无法安装 php 包

Question

我从 GitHub 克隆了一个项目，并尝试使用我安装的 Composer 安装包，没有出现任何问题。我运行作曲家安装。不幸的是，我遇到了这些我无法弄清楚的错误，我该怎么办？

    Loading composer repositories with package information

Installing dependencies (including require-dev) from lock file

Your requirements could not be resolved to an installable set of packages.

  Problem 1

    - Installation request for tijsverkoyen/css-to-inline-styles 2.2.2 -> satisfiable by tijsverkoyen/css-to-inline-styles[2.2.2].

    - tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  Problem 2

    - Installation request for phar-io/manifest 1.0.3 -> satisfiable by phar-io/manifest[1.0.3].

    - phar-io/manifest 1.0.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  Problem 3

    - Installation request for phpunit/php-code-coverage 7.0.10 -> satisfiable by phpunit/php-code-coverage[7.0.10].

    - phpunit/php-code-coverage 7.0.10 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  Problem 4

    - Installation request for phpunit/phpunit 8.5.4 -> satisfiable by phpunit/phpunit[8.5.4].

    - phpunit/phpunit 8.5.4 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  Problem 5

    - Installation request for theseer/tokenizer 1.1.3 -> satisfiable by theseer/tokenizer[1.1.3].

    - theseer/tokenizer 1.1.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.

  Problem 6

    - tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.

    - laravel/framework v7.10.2 requires tijsverkoyen/css-to-inline-styles ^2.2.2 -> satisfiable by tijsverkoyen/css-to-inline-styles[2.2.2].

    - Installation request for laravel/framework v7.10.2 -> satisfiable by laravel/framework[v7.10.2].

  To enable extensions, verify that they are enabled in your .ini files:

  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Answer 1

在 Ubuntu 上安装过程中出现问题。我添加了这个 php 扩展并且它起作用了。sudo apt-get install php-xml