PHP is a language used in the server scripting process. It is not used in static websites but if you want an interactive web page then PHP is the best way to write the code. The software is completely open-source and you can download it for free. You can also opt for some free PHP projects to understand the whole language properly. If you search online, you will find a lot of PHP projects available for download. You can get them and start practicing. If you search online then you will get PHP projects free with source code. So, you won't have to worry about the structure if you want to practice your skill.