PHP Composer 不会在 php 5.6 中安装 Drush：phpunit/phpunit 4.8.x 需要 ext-dom

【问题标题】：PHP Composer Won't install Drush with php 5.6: phpunit/phpunit 4.8.x requires ext-domPHP Composer 不会在 php 5.6 中安装 Drush：phpunit/phpunit 4.8.x 需要 ext-dom
【发布时间】：2026-02-13 19:05:01
【问题描述】：

所以我正在开发 CentOs 7，并且我一直在尝试创建一个有效的 Drupal Composer 模板 (https://github.com/drupal-composer/drupal-project)，其中包括站点本地 Drush 安装 (http://docs.drush.org/en/master/install/)。对于我们的项目，我们需要使用 PHP 5.6 和 Drupal 8.2。

按照上面的说明，我在 CentOS 的全新 virtualbox 安装中完成了以下操作：

已安装 git。

已安装 php 5.6：

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm 
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm 

yum install php56w php56w-opcache

现在我下载 composer 并全局安装：

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" 
php -r "if (hash_file('SHA384', 'composer-setup.php') === '669656bab3166a7aff8a7506b8cb2d1c292f042046c5a994c43155c0be6190fa0355160742ab2e1c88d40d5be660b410') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" 
php composer-setup.php 

mv composer.phar /usr/local/bin/compose

我可以运行 composer，它似乎工作正常。

现在根据 Drupal Composer 的说明，我们可以使用 composer 创建我们的 drupal 项目：

composer create-project drupal-composer/drupal-project:8.x-dev some-dir --stability dev --no-interaction

项目模板构建。

但是，我的问题是我无法运行

composer require drush/drush

或

composer update

因为我收到这些错误：

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

Problem 1
  - phpunit/phpunit 4.8.x-dev requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.9 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.8 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.7 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.6 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.5 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.4 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.35 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.34 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.33 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.32 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.31 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.30 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.29 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.28 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.27 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.26 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.25 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.24 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.23 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.22 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.21 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.20 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.19 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.18 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.17 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.16 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.15 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.14 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.13 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.12 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.11 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.10 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.1 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - phpunit/phpunit 4.8.0 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  - Installation request for phpunit/phpunit ~4.8 -> satisfiable by phpunit/phpunit[4.8.0, 4.8.1, 4.8.10, 4.8.11, 4.8.12, 4.8.13, 4.8.14, 4.8.15, 4.8.16, 4.8.17, 4.8.18, 4.8.19, 4.8.2, 4.8.20, 4.8.21, 4.8.22, 4.8.23, 4.8.24, 4.8.25, 4.8.26, 4.8.27, 4.8.28, 4.8.29, 4.8.3, 4.8.30, 4.8.31, 4.8.32, 4.8.33, 4.8.34, 4.8.35, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.8.9, 4.8.x-dev].

To enable extensions, verify that they are enabled in your .ini files:
  - /etc/php.ini
  - /etc/php.d/bz2.ini
  - /etc/php.d/calendar.ini
  - /etc/php.d/ctype.ini
  - /etc/php.d/curl.ini
  - /etc/php.d/exif.ini
  - /etc/php.d/fileinfo.ini
  - /etc/php.d/ftp.ini
  - /etc/php.d/gettext.ini
  - /etc/php.d/gmp.ini
  - /etc/php.d/iconv.ini
  - /etc/php.d/json.ini
  - /etc/php.d/opcache.ini
  - /etc/php.d/phar.ini
  - /etc/php.d/shmop.ini
  - /etc/php.d/simplexml.ini
  - /etc/php.d/sockets.ini
  - /etc/php.d/tokenizer.ini
  - /etc/php.d/xml.ini
  - /etc/php.d/zip.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Composer 拒绝更新。 经过几天的谷歌搜索，我似乎不知所措。我不知道我到底需要在这些文件中更改什么，而且我没有看到任何人在下载作曲家时遇到同样的错误（而且大多数帖子似乎已经过时多年了）。

任何人都可以就我在这里遗漏的内容提供任何见解吗？

谢谢。

编辑：感谢@Oliver，我发现问题是我需要为 php5.6 安装的 php-xml：

sudo yum install php56w-xml

可以在他评论中的链接中找到扩展名。

现在我正在弄清楚该怎么做，因为我没有看到该网站上列出的 drupal/core 或 easyrdf。我的新错误在这里：

  DrupalProject\composer\ScriptHandler::checkComposerVersion
  Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Your requirements could not be resolved to an installable set of packages.

