How to Install PHP 8 on Ubuntu 18.04

To Ensure system updated.

apt update

If any update is available update the system and reboot.

apt upgrade -y && reboot

Add PHP PPA Repository

apt -y install software-properties-common

add-apt-repository ppa:ondrej/php

Output:

[email protected]:~# add-apt-repository ppa:ondrej/php
 Co-installable PHP versions: PHP 5.6, PHP 7.x and most requested extensions are included. Only Supported Versions of PHP (http://php.net/supported-versions.php) for Supported Ubuntu Releases (https://wiki.ubuntu.com/Releases) are provided. Don't ask for end-of-life PHP versions or Ubuntu release, they won't be provided.

Debian oldstable and stable packages are provided as well: https://deb.sury.org/#debian-dpa

You can get more information about the packages at https://deb.sury.org

BUGS&FEATURES: This PPA now has a issue tracker:
https://deb.sury.org/#bug-reporting  
.
.
.
Hit:1 http://nl.archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease [23.9 kB]
Hit:3 http://nl.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://nl.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:5 http://nl.archive.ubuntu.com/ubuntu focal-security InRelease
Get:6 http://ppa.launchpad.net/ondrej/php/ubuntu focal/main amd64 Packages [74.8 kB]
Get:7 http://ppa.launchpad.net/ondrej/php/ubuntu focal/main Translation-en [28.2 kB]
Fetched 127 kB in 1s (240 kB/s)
Reading package lists... Done

Install PHP 8

Ensure the added package is up to date.

apt update

If any update is available update the system and reboot.

apt upgrade -y && reboot

Install PHP 8 on Ubuntu

apt -y install php8.0

php -v

Output:

[email protected]:~# php -v
PHP 8.0.0 (cli) (built: Nov 27 2020 12:26:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.0-dev, Copyright (c) Zend Technologies
with Zend OPcache v8.0.0, Copyright (c), by Zend Technologies

To Install php Extensions.

NOTE: Replace the required extensions name in the command

apt install php8.0-<extension>

To list installed php modules/extensions.

php -m

This concludes our topic of installing PHP 8 on the Ubuntu 18.04 system.