###start containers docker-compose up

###enter php container and install symfony web

docker exec -it sym-php bash

symfony new project_name --full

Optional install pimcore demo app

echo 'create database pimcoredemo;' | docker exec -i sym-db mysql -uroot -proot

COMPOSER_MEMORY_LIMIT=-1 composer create-project pimcore/demo pimcoredemo
php pimcoredemo/vendor/bin/pimcore-install --mysql-host-socket=mysql --mysql-username=root --mysql-password=root --mysql-database=pimcoredemo --admin-username=admin --admin-password=admin