Add repos:

echo -e "deb http://repo.mongodb.org/apt/debian jessie/mongodb-org/3.4 main\ndeb http://packages.dotdeb.org jessie all" >> /etc/apt/sources.list

Add signing keys for mongo repo and php7:

apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6

wget https://www.dotdeb.org/dotdeb.gpg
apt-key add dotdeb.gpg
rm dotdeb.gpg 
aptitude update

Install packages:

aptitude install mongodb-org php7.0-bcmath php7.0-bz2 php7.0-curl php7.0-dba php7.0-dev php7.0-fpm php7.0-gd php7.0-json php7.0-mbstring php7.0-soap php7.0-xml php7.0-zip

Start monogdb:

systemctl enable mongod.service
systemctl start mongod.service

Edit /etc/php/7.0/cli/php.ini to these values:

date.timezone = Europe/Berlin

adduser --disabled-login --gecos '' client
usermod -aG mongodb client

• https://docs.mongodb.com/master/tutorial/install-mongodb-on-debian/
• https://www.cyberciti.biz/faq/installing-php-7-on-debian-linux-8-jessie-wheezy-using-apt-get/