You can use many different programming languages to build web applications, but which language is the best language for web applications? That’s a tough question to answer because it can depend on many variables, including what kind of results you’re looking for and what kind of experience you already have.
PHP- PHP is very popular. And it is used to signify the PHP Hypertext Processor language and it is an interpreted script language. It is best suited for server-side programming that includes repetitive server-tasks performed during the development of your website. It is an open-source language and it is compatible with both Windows and Unix-based operating systems.
Most languages also come with a pre-defined application template specifically designed to speed up and insure best practice when coding web applications (MVC based frameworks). Struts in java, symfony for php are very popular.
Reason — PHP is pretty much fastest platform nowadays to build big applications with separation by abstracted modules and self-documented code. Practically in proper hands it will be bug-free programming when all components is connected via Interfaces and types with no fault point possible.