add-apt-repository ppa:ondrej/php

# 安装PHP
apt-get install php8.1-fpm
apt-get install php8.2-fpm
apt-get install php8.3-fpm

# composer
php8.2 /usr/local/bin/composer install
php8.2 /usr/local/bin/composer update

vim ~/.bashrc

alias composer8.1='php8.1 /usr/local/bin/composer'
alias composer8.2='php8.2 /usr/local/bin/composer'
alias composer8.3='php8.3 /usr/local/bin/composer'

source ~/.bashrc

composer8.2 install