According to this new release from the Evans Data Corporation, certain technologies are being more well used in other areas besides in North America - including PHP.
There is a greater disparity with PHP use in Emerging Markets. The largest number of developers using the language can be found in Eastern Europe (39%). India and Brazil have similar usage at a little over 31%. In contrast, only 21% of Chinese developers are utilizing PHP. In North America, 35% of developers are using PHP.
They also talk about the usage rates of a few other technologies, including Flash, Ajax, Windows, and Linux.