From the 'was it really that long ago?' files:
On June 8, 1995, Rasmus Lerdorf issued the first public release of PHP. It's a language that became the key development language of the Web 1.0 world powering millions of sites (including InternetNews.com).
The article continues at http://blog.internetnews.com/skerner/2009/06/happy-birthday-php.html