初识Composer

关于vendor name和project name的区别？

包名(package name)包含了供应商名(vendor name)和项目名(project name)是为了避免命名冲突的

require包的查找顺序是什么？

会先在composer.json中找到key为repositories的值

如果找不到，则会到默认的Packagist中去找

分支名前面加dev是什么意思？

当你需要从VCS(Version Control System)中加载一个库时，则需要在你的自定义分支名前面加一个"dev-"的前缀

版本前面的波浪号表示什么意思？比如~2.1

it means >=2.1 <3.0

很重要，如何使用composer的帮助命令？

composer help + 命令 (composer help update)

require和require-dev的区别是什么？

The require-dev packages are packages that aren't necessary for your project to work and shouldn't be included in the production version of your project.Typically, these are packages such as phpunit/phpunit that you would use for unit testing your project.

如何去单独更新一个pakage?

php composer.phar update vendor/package