In the 21 years since its inception, PHP has become the world’s most popular server side scripting language. Known as a powerful, easy to learn language, PHP, according to one metrics site, is used by 82% of all the websites whose server-side programming language is known. In more cases than not, if you encounter a desktop application that has a user-interface, such as an e-commerce applications or social media sites, the likelihood exists that it’s coded in PHP.