We will use the Ondrej PPA for installing PHP on Ubuntu 22.04 LTS system. Which contains PHP 8.2, 8.1, 8.0, 7.4, 7.3, 7.2. 7.1, 7.0 & PHP 5.6 packages. We can install any of the versions as required for your application. In this tutorial, we will learn how to install PHP on Ubuntu 22.04 LTS system. This tutorial is also compatible with Ubuntu 20.04.

Step 1: System Update

First, log in to Ubuntu 22.04 via console. Then update the Apt cache and upgrade the current packages of the system using the following command:

sudo apt-get update
sudo apt-get upgrade

When prompted, press y to confirm the installation.
 

Step 2: Installing Multiple PHP Versions on Ubuntu 22.04

The easiest way to install multiple versions of PHP is by using the PPA from Ondřej Surý, who is a Debian developer. To add this PPA, run the following commands in the terminal. The software-properties-common package is needed if you want to install software from PPA. It’s installed automatically on the Ubuntu desktop but might miss on your Ubuntu server.

sudo apt install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt update

The SURY repository contains PHP 8.2, 8.1, 8.0, 7.4, 7.3, 7.2, 7.1, 7.0 & PHP 5.6. As the latest stable version of PHP is 8.0, but many websites still required PHP 7. 

You can install any of the required PHP versions on your system.

Install PHP 8.1:

Now you can install PHP8.1 on Ubuntu by executing the following command:

sudo apt-get install php8.1 php8.1-fpm

And install some common PHP8.1 extensions.

sudo apt-get install php8.1-mysql php8.1-mbstring php8.1-xml php8.1-gd php8.1-curl

When prompted, press y to confirm the installation.

Install PHP 7.4:

Now you can install PHP7.4 on Ubuntu by executing the following command:

sudo apt-get install php7.4 php7.4-fpm

And install some common PHP7.4 extensions.

sudo apt-get install php7.4-mysql php7.4-mbstring php7.4-xml php7.4-gd php7.4-curl

Step 3: Check Active PHP Version

Now after installation, verify that the correct version of PHP is installed by checking the version number by the below-mentioned command:

php -v

# Output
PHP 8.1.8 (cli) (built: Jul 11 2022 08:30:39) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.8, Copyright (c) Zend Technologies
   with Zend OPcache v8.1.8, Copyright (c), by Zend Technologies

Step 4: Switch the Default PHP Version for CLI

If you have multiple versions of PHP installed on Ubuntu 22.04, you can choose to make one of the versions the default PHP version.

To list the available versions, run the following command:

sudo update-alternatives --config php

Step 5: Uninstalling PHP Versions

If any PHP version is no more required, it can be removed from the system. That will free the disk space as well as system security.

To uninstall any PHP version, Run the following command:

sudo apt-get remove php5.6

Also, uninstall all the modules for that version, Run the following command:

sudo apt-get remove php5.6-*