You can't run PHP
in an html page ending with .html
. Unless the page is actually PHP and the extension was changed with .htaccess
from .php
to .html
What you mean is:
index.html
<html>
...
<?php echo "Hello world";?> //This is impossible
index.php //The file extension can be changed using htaccess, ex: its type stays php but will be visible to visitors as index.html
<?php echo "Hello world";?>