PHP is a server side scripting language. Is is used to web development or web programming.However, here are many languages which are used for web development or web programming. But among all of them PHP is the most popular web scripting language.

• Open Source, PHP is completely free.
• PHP can be easily embedded directly into HTML.
• Platform independent can run on Windows Linux or Mac servers.
• Run faster on the internet and easily integrate AJAX, Callback etc.
• Interfaces very easily with Apache/MySQL
• It’s available with documentation in many languages.
• Easy to learn compared to many other scripting languages. It has a syntax that is easy to parse and is actually rather human-friendly.
• Lots of hosting services have it ready to use, no special configuration.
• Pretty easy to access other web-based tools through PHP i.e. google maps, etc.
• Lots of good source code out there to use and/or learn from, as well as many useful libraries for working with PDFs, graphics, etc.