Quick start:
$ PHP_VERSION=7.2
$ WEB_ROOT=/path/to/your/web/root
$ HOST_PORT=8080
$ git clone https://github.com/tdmalone/docker-apache-phpX.git
$ docker build --tag php${PHP_VERSION} docker-apache-phpX/php${PHP_VERSION}
$ docker run --rm --detach --publish ${HOST_PORT}:80 --volume ${WEB_ROOT}:/var/www --name php${PHP_VERSION} php${PHP_VERSION}
Then visit http://localhost:8080.
If you set your web root to the folder that docker-apache-phpX was cloned into (eg. by running WEB_ROOT=$PWD), then you can visit http://localhost:8080/docker-apache-phpX/phpinfo.php to prove that you're running PHP 7.2.
When you've finished, you can clean up by running:
$ docker stop php${PHP_VERSION}
See the root README for this repo.