apt-get update && apt-get install -y software-properties-common && \
add-apt-repository ppa:ondrej/php

apt-get update && apt-get install -y --allow-unauthenticated php7.1 php7.1-zip php7.1-mb php7.1-mysql php7.1-common php7.1-gd  php7.1-intl php7.1-mcrypt php7.1-xml php7.1-curl php7.1-cli php7.1-json php7.1-ldap php7.1-soap php7.1-dev php7.1-igbinary php7.1-apcu php7.1-redis

a2dismod php7.0 && \
a2enmod php7.1 && \
service apache2 restart

occ maintenance:install  --database=mysql --database-name=owncloud --database-host=db:3306 --database-user=owncloud --database-pass=owncloud --admin-user=admin --admin-pass=admin --data-dir=/mnt/data/files