PHP is one of the most commonly used open source programming languages on the Internet and to be able to fully work with it you need a web host supporting this language. Most web hosts offer some kind of affordable PHP hosting using the LAMP structure.
Originally PHP stood for Personal Home Page but now, after a lot of changes on the web, it stands for Hypertext Preprocessor. As mentioned is open source which in this case means that it is free to use. All of the commands are executed on the server side and they are written in HTML. A large number of the dynamic websites are written in PHP and the language comes with a great deal of applications.