you combine it with this chart:
The conclusion looks more like 'PHP programmers write lots of extra lines of code compared to programmers using other languages'.
This fits in with my experience - the PHP version of the XOXO code ended up much longer than the Python one. Also, PHP's 'inline in HTML' structure does tend to lead to 'copy and paste inheritance' rather then writing library functions.
Link via Brad Feld.