composer源相关命令:

1>composer 查看源信息:
composer config -gl
  
2>使用阿里云源码:
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
  
3>恢复到默认源:
composer config -g --unset repos.packagist
  
4>清理缓存
composer clearcache