Install PHP on Ubuntu 16.04

List all php packages installed:

1	dpkg -l \| grep php\| awk '{print $2}' \|tr "\n" " "

Remove all php package:

1	sudo aptitude purge `dpkg -l \| grep php\| awk '{print $2}' \|tr "\n" " "`

Add PPA

1	sudo add-apt-repository ppa:ondrej/php

1 2	sudo apt-get update sudo apt-get install php5.6

You can install php5.6 modules too for example

1	sudo apt-get install php5.6-mbstring php5.6-mcrypt php5.6-mysql php5.6-xml

Verify your version

1	sudo php -v