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How to Install PHP 5.6, PHP 8.0 and PHP 8.1 on Ubuntu 20.04 LTS

This article describes step-by-step how to install PHP versions 5.6, 8.0, and 8.1 on your Ubuntu. After installing the two versions, it also explains how you can disable one version and enable another version as the default version for the system. We have run the commands and procedures mentioned in this article on an Ubuntu 20.04 LTS system.