PHP is short for Hypertext Preprocessor. PHP is a server-side scripting language like ASP and are executed on the server. PHP is a server side scripting language and executed on the server. PHP can support a number of databases including MySQL, Informix, Oracle, Sybase, solid, PostgreSQL, Generic ODBC and others. In web hosting PHP MySQL, server side script runs on the server. In Web hosting PHP MySQL, the web server will pass the code from the browser to the PHP interpreter. The PHP interpreter residing on the web server runs through the script and produces the html that is delivered to the client browser. PHP is often used together with MySQL or Ingress. MySQL is a small database server which supports SQL and compiles a number of platforms. Both PHP and MySQL are open source software that means there are free to download and use. PHP used with MySQL are cross platform which means you can develop in Windows and serve on a Unix platform.