PHP is a popular open-source (free to use and free for all programmers who want to use it) language.
It is popular because a large number of pages and web Portals are created.
It is used to generate dynamic Web pages. Remember that we call a static page whose contents always remain the same, while we call dynamic pages those whose content is not always the same.
The Best Example to understand we talk about Facebook when you log in you always see a different Home page in facebook you see change based on changes in a database, searches or contributions from users.
Little History Of PHP
it was First introduced in 1994 by Rasmus Lerdorf (Danish Canadian programmer). the first incarnation was a simple set of Common Gateway Interface (CGI) binaries written in C programming language.
In June 1995, Rasmus released the source code to the public, which allowed developers to use it the way they wanted it. This allowed and encouraged users to provide bug fixes in the code and, in general, improve it.
In 1998, shortly after PHP 3.0 was officially released, Andi Gutmans and Zeev Suraski began working on a core PHP rewrite.
The history is not over yet! In December of 2015, after years of development, PHP 7 is officially launched. Among the most significant new features with this version, in some cases up to 9 times faster, and now we are using it.
Some companies that use PHP
Today, large companies in the market use this language as the main for the development of their systems. like Facebook, which started using it and then developed their own PHP-based language; Wikipedia, which uses one of the numerous CMS, and other companies known as Twitter, MailChimp, Yahoo, Slack, BMW, KingHost, among others.