First, let’s start off by saying, not everyone needs to do this step to code in PHP; however, the knowledge is required for your certificate. Hint: Read this page whether or not you need this step for your projects.
If your server does not support PHP:
You need to install a package, such as LAMP (Linux), MAMP (Mac), or WAMP (Windows).
Decide which one you need based on your operating System (Linux, Mac, or Windows).
To install one of the packages, follow the instructions on the official website: https://www.php.net/manual/en/install.php.