How to make php work on linux?

Question

mint

Put LAMP on Linux Mint -
PhpMyAdmin works, localhost too
But when you try to create a folder with a site and access this site from a browser - it does not interpret it as a PHP script - in the source code it shows
<?php
echo('hi');
?>
That is, it perceives my test page not as Php but as an Html file.
How to fix

Answer 1

enable open short tag
or use <?php

Answer 2

linux mint 18.2 suddenly doesn't work like yours. I looked in /etc/ for two php7 folders, almost empty. And php has php.ini. And for a long time. And in debian I didn't even think about it. Everything worked. Conclusion, do not believe, but look at typical configs where they lie, what is in them. And so no one will tell you.