DynamicWebPages.de has posted their new statistics for PHP usage in the community for this past month:
After the small decrease in the last month, PHP made it back up easily. For the first time since April 2006, the 20 million mark on the number of domains has been passed. In contrast to the previous month that means a jump of nearly 800,000 domains. The number of IP addresses, on which PHP is installed, also has numbers worth checking out. With 1,332,514 IP addresses on record, this month's numbers are the highest conditions since September 2004.
You can check out the graph and the statistics for the last year in their statistics page of their site.