阿里云 腾讯云 华为云 composer 镜像
镜像地址: 阿里云: https://mirrors.aliyun.com/composer/ 腾讯云: https://mirrors.cloud.tencent.com/composer/ 华为云: https://mirrors.huaweicloud.com/repository/php/
其他的: laravel-china:http://packagist.laravel-china.org/ (相对稳定,更新频率有点慢) cnpkg: https://php.cnpkg.org/ (速度不太稳定,更新频率比较快) phpcomposer: https://pkg.phpcomposer.com/ (凉了有段时间了)