Turbo Engine
sudo apt-get update
sudo apt-get install -y software-properties-common
wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key | sudo apt-key add -
echo deb http://dl.hhvm.com/ubuntu trusty main | sudo tee /etc/apt/sources.list.d/hhvm.list
sudo add-apt-repository -y ppa:nginx/stable
sudo apt-get update
sudo apt-get install -y hhvm nginx
sudo /usr/share/hhvm/install_fastcgi.sh
sudo service hhvm restart
sudo update-rc.d hhvm defaults
# Use HHVM for /usr/bin/php even if you have php-cli installed:
sudo /usr/bin/update-alternatives --install /usr/bin/php php /usr/bin/hhvm 60
php -v