What is PHP

PHP is an open-source, server-side scripting and programming language that’s primarily used for web development. The bulk of the core WordPress software is written in PHP, which makes PHP a very important language for the WordPress community. Some like to state that PHP as a programming language is dead but that’s not true.

There are different versions of PHP that you can install on your server, with the newer PHP 7.3 and 7.4 offering significant performance improvements. Those performance improvements, plus improved security, are why Kinsta always offers .

In this post, we’ll explain more about what “server-side” means and how PHP functions. Then, we’ll move into some of the ways that PHP specifically applies to WordPress and WordPress sites.

Introduction to Plugin Development