getcomposer.org/download
1、下载1.8.5 composer.phar
2、放在php.ini同级目录
3、创建composer.bat文件
@php "%~dp0composer.phar" %*
4、cmd 任意路径 输入 composer -V 查看成功
5、切换国内镜像
composer config -g repo.packagist composer https://packagist.phpcomposer.com
官方源: https://packagist.org
国内: https://packagist.phpcomposer.com
阿里云: https://mirrors.aliyun.com/composer/
腾讯: https://mirrors.tencent.com/composer/