1、下载composer

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

2、将composer.phar文件移动到bin目录，以便全局使用composer命令

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

3、切换镜像源

取消全局设置：composer config -g --unset repo.packagist

更换镜像源：composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

4、输入composer验证

5、测试，使用composer下载thinkphp

composer create-project topthink/think tp

 

详见：https://www.cnblogs.com/lamp01/p/6934257.html

https://www.cnblogs.com/chenyingying0/p/13598468.html

https://www.kancloud.cn/manual/thinkphp6_0/1037481