PHP is very easy to learn and can do almost everything which other languages can do. I suggest everyone to start with php to learn the web fundamentals properly.
Why to choose PHP:
Easy to understand keeps your interest: Well for a beginner it is very important to understand the things in the initial phase otherwise may result in loss of interest.
It consists of very less configurations you can simply start by installing WAMP,LAMP or XAMPP. When you jump to other server side language, then you can easily relate with.Simple but essential.