1. 下载

      1. https://mirrors.aliyun.com/composer/composer.phar

    2. 全局命令

      1. mv composer.phar /usr/local/bin/composer
      2. # 给权限
      3. chmod 755 composer

    3. 阿里镜像

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