update cn-introduction/03-cli.md
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* **--prefer-source:** 下载包的方式有两种： `source`
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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。
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* **--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。
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* **--dry-run:** If you want to run through an installation without actually
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installing a package, you can use `--dry-run`. This will simulate the
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installation and show you what would happen.
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* **--dev:** Install packages listed in `require-dev` (this is the default behavior).
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* **--no-dev:** Skip installing packages listed in `require-dev`.
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* **--no-scripts:** Skips execution of scripts defined in `composer.json`.
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* **--no-plugins:** Disables plugins.
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* **--no-progress:** Removes the progress display that can mess with some
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terminals or scripts which don't handle backspace characters.
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* **--optimize-autoloader (-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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* **--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，如果你不清楚如何正确的设置。
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* **--dry-run:** 如果你只是想演示而并非实际安装一个包，你可以运行 `--dry-run` 命令，它将模拟安装并显示将会发生什么。
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* **--dev:** 安装 `require-dev` 字段中列出的包（这是一个默认值）。
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* **--no-dev:** 跳过 `require-dev` 字段中列出的包。
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* **--no-scripts:** 跳过 `composer.json` 文件中定义的脚本。
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* **--no-plugins:** 关闭 plugins。
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* **--no-progress:** 移除进度信息，这可以避免一些不处理换行的终端或脚本出现混乱的显示。
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* **--optimize-autoloader (-o):** 转换 PSR-0 autoloading 到 classmap 可以获得更快的加载支持。特别是在生产环境下建议这么做，但由于运行需要一些时间，因此并没有作为默认值。
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## 更新 `update`
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In order to get the latest versions of the dependencies and to update the
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`composer.lock` file, you should use the `update` command.
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为了获取依赖的最新版本，并且升级 `composer.lock` 文件，你应该使用 `update` 命令。
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$ php composer.phar update
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This will resolve all dependencies of the project and write the exact versions
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into `composer.lock`.
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这将解决项目的所有依赖，并将确切的版本号写入 `composer.lock`。
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If you just want to update a few packages and not all, you can list them as such:
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如果你只是想更新几个包，你可以像这样分别列出它们：
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$ php composer.phar update vendor/package vendor/package2
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You can also use wildcards to update a bunch of packages at once:
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你还可以使用通配符进行批量更新：
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$ php composer.phar update vendor/*
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### 更新选项
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* **--prefer-source:** Install packages from `source` when available.
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* **--prefer-dist:** Install packages from `dist` when available.
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* **--dry-run:** Simulate the command without actually doing anything.
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* **--dev:** Install packages listed in `require-dev` (this is the default behavior).
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* **--no-dev:** Skip installing packages listed in `require-dev`.
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* **--no-scripts:** Skips execution of scripts defined in `composer.json`.
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* **--no-plugins:** Disables plugins.
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* **--no-progress:** Removes the progress display that can mess with some
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terminals or scripts which don't handle backspace characters.
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* **--optimize-autoloader (-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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* **--lock:** Only updates the lock file hash to suppress warning about the
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lock file being out of date.
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* **--with-dependencies** Add also all dependencies of whitelisted packages to the whitelist.
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So all packages with their dependencies are updated recursively.
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* **--prefer-source:** 当有可用的包时，从 `source` 安装。
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* **--prefer-dist:** 当有可用的包时，从 `dist` 安装。
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* **--dry-run:** 模拟命令，并没有做实际的操作。
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* **--dev:** 安装 `require-dev` 字段中列出的包（这是一个默认值）。
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* **--no-dev:** 跳过 `require-dev` 字段中列出的包。
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* **--no-scripts:** 跳过 `composer.json` 文件中定义的脚本。
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* **--no-plugins:** 关闭 plugins。
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* **--no-progress:** 移除进度信息，这可以避免一些不处理换行的终端或脚本出现混乱的显示。
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* **--optimize-autoloader (-o):** 转换 PSR-0 autoloading 到 classmap 可以获得更快的加载支持。特别是在生产环境下建议这么做，但由于运行需要一些时间，因此并没有作为默认值。
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* **--lock:** 仅更新 lock 文件的 hash，取消有关 lock 文件过时的警告。
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* **--with-dependencies** 同时更新白名单内包的依赖关系，这将进行递归更新。
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## 申明依赖 `require`
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The `require` command adds new packages to the `composer.json` file from
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the current directory.
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`require` 命令增加新的依赖包到当前目录的 `composer.json` 文件中。
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$ php composer.phar require
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After adding/changing the requirements, the modified requirements will be
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installed or updated.
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在添加或改变依赖时， 修改后的依赖关系将被安装或者更新。
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If you do not want to choose requirements interactively, you can just pass them
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to the command.
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如果你不希望通过交互来指定依赖包，你可以在这条令中直接指明依赖包。
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$ php composer.phar require vendor/package:2.* vendor/package2:dev-master
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### 申明依赖的选项
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* **--prefer-source:** Install packages from `source` when available.
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* **--prefer-dist:** Install packages from `dist` when available.
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* **--dev:** Add packages to `require-dev`.
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* **--no-update:** Disables the automatic update of the dependencies.
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* **--no-progress:** Removes the progress display that can mess with some
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terminals or scripts which don't handle backspace characters.
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* **--prefer-source:** 当有可用的包时，从 `source` 安装。
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* **--prefer-dist:** 当有可用的包时，从 `dist` 安装。
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* **--dev:** 安装 `require-dev` 字段中列出的包。
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* **--no-update:** 禁用依赖关系的自动更新。
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* **--no-progress:** 移除进度信息，这可以避免一些不处理换行的终端或脚本出现混乱的显示。
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## global
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