Backend is backend and PHP is still one of the best, easiest tools for that with more then 20 years of history, bugfixing, optimization, development, evolution while Node.js has only 5. PHP7 is also very fast. In PHP community for so many years today we have only few solid frameworks and tools. When you want X, you know what to do while in Node.js you will need to write a lot of stuff yourself or waste more time browsing thousands of packages.
cengkuru michael
Full Stack Web Developer