Install php ubuntu 20.04

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

sudo apt update

sudo apt install -y php7.4

Source: tecadmin.net

Install php 7.4 on ubuntu 20.04

sudo apt update
sudo apt install php7.4
sudo apt install php7.4-common php7.4-mysql php7.4-xml php7.4-xmlrpc php7.4-curl php7.4-gd php7.4-imagick php7.4-cli php7.4-dev php7.4-imap php7.4-mbstring php7.4-opcache php7.4-soap php7.4-zip php7.4-intl -y

Install php 7.1 on ubuntu 18.04

sudo apt install php7.1 php7.1-common php7.1-opcache php7.1-mcrypt php7.1-cli php7.1-gd php7.1-curl php7.1-mysql

Source: linuxize.com

Php 7 to php 8 in ubuntu 20.04

sudo apt install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt update
sudo apt install php8.0
 #install common extension 
sudo apt install php8.0-common php8.0-mysql php8.0-xml php8.0-xmlrpc php8.0-curl php8.0-gd php8.0-imagick php8.0-cli php8.0-dev php8.0-imap php8.0-mbstring php8.0-opcache php8.0-soap php8.0-zip php8.0-intl -y
  sudo a2dismod php7.0
  sudo a2dismod php7.1
  sudo a2dismod php7.2
  sudo a2dismod php7.3
  sudo a2dismod php7.4
sudo a2enmod php8.0
sudo service apache2 restart

Source: cloudbooklet.com

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