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## 安装 `install`
The `install` command reads the `composer.json` file from the current
directory, resolves the dependencies, and installs them into `vendor`.
`install` 命令从当前目录读取 `composer.json` 文件，处理了依赖关系，并把其安装到 `vendor` 目录下。
$ php composer.phar install
If there is a `composer.lock` file in the current directory, it will use the
exact versions from there instead of resolving them. This ensures that
everyone using the library will get the same versions of the dependencies.
如果当前目录下存在 `composer.lock` 文件，它会从此文件读取依赖版本，而不是根据 `composer.json` 文件去获取依赖。这确保了该库的每个使用者都能得到相同的依赖版本。
If there is no `composer.lock` file, composer will create one after dependency
resolution.
如果没有 `composer.lock` 文件，composer 将在处理完依赖关系后创建它。
### 安装选项
* **--prefer-source:** There are two ways of downloading a package: `source`
and `dist`. For stable versions composer will use the `dist` by default.
The `source` is a version control repository. If `--prefer-source` is
enabled, composer will install from `source` if there is one. This is
useful if you want to make a bugfix to a project and get a local git
clone of the dependency directly.
* **--prefer-dist:** Reverse of `--prefer-source`, composer will install
from `dist` if possible. This can speed up installs substantially on build
servers and other use cases where you typically do not run updates of the
vendors. It is also a way to circumvent problems with git if you do not
have a proper setup.
* **--prefer-source:** 下载包的方式有两种： `source`
和 `dist`。对于稳定版本 composer 将默认使用 `dist` 方式。而 `source` 表示版本控制源 。如果 `--prefer-source` 是被启用的，composer 将从 `source` 安装（如果有的话）。如果想要使用一个 bugfix 到你的项目，这是非常有用的。并且可以直接从本地的版本库直接获取依赖关系。
* **--prefer-dist:** 与 `--prefer-source` 相反，composer 将尽可能的从 `dist` 获取，这将大幅度的加快在 build servers 上的安装。这也是一个回避 git 问题的途径，如果你清楚任何正确的设置。
* **--dry-run:** If you want to run through an installation without actually
installing a package, you can use `--dry-run`. This will simulate the
installation and show you what would happen.