The original post had the php code in it. It was part of the sentence, "which is nothing more than..." Right there is where I showed the contents of the page I load to test if php is working.

I have installed php and many other items using Homebrew. It updates brew and many other things while it's working and that appears fine. I don't see any error messages or conflicts or requests for root password nor anything else. However, when it's finished, I will try to load http://127.0.0.1/phpinfo.php which is nothing more than When I load this page in Firefox, it shows nothing but a blank page. If I view source, it shows the PHP code which tells me it was not interpreted and run on the server as it should have. It has been this way since several upgrades ago. It used to work fine, then all of a sudden it stopped and has behaved as described ever since. Every time I do another Mac OS system upgrade, I think it will fix itself but it never does. I would like to know a list of steps to see if it runs at all, to see if it runs incorrectly and to fix it if possible. This has moved to the front of my attention because I just upgraded to Mac OS Monterey 12.0.1.