PHP

Another solid option for web developers is PHP. This server-side scripting language powers 83 percent of websites and has been a vital back-end tool for tech giants like Facebook, Wikipedia, and Yahoo. PHP is also popular thanks to the role it plays in the WordPress content management system, which makes website development accessible to the masses. If you want to work as a freelance web developer, PHP is a practical language to learn. With more than 75 million websites running WordPress, there will always be a need for developers who can build custom PHP plugins and provide technical assistance.