Welcome to the PHP tutorial. PHP stands for HyperText Preprocessor and is a server side scripting language used to produce dynamic webpages. PHP is free and open-source and works with all major operating systems, which is why most companies use it (Facebook, Google, and so on). In this series you will learn the basics of PHP as well as advanced topics, including PHP + MySQL. These tutorials were written using PHP 5.4, so it is best to make sure you have PHP 5.4 or higher.