Php 通过终端错误更新Digital Ocean Ubuntu中的Composer

我正在使用mac，在命令行中，我登录到服务器，并希望安装composer，但我遇到了一些问题（请参见下文）。我不需要PHP单元，所以我也尝试了

composer安装——没有开发人员

，但是出现了相同的错误。有什么想法或解决办法吗

Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. It is recommended that you run `composer update` or `composer update <package name>`.
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
    - tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - laravel/framework v7.3.0 requires tijsverkoyen/css-to-inline-styles ^2.2.2 -> satisfiable by tijsverkoyen/css-to-inline-styles[2.2.2].
    - Installation request for laravel/framework v7.3.0 -> satisfiable by laravel/framework[v7.3.0].

---

错误消息说您缺少PHP扩展名

extDOM

您需要通过运行

sudo apt install php xml

来安装它

Problem 1
    - phpunit/phpunit 8.5.x-dev requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - phpunit/phpunit 8.5.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - phpunit/phpunit 8.5.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - phpunit/phpunit 8.5.1 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - phpunit/phpunit 8.5.0 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - Installation request for phpunit/phpunit ^8.5 -> satisfiable by phpunit/phpunit[8.5.0, 8.5.1, 8.5.2, 8.5.3, 8.5.x-dev].