PHP is an open source Web development language. Along with the Apache Web Server and Linux Operating System, PHP is among the most widely deployed and used pieces of open source software. PHP, according to NetCraft, has surpassed Microsoft ASP, making it the most popular Web development language and is being utilized on over 15 million Websites today.

PHP has proven itself across a range of large enterprise deployments at companies worldwide including: Hewlett-Packard, Boeing, Lufthansa, Dresdner Bank, Disney Online, Yahoo!, Lycos, Sprint, T-Mobile, Orange, Nortel Networks, Lucent, WallStreetOnline and Siemens.

http://www.megawebserver.com