Are there any programs available to view PHP code over the HTTP protocol?

Yes, one common way to view PHP code over the HTTP protocol is to use a web server with PHP support installed. By placing your PHP files in the web server's document root directory, you can access and view them through a web browser using the server's URL. This allows you to see the output of the PHP code when accessed through the HTTP protocol.

<?php
// Your PHP code here
echo "Hello, World!";
?>