WordPress is an open-source content management system, that uses a number of programming languages to run. One of those languages is PHP.
Your PHP Version is Important
PHP is an open-source programming language that WordPress uses to run internal functions and process database information. It is installed directly on your web server and managed by your web host. PHP is a living project, and like WordPress, is constantly being updated and patched for bug and security vulnerabilities. Newer PHP versions fix these vulnerabilities and optimize the processing and delivery of your website content.