GNU/Linux Elementary OS 5 Install PHP 5.6 – Step by step Guide
How to Install PHP 5.6 on Elementary OS 5.0-Juno/5.1-Hera GNU/Linux desktop – Step by step Tutorial.
And to get the PHP 5.6 Elementary OS 5 Setup you have to Manually Setup the Elementary OS Apt PPA Repository.
Finally, this PHP 5.6 PPA includes also All the most Useful Extensions for PHP usage.

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1. Launching Terminal
Open a Terminal window
(Press “Enter” to Execute Commands).
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