This is the server side scripting language designed and suitable for web development. If you have worked upon Python or Ruby then, PHP won’t be difficult to handle. Secondly, it is the most widely used general purpose programming and has turned the way people looked at the web.
Most of the websites has their server side programs written in PHP. It easy to understand and easy to use language, but it is more vulnerable to web attacks. One has to be very cautious while writing PHP code. Secondly, it also lacks multi threading at the core level. Despite these vulnerabilities and missing features, it is rated as one of the most popular general programming languages in the world. Many of the web content management systems are written using PHP. Few of such systems are Word Press, Moodle, Digg and the user-facing portion of Facebook.