Introduction to PHP

PHP was known as "Personal Home Page" when it was created by Rasmus Lerdorf in 1994 to track his webpage's visitor.As PHP grew,it came to mean "PHP:Hypertext Preprocessor".PHP basically runs on the server side,taking PHP code as its input and creating Web pages as output.

PHP commonly bundled together with Linux[as the OS] and MySQl [as the database]
If you are interested in learning PHP,you can go here:

w3schools

I also have a simple tutorial and examples,that can be downloaded here.