This next-gen Convenience Image is now considered stable! 
Reminder:
- Developer Hub URL: https://circleci.com/developer/images/image/cimg/php
- GitHub URL: https://github.com/CircleCI-Public/cimg-php
- Docker Hub URL: https://hub.docker.com/r/cimg/php
- example usage:
docker:
- image: cimg/php:7.4.12