一，查看线上所有的库:

liuhongdi@lhdpc:/data/php/admapi$ composer show --all

查询时间较长，一般不必要

说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest

         对应的源码可以访问这里获取： https://github.com/liuhongdi/
         或: https://gitee.com/liuhongdi

说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，查看帮助

liuhongdi@lhdpc:/data/php/admapi$ composer show --help 

三，查看本地项目已安装的库:

liuhongdi@lhdpc:/data/php/admapi$ composer show —installed

说明：项目目录下 composer.lock存储了通过composer安装的库的信息  

四，查看一个已安装的库的详情:

liuhongdi@lhdpc:/data/php/admapi$ composer show topthink/think-orm

五,  安装一个第三方库:

liuhongdi@lhdpc:/data/php/admapi$ composer require topthink/think-mongo

如图: 看到Succeed!表示安装成功

六，升级一个第三方库:

liuhongdi@lhdpc:/data/php/admapi$ composer update topthink/think-mongo

如图:

七，卸载一个第三方库

liuhongdi@lhdpc:/data/php/admapi$ composer remove topthink/think-mongo

如图:

八，查找一个第三方库:

liuhongdi@lhdpc:/data/php/admapi$ composer search topthink/think-mongo
topthink/think-mongo mongodb driver for thinkphp6.0

九，查看composer的版本:

liuhongdi@lhdpc:/data/php/admapi$ composer --version
Composer version 2.2.1 2021-12-22 22:21:31

十，升级 composer版本:

1,查看当前版本:

liuhongdi@lhdpc:/data/php/admapi$ composer --version
Composer version 2.2.1 2021-12-22 22:21:31

2,升级：注意转到root账号下:

root@lhdpc:~# composer selfupdate
Upgrading to version 2.2.3 (stable channel).
   
Use composer self-update --rollback to return to version 2.2.1

3,查看当前版本:

liuhongdi@lhdpc:/data/php/admapi$ composer --version
Composer version 2.2.3 2021-12-31 12:18:53