By default on Apache web servers, PHP code will not execute in a file that does not have a
.php (or similar) extension. So even though you can embed PHP into a HTML file, it won’t execute when the file extension is
To change this, you can add a
.htaccess file to allow PHP execution.
Here are some examples depending on your system:
AddType application/x-httpd-php .html .htm
For certain hosting providers you may need to do this (adjust for PHP version too).
Addhandler application/x-httpd-php5 .html .php
Put this in a file called
.htaccess in the same folder as your HTML files.