PHP is a general-purpose scripting language widely used as a server-side language for creating dynamic web applications (Facebook,Wikipedia,Flipkart etc.).Though its reputation is mixed, PHP is still extremely popular and is used in over 75% of all websites where the server-side programming language is known.
Java is one of the most popular programming languages out there. Released in 1995 and still widely used today, Java has many applications, including software development, mobile applications, and large systems development. Knowing Java opens a lot of possibilities for you as a developer.
Go, or Golang, is an open source programming language developed at Google. The designers of Go wanted developers to have a programming language that made it quick and easy to develop applications. Go is used on servers, web development, and even command line interafaces.