I've been using PHP for most of my web development career (a decade). What are the industry standards for backend web development languages in 2020? I was under the impression PHP was the way to go for back end web development.
I would say golang has been a strong contender for that role for a while now besides the usual java/ruby/python stacks. You can use many languages for your backend, but golang is IMHO the best out there right now (but as always: it really depends on your use-case)
Hidden advertising for Go. Nothing better than good old C++.