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### 打印自动加载索引-参数
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* **--optimize (-o):** Convert PSR-0 autoloading to classmap to get a faster
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autoloader. This is recommended especially for production, but can take
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a bit of time to run so it is currently not done by default.
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* **--optimize (-o):** 转换 PSR-0 autoloading 到 classmap 获得更快的载入速度。这特别适用于生产环境，但可能需要一些时间来运行，因此它目前不是默认设置。
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## licenses
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## 查看许可协议 `licenses`
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Lists the name, version and license of every package installed. Use
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`--format=json` to get machine readable output.
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列出已安装的每个包的名称、版本、许可协议。可以使用 `--format=json` 参数来获取 JSON 格式的输出。
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## run-script
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## 执行脚本 `run-script`
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To run [scripts](articles/scripts.md) manually you can use this command,
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just give it the script name and optionally --no-dev to disable the dev mode.
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你可以运行此命令来手动执行 [脚本](articles/scripts.md)，只需要指定脚本的名称，可选的 `--no-dev` 参数允许你禁用开发者模式。
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## diagnose
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If you think you found a bug, or something is behaving strangely, you might
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want to run the `diagnose` command to perform automated checks for many common
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problems.
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如果你觉得发现了一个 bug 或是程序行为变得怪异，你可能需要运行 `diagnose` 命令，来帮助你检测一些常见的问题。
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$ php composer.phar diagnose
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## archive
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## 归档 `archive`
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This command is used to generate a zip/tar archive for a given package in a
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given version. It can also be used to archive your entire project without
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excluded/ignored files.
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此命令用来对指定包的指定版本进行 zip/tar 归档。它也可以用来归档你的整个项目，不包括 excluded/ignored（排除/忽略）的文件。
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$ php composer.phar archive vendor/package 2.0.21 --format=zip
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### Options
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### 归档-参数
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* **--format (-f):** Format of the resulting archive: tar or zip (default:
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"tar")
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* **--dir:** Write the archive to this directory (default: ".")
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* **--format (-f):** 指定归档格式：tar 或 zip（默认为 tar）。
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* **--dir:** 指定归档存放的目录（默认为当前目录）。
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## help
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## 获取帮助信息 `help`
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To get more information about a certain command, just use `help`.
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使用 `help` 可以获取指定命令的帮助信息。
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$ php composer.phar help install
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## Environment variables
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## 环境变量
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You can set a number of environment variables that override certain settings.
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Whenever possible it is recommended to specify these settings in the `config`
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section of `composer.json` instead. It is worth noting that the env vars will
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always take precedence over the values specified in `composer.json`.
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你可以设置一些环境变量来覆盖默认的配置。建议尽可能的在 `composer.json` 的 `config` 字段中设置这些值，而不是通过命令行设置环境变量。值得注意的是环境变量中的值，将始终优先于 `composer.json` 中所指定的值。
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### COMPOSER
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By setting the `COMPOSER` env variable it is possible to set the filename of
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`composer.json` to something else.
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环境变量 `COMPOSER` 可以为 `composer.json` 文件指定其它的文件名。
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For example:
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例如：
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$ COMPOSER=composer-other.json php composer.phar install
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### COMPOSER_ROOT_VERSION
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By setting this var you can specify the version of the root package, if it can
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not be guessed from VCS info and is not present in `composer.json`.
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通过设置这个环境变量，你可以指定 root 包的版本，如果程序不能从 VCS 上猜测出版本号，并且未在 `composer.json` 文件中申明。
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### COMPOSER_VENDOR_DIR
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By setting this var you can make composer install the dependencies into a
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directory other than `vendor`.
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通过设置这个环境变量，你可以指定 composer 将依赖安装在 `vendor` 以外的其它目录中。
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### COMPOSER_BIN_DIR
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By setting this option you can change the `bin` ([Vendor Binaries](articles/vendor-binaries.md))
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directory to something other than `vendor/bin`.
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通过设置这个环境变量，你可以指定 `bin`（[Vendor Binaries](articles/vendor-binaries.md)）目录到 `vendor/bin` 以外的其它目录。
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### http_proxy or HTTP_PROXY
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If you are using composer from behind an HTTP proxy, you can use the standard
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`http_proxy` or `HTTP_PROXY` env vars. Simply set it to the URL of your proxy.
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Many operating systems already set this variable for you.
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如果你是通过 HTTP 代理来使用 Composer，你可以使用 `http_proxy` 或 `HTTP_PROXY` 环境变量。只要简单的将它设置为代理服务器的 URL。许多操作系统已经为你的服务设置了此变量。
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Using `http_proxy` (lowercased) or even defining both might be preferable since
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some tools like git or curl will only use the lower-cased `http_proxy` version.
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Alternatively you can also define the git proxy using
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`git config --global http.proxy <proxy url>`.
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建议使用 `http_proxy`（小写）或者两者都进行定义。因为某些工具，像 git 或 curl 将使用 `http_proxy` 小写的版本。另外，你还可以使用 `git config --global http.proxy <proxy url>` 来单独设置 git 的代理。
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### no_proxy
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