1、下载composer

curl -sS https://getcomposer.org/installer | php

2、将composer.phar移动至bin目录以便全局

mv composer.phar /usr/local/bin/composer

3、切换国内源

composer config -g repo.packagist composer https://packagist.phpcomposer.com

4、输入composer验证，如下表示安装完成

   ______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                    /_/
Composer version 2.3.6 2022-06-01 21:57:13