How to save php codes ?

Question

I have written php code in html code described in the php section. But now the problem is how can I save it to see the results like in html, we use .html or .htm please help as soon as possible.

Answer 1

Use .php

Answer 2

The php codes that save in html is not going to be executed.
PHP codes must save in php file, store and run by in php server.