HOWTO : Downgrade from PHP7.0 to PHP5.6 on Ubuntu 16.04 LTS

When you upgrade to Ubuntu 16.04 LTS from Ubuntu 14.05 LTS, PHP5.6 will not be uninstalled or deleted. However, if you deleted yourself and your web application does not compatible to PHP7.0, you need a way to downgrade it back to PHP5.6. Here is the way but some settings will be similar to PHP7.0 for newly installed PHP5.6. Here you are :

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update

sudo apt-get install php5.6-cgi php5.6 php5.6-cli php5.6-mysql php5.6-curl php5.6-gd php5.6-intl php-imagick php5.6-imap php5.6-mcrypt php-memcache php5.6-pspell php5.6-recode php5.6-sqlite3 php5.6-tidy php5.6-xmlrpc php5.6-xsl php-xcache php5.6-fpm

That's all! See you.