一、安装 Composer

Composer 官网 https://getcomposer.org/

安装方式1：
curl -sS https://getcomposer.org/installer | php

安装方式2：
php -r "readfile('https://getcomposer.org/installer');" | php

中国全量镜像 https://www.phpcomposer.com/

安装方式3：
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"

php composer-setup.php

php -r "unlink('composer-setup.php');"

二、镜像地址

1.Packagist（默认）

1.恢复默认镜像地址：
composer config -g --unset repos.packagist

2.手动设回默认镜像：
composer config -g repo.packagist composer https://repo.packagist.org

2.阿里云 Composer 全量镜像

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer

3.腾讯云 Composer 全量镜像

composer config -g repo.packagist composer https://mirrors.cloud.tencent.com/composer/

4.华为开源镜像站

composer config -g repo.packagist composer https://mirrors.huaweicloud.com/repository/php/

5.中国全量镜像

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

6.SJTUG 软件源镜像服务（上海交通大学）

composer config -g repo.packagist composer https://packagist.mirrors.sjtug.sjtu.edu.cn