Install PHP 5.6 Debian Sid Unstable
How to Install PHP 5.6 for Debian Sid Unstable GNU/Linux – Step by step Tutorial.
First, to Install PHP 5.6 on Debian Sid Unstable follow the Apt Repository Setup.
Finally, included you find instructions on How to Switch between PHP Versions on Debian GNU/Linux.

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1. Launching Shell Emulator
Open a Terminal window
(Press “Enter” to Execute Commands) -
2. Enabling PHP 5.6 Repository
Add PHP 5.6 Repo for Debian GNU/Linux
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3. Installing PHP 5.6
Now to Install PHP 5.6 for Debian.
sudo apt install php5.6
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4. Switching PHP Version
Finally, to Switch between PHP Versions.
sudo update-alternatives --config php
Make Selection and Press ‘Enter’ to Confirm!
So Now I’m truly Happy if My Guide could Help you to Install PHP 5.6 on Debian Sid!