First, follow http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian/
# apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
# echo 'deb http://downloads-distro.mongodb.org/repo/debian-sysvinit dist 10gen' | tee /etc/apt/sources.list.d/mongodb.list
# wget http://repos.zend.com/zend.key -O- |apt-key add -
# echo 'deb http://repos.zend.com/zend-server/6.2/deb_ssl1.0 server non-free' | tee /etc/apt/sources.list.d/zend-server.list