如何使用 Composer 添加/更新特定包？我也在使用最新的 Laravel，不确定它是否重要，但任何可以帮助确定答案的东西。
我还从我发现的旧 Stackoverflow 帖子中尝试了以下内容，但它对我不起作用。它将包附加到composer.json，然后继续更新所有内容。链接在这里：如何使用 Composer 更新单个库？ https://stackoverflow.com/questions/16739998/symfony2-how-to-update-a-single-library-with-composer-phar
这是我尝试添加到我的项目中的包：https://github.com/barryvdh/laravel-dompdf https://github.com/barryvdh/laravel-dompdf
非常感谢您的时间和帮助！
Edit:
要求和更新不起作用，他们也会更新所有内容。是否有可能我运行的命令不正确？说到作曲家，我还是一头雾水：S
$ composer require barryvdh/laravel-dompdf
lease provide a version constraint for the barryvdh/laravel-dompdf requirement: *
/composer.json has been updated
oading composer repositories with package information
pdating dependencies (including require-dev)
- Removing orchestra/testbench (v2.1.1)
- Removing symfony/security (v2.4.3)
- Removing symfony/translation (v2.4.3)
- Installing symfony/translation (v2.4.6)
Loading from cache
- Removing symfony/http-foundation (v2.4.3)
- Installing symfony/http-foundation (v2.4.6)
Loading from cache
- Removing symfony/event-dispatcher (v2.4.3)
- Installing symfony/event-dispatcher (v2.5.0)
Loading from cache
- Removing symfony/debug (v2.4.3)
- Installing symfony/debug (v2.4.6)
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- Removing symfony/http-kernel (v2.4.3)
- Installing symfony/http-kernel (v2.4.6)
Loading from cache
- Removing symfony/routing (v2.4.3)
- Installing symfony/routing (v2.4.6)
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- Removing symfony/process (v2.4.3)
- Installing symfony/process (v2.4.6)
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- Removing symfony/finder (v2.4.3)
- Installing symfony/finder (v2.4.6)
Loading from cache
- Removing symfony/dom-crawler (v2.4.3)
- Installing symfony/dom-crawler (v2.4.6)
Loading from cache
- Removing symfony/css-selector (v2.4.3)
- Installing symfony/css-selector (v2.4.6)
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- Removing symfony/console (v2.4.3)
- Installing symfony/console (v2.4.6)
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- Removing symfony/browser-kit (v2.4.3)
- Installing symfony/browser-kit (v2.4.6)
Loading from cache
- Removing swiftmailer/swiftmailer (v5.1.0)
- Installing swiftmailer/swiftmailer (v5.2.0)
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- Removing stack/builder (v1.0.1)
- Installing stack/builder (v1.0.2)
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- Removing patchwork/utf8 (v1.1.21)
- Installing patchwork/utf8 (v1.1.23)
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- Removing nesbot/carbon (1.8.0)
- Installing nesbot/carbon (1.9.0)
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- Removing monolog/monolog (1.9.0)
- Installing monolog/monolog (1.10.0)
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- Removing symfony/filesystem (v2.4.3)
- Installing symfony/filesystem (v2.5.0)
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- Installing symfony/security-core (v2.4.6)
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- Removing laravel/framework (v4.1.28)
- Installing laravel/framework (v4.1.30)
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- Removing chumper/datatable (2.2.2)
- Installing chumper/datatable (2.3)
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- Removing ivaynberg/select2 (3.4.6)
- Installing ivaynberg/select2 (3.4.8)
Loading from cache
- Installing phenx/php-font-lib (0.2.2)
Loading from cache
- Installing dompdf/dompdf (v0.6.1)
Loading from cache
- Installing barryvdh/laravel-dompdf (v0.3.1)
Loading from cache
symfony/security-core suggests installing symfony/validator (For using the user password constraint)
symfony/security-core suggests installing symfony/expression-language (For using the expression voter)
Generating autoload files
Compiling component files
Generating optimized class loader
我尝试了以下方法，它似乎对我有用。
你必须首先添加barryvdh/laravel-dompdf to the composer.json文件。然后执行以下操作：
composer update barryvdh/laravel-dompdf --lock
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