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

php composer-setup.php

删除当前目录下的 composer-setup.php 安装文件

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

2.移动 composer.phar，这样 composer 就可以进行全局调用
mv composer.phar /usr/local/bin/composer

3.切换为国内镜像
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

4.更新 composer：
composer selfupdate

5.查看是否成功
composer --version

转载自https://blog.csdn.net/qq_29241015/article/details/115583709