Ubuntu 16.04：安裝php7.4

sudo apt-get update
sudo apt -y install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt -y install php7.4

sudo apt-get update

sudo apt -y install software-properties-common

sudo add-apt-repository ppa:ondrej/php

sudo apt-get update

sudo apt -y install php7.4

參考：

How To Install PHP 7.4 on Ubuntu 20.04/18.04/16.04