As another newish web dev, I think it depends. Best thing is to take a look at your local job market and see what people are using. In my area it's a lot of .Net, so I'm focusing more on that. Some other areas have lots of PHP jobs, others have Rails, etc. If you don't care about any of that, I still probably wouldn't pick PHP honestly. I went with Go for my toy project backend, but NodeJS is another good option I think.
