It has been 10 years since Rasmus released the first version of PHP. To PHP developers want to thank everyone that has helped to shape PHP into what it is today; from the people developing the core and extensions, documentors, script developers, bug reporters, beta testers, PHP application developers and even just people that are using PHP.
PHP is an open-source programming language used by many dynamic websites. Take a look here  if you are interested in the history of PHP. The first version of PHP was released on June 8, 1995 by Rasmus Lerdorf.