composer

emm... 其实 composer 的命令都是依赖 composer.phar 文件来的，使用 composer 命令，只不过是将其放到 $PATH 环境变量里

Installing dependencies

Command	Description
`composer install`	优先使用依赖文件 `composer.lock` 去下载安装依赖库，如果 `composer.lock` 文件不存在，则会会根据 `composer.json` 去下载依赖库并安装，并且重新生成 `composer.lock` 文件
`composer install --dry-run`	模拟安装依赖

注意：
composer.lock $1 被提交到版本控制仓库里. 可追踪其在版本库中的状态.
如果发生修改, 你应该执行composer install，使重新构建你本地的依赖.

Command	Description
`composer update`	Updates all packages
`composer update --with-dependencies`	Updates all packages and its dependencies
`composer update vendor/package`	Updates a certain `package` from `vendor`
`composer update vendor/*`	Updates all packages from `vendor`
`composer update --lock`	Updates `composer.lock` hash without updating any packages

This command changes only the composer.lock file.

Command	Description
`composer dumpautoload -o`	Generates optimized autoload files

Command	Description
`composer require vendor/package`.	Adds `package` from `vendor` to composer.json's `require` section and installs it
`composer require vendor/package --dev`	Adds `package` from `vendor` to composer.json's `require-dev` section and installs it.

This command changes both the composer.json and composer.lock files.

Command	Description
`composer require vendor/pkg "1.3.2"`	Installs `1.3.2`
`composer require vendor/pkg ">=1.3.2"`	Above or equal `1.3.2`
`composer require vendor/pkg "<1.3.2"`	Below `1.3.2`
`composer require vendor/pkg "1.3.*"`	Latest of `>=1.3.0 <1.4.0`
`composer require vendor/pkg "~1.3.2"`	Latest of `>=1.3.2 <1.4.0`
`composer require vendor/pkg "~1.3"`	Latest of `>=1.3.0 <2.0.0`
`composer require vendor/pkg "^1.3.2"`	Latest of `>=1.3.2 <2.0.0`
`composer require vendor/pkg "^1.3"`	Latest of `>=1.3.0 <2.0.0`
`composer require vendor/pkg "^0.3.2"`	Latest of `>=0.3.0 <0.4.0` (for pre-1.0)
`composer require vendor/pkg "dev-BRANCH_NAME"`	From the branch `BRANCH_NAME`

Command	Description
`composer remove vendor/package`	Removes `vendor/package` from composer.json and uninstalls it

This command changes both the composer.json and composer.lock files.