composer安装

1.下载

　　curl -sS https://getcomposer.org/installer | php

 

2.配置全局composer 

　　mv composer.phar /usr/local/bin/composer

 

3.切换国内源

　　composer config -g repo.packagist composer https://packagist.phpcomposer.com

 

4.使用composer更新项目框架

　　composer update