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

###composer创建项目

composer create-project laravel/laravel  ./shop 

###composer初始化依赖包
{
“require”: {
“predis/predis”: “^1.1”
}
}

composer init  

###composer查询包

composer search predis  

###更新下载依赖包从lock中读取如果有

composer install preids   

从json中读取

composer update   predis   

直接命令行获取 不依赖于 composer.json

composer  require  predis/predis=^1.1 

###移除指定包

composer remove predis  

#从composer 安装目录类执行全局移除phpunit

composer global remove phpunit/phpunit 

###帮助命令

composer 命令名称 --help  

###composer软件自身更新

composer self-update  

###composer的其他常用命令#查看所有命令

composer list  

包名 #显示包信息

composer show 

#生成自动加载文件

composer dumpautoload