Why doesn't php work in html?

Question

PHP

Hello. Doesn't want to work php in html.
I took an example from here php-include.ru/stati/kak-dobavit-php-kod-v-html-st...
And also Why doesn't php code work in html?
How to be?

Answer 1

Закройте туториал из которого Вы берёте код и никогда не открывайте. И пожалуйта, не пытайтесь больше вставить PHP в HTML.

Answer 2

The server decides what to interpret and how.
That is, if the web server is not configured to execute php in html files, it will not execute it.
And in the case, what is the problem with making the file extension php