Apache web server is an open source web server that can be freely downloaded from http://httpd.apache.org/download.cgi . A web server is a program that delivers files to the application or web pages to the browsers via HTTP protocol.
PHP, an acronym for PHP: Hypertext Preprocessor, is a open source server-side scripting language that is designed for creating dynamic web pages. It can be freely downloaded from http://www.php.net/downloads.php. read full article