What is it?
PHP is one of the earliest server side scripting languages for the web. It forms the basis for many popular Open-source projects such as Drupal, Magento and Wordpress.
What is it like?
Simple to pick up but not quite as powerful or elegant as more modern languages and platforms such as NodeJS and Python.
I stopped using this on any of my personal projects around 5 years ago but would be able to pick it up again for contract work as needs must.