sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install php5.6 php5.6-cli php5.6-common libapache2-mod-php5.6 php5.6-mysql php5.6-fpm php5.6-curl php5.6-gd php5.6-bz2 php5.6-mcrypt php5.6-json php5.6-tidy php5.6-mbstring php5.6-intl php-redis php-memcached php-gettext php-xdebug