How do i add an external php file to my html?

Question

I've been learning php in SoloLearn but i have not seen if i can make it without the html tags and if i can add it into my html.

Answer 1

add following in your html:
<?php
include "yourExternalFile.php";
?>
you can replace "include" with
include_once
or
require
or
require_once

according to the critical importance of data stored in the php file.

Answer 2

the php script will be launched together with the page loading.

Answer 3

Thank you.. how do i start an external php code? do i still have to add the html tags?