Problem 1
  - drupal/core 8.0.0 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta10 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta11 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta12 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta13 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta14 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta15 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta16 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta6 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta7 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta8 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-beta9 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-rc1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-rc2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-rc3 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.0-rc4 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.3 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.4 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.5 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.6 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.0.x-dev requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.0 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.0-beta1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.0-beta2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.0-rc1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.10 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.3 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.4 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.5 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.6 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.7 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.8 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.9 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.1.x-dev requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0-beta1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0-beta2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0-beta3 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0-rc1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.0-rc2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.3 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.4 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.5 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.6 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.7 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.2.x-dev requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.3.0-alpha1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.3.0-beta1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.3.0-rc1 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.3.0-rc2 requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.3.x-dev requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - drupal/core 8.4.x-dev requires easyrdf/easyrdf 0.9.* -> satisfiable by easyrdf/easyrdf[0.9.0, 0.9.0-rc.1, 0.9.0-rc.2, 0.9.0-rc.3, 0.9.0-rc.4, 0.9.0-rc.5, 0.9.1, 0.9.x-dev].
  - easyrdf/easyrdf 0.9.x-dev requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0-rc.5 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0-rc.4 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0-rc.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0-rc.2 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0-rc.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - easyrdf/easyrdf 0.9.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  - Installation request for drupal/core ~8.0 -> satisfiable by drupal/core[8.0.0, 8.0.0-beta10, 8.0.0-beta11, 8.0.0-beta12, 8.0.0-beta13, 8.0.0-beta14, 8.0.0-beta15, 8.0.0-beta16, 8.0.0-beta6, 8.0.0-beta7, 8.0.0-beta8, 8.0.0-beta9, 8.0.0-rc1, 8.0.0-rc2, 8.0.0-rc3, 8.0.0-rc4, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.x-dev, 8.1.0, 8.1.0-beta1, 8.1.0-beta2, 8.1.0-rc1, 8.1.1, 8.1.10, 8.1.2, 8.1.3, 8.1.4, 8.1.5, 8.1.6, 8.1.7, 8.1.8, 8.1.9, 8.1.x-dev, 8.2.0, 8.2.0-beta1, 8.2.0-beta2, 8.2.0-beta3, 8.2.0-rc1, 8.2.0-rc2, 8.2.1, 8.2.2, 8.2.3, 8.2.4, 8.2.5, 8.2.6, 8.2.7, 8.2.x-dev, 8.3.0-alpha1, 8.3.0-beta1, 8.3.0-rc1, 8.3.0-rc2, 8.3.x-dev, 8.4.x-dev].

To enable extensions, verify that they are enabled in your .ini files:
  - /etc/php.ini
  - /etc/php.d/bz2.ini
  - /etc/php.d/calendar.ini
  - /etc/php.d/ctype.ini
  - /etc/php.d/curl.ini
  - /etc/php.d/dom.ini
  - /etc/php.d/exif.ini
  - /etc/php.d/fileinfo.ini
  - /etc/php.d/ftp.ini
  - /etc/php.d/gettext.ini
  - /etc/php.d/gmp.ini
  - /etc/php.d/iconv.ini
  - /etc/php.d/json.ini
  - /etc/php.d/opcache.ini
  - /etc/php.d/phar.ini
  - /etc/php.d/shmop.ini
  - /etc/php.d/simplexml.ini
  - /etc/php.d/sockets.ini
  - /etc/php.d/tokenizer.ini
  - /etc/php.d/xml.ini
  - /etc/php.d/xml_wddx.ini
  - /etc/php.d/xmlreader.ini
  - /etc/php.d/xmlwriter.ini
  - /etc/php.d/xsl.ini
  - /etc/php.d/zip.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

如果确定将发布更新。

最终编辑：发现easyrdf 需要ext-mbstring 和ext-pcre。 ext-pcre 是随普通 php 包一起安装的，所以我只需要 ext-mbstring:

sudo yum install php56w-mbstring

现在在调用 composer update 时，我的所有依赖项都已下载！现在我可以运行 vender/bin/drush 并且该命令有效，确认我的本地安装已完成！

【问题讨论】：

    标签： php dom drupal composer-php drush


    【解决方案1】：

    这与作曲家无关。你只是缺少一个 php 扩展。 我不知道你有什么 php 版本或你的服务器上的操作系统是什么。我发布了一些 bash 的示例：

    编辑：现在我找到了你的版本：

    CentOS-示例：

    sudo yum install php56w-xml

    您可以在此处找到 php 5.6 的软件包列表：https://webtatic.com/packages/php56/

    【讨论】：

    • 您好，感谢您的回答。我正在使用 php 5.6，我在 CentOS 上。我以前看过这个建议，但是当我尝试 sudo yum install php-xml 时出现冲突错误。尝试使用 yum --showduplicates list php-xml 查找 5.6 的版本expand 没有提出任何其他版本，我似乎无法在网上其他任何地方找到关于如何找到 php 5.6 的确切扩展的解决方案。谢谢！
    • 我已将我的答案更改为您的版本。 php56w-xml 应该这样做
    • 谢谢@Oliver！这似乎必须解决 phpunit 问题！现在我遇到了同样的问题，但它现在说 drupal/core 需要 easyrdf，但至少它向前迈出了一步！看起来我将不得不继续安装正确的 php 扩展，直到依赖关系得到满足。我会看看我能找到什么，再次感谢。
    • 不客气。我在答案中添加了指向扩展列表的链接。喜欢就用吧
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