Answers for "install php 8 ubuntu alongside php 7"

ubuntu install php 8

# Ubuntu 20.04
# List existing PHP packages
dpkg -l | grep php | tee packages.txt

#Add ondrej/php PPA
sudo add-apt-repository ppa:ondrej/php # Press enter when prompted.
sudo apt-get update

#Install PHP 8.0 with CLI
sudo apt install php8.0-common php8.0-cli

#Additional extensions
sudo apt install php8.0- { bz2,curl,intl,mysql,readline,xml }

install php 7.3 ubuntu

sudo apt install php7.3-cli php7.3-fpm php7.3-json php7.3-pdo php7.3-mysql php7.3-zip php7.3-gd  php7.3-mbstring php7.3-curl php7.3-xml php7.3-bcmath php7.3-json