PHP

PHP is a general-purpose scripting language. It was originally designed for dynamic web page content, and now focuses on server side scripting.

Because it is compatible with a wide range of platforms and operating systems it allows for a seamless integration and can be used for rapid application development (RAD).

PHP is a very well-established language. Its popularity continues to grow rapidly because it is free (it is open-source software), it is fast (It can be easily embedded into HTML), have full object oriented support and huge capability to build any sort of application which can run in web browser.