Self-study, I just failed to compile helloworld

Question

What is the problem? Is it related to nginx? I saved it with sublime text3 and opened it directly on the server with a browser

Answer 1

It needs to be plugged in the server environment, that is, the http/https protocol. You are under the local file://, of course it will not work

Answer 2

Change the file name to index.php There is also

Answer 3

Change the suffix to .php