I’m a 3x startup founder, full-stack engineer, and indie hacker building in public and mentoring future builders.
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php mysql and javascript can be used for creating web apps, but all those three has different areas to look for. javascript is a client side language (it can also be run on the server side) php is a server side language (it powers facebook) mysql is a database , that stores the data of the app. As your question, when you can use javascript for front end and back end then why use php and mysql? i use Meteorjs, which goes with the saying: one language to rule them all. you write the back end and the front end of the app, using javascript. again you would be needing a database to store the data, meteor for default use Mongodb.
You can use Goolge Chrome extention: react-detector. When you are browsing a website built on react, it will let you know. Some other useful Chrome extention's: React Developer Tools (Adds React debugging tools to the chrome developer tools) Show me React (Highlights react components on the page)