Updated and linked new version with Homebrew. Update path in terminal manager may help third party programs too.
PHP comes with its own PHP-FPM. For the new version I modified its config to run on a new port.
/usr/local/etc/php/8.0/php-fpm.d
e.g. ran this version at 127.0.0.1:9080
brew services restart php
Then in nginxcfg for a virtual host I updated its config to call php-fpm at that port. That site runs PHP 8.0. Others using old port seem to still be working with PHP 7.4.6. Unsure if that will survive a restart, or if only one version of php-fpm will be running (?)