Which programming language should I choose? [closed]

I'm currently working on a project where the product is a database-driven web application. I have previous experience with PHP, JS, HTML, CSS and a little bit of C++ (arduino related). HTML, CSS and JS are languages I will need either way, so my question is should I stick with PHP or go over to python for this project. Initially my plan was to go with PHP, but from what I've heard and read, it's about time I learn python because of it's libraries and that its productive and simple? (I've not been programming in python before, just scratched the surface.) I've also heard its slow and that there are some syntax issues?

Please leave your thoughts, thanks!