There’s a great presentation here from Michael Radwin at the 2005 Zend PHP Conference. He talks on how PHP was selected over a whole bunch of others in 2002 for web site development in Yahoo…

No matter what people may say about their scripting language being better than PHP for enterprise use, the proof is in the pudding. Friendster and Yahoo are just some of the companies betting their business model on PHP.

File here

Thanks to Jaydee of PHPUGPH for pointing it out.