Too Long; Didn't Read
PHP is an open-source server-side programming language for web development. It is compatible with the major operating systems (macOS, Windows, Linux, Unix) and supported by a variety web servers (Apache, nginx, IIS, lighttpd) 79% of all websites are built on PHP, and the web tools you use daily, like Facebook, Wikipedia, Yahoo, MailChimp, and Pinterest, are among them. A PHP framework is a platform for creating PHP web applications. It contains libraries with pre-packaged functions and classes for software design patterns.