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//http://askubuntu.com/questions/565784/how-do-i-upgrade-php-version-to-the-latest-stable-released-version

php 5.6

sudo apt-add-repository ppa:ondrej/php5-5.6
sudo apt-get update
sudo apt-get install php5

php 7
sudo apt-add-repository ppa:ondrej/php
sudo apt-get install php7.0

//config php
/etc/php5/cli/php.ini
/etc/php5/cgi/php.ini
/etc/php5/apache2/php.ini