PHP grows and grows
A Netcraft survey from January 2013 shows that PHP is used on 244 million websites. That is a total of 39% of all servers monitored (2.1 million servers/vm's).
History of PHP and related projects
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PHP has come a long way in the last few years. Growing to be one of the most prominent languages powering the Web was not an easy task. Those of you interested in briefly seeing how PHP grew out to what it is today, read on. Old PHP releases can be found at the » PHP Museum.