I installed a new local server, when I installed php5 package with apt-get install php5 it got the version 5.6.
My production server is still with php 5
I know that it's a little late to answer this question , but for anyone like me who is confused when upgrading php , I should say please note that before installing new version of php remove it completely from your system, even remove config files and extensions, It caused me so many errors and problems.
sudo apt-get purge php.*
sudo rm -rf /etc/php5
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:ondrej/php5-5.6
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install php5