PPA with PHP 7.0. If you want a co-installable version of PHP, please use:

ppa:ondrej/php

where PHP 7.0 and PHP 5.6 co-exists.

You can get more information about the packages at https://deb.sury.org

For PHP 5.6 use: ppa:ondrej/php5-5.6
For PHP 5.5 use: ppa:ondrej/php5
For PHP 5.4 use: ppa:ondrej/php5-oldstable

BUGS&FEATURES: This PPA now has a issue tracker: https://deb.sury.org/pages/bugreporting.html