Laravel Composer 安装失败并在 ubuntu 中出现错误

Question

使用包信息加载 Composer 存储库 从锁定文件安装依赖项（包括 require-dev） 您的需求无法解析为一组可安装的包。

问题 1 - aws/aws-sdk-php 3.75.0 的安装请求 -> aws/aws-sdk-php[3.75.0] 可满足。

- aws/aws-sdk-php 3.75.0 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.

问题 2 - erusev/parsedown 1.7.1 的安装请求 -> erusev/parsedown[1.7.1] 可满足。

- erusev/parsedown 1.7.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

问题 3 - laravel/framework v5.5.43 的安装请求 -> laravel/framework[v5.5.43] 可满足。

- laravel/framework v5.5.43 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

问题 4 - League/csv 9.1.4 的安装请求 -> League/csv[9.1.4] 可满足。

- league/csv 9.1.4 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

问题 5 - nicolaslopezj/searchable 1.10.3 的安装请求 -> nicolaslopezj/searchable[1.10.3] 可满足。

- nicolaslopezj/searchable 1.10.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

问题 6 - phpoffice/phpexcel 1.8.1 的安装请求 -> phpoffice/phpexcel[1.8.1] 可满足。

- phpoffice/phpexcel 1.8.1 requires ext-xml * -> the requested PHP extension xml is missing from your system.

问题 7 - phar-io/manifest 1.0.1 的安装请求 -> phar-io/manifest[1.0.1] 可满足。

- phar-io/manifest 1.0.1 requires ext-dom * -> the requested PHP extension dom is missing from your system.

问题 8 - phpunit/php-code-coverage 5.3.2 的安装请求 -> phpunit/php-code-coverage[5.3.2] 可满足。- phpunit/php-code-coverage 5.3.2 需要 ext-dom * -> 系统中缺少请求的 PHP 扩展 dom。

问题 9 - phpunit/phpunit 6.5.13 的安装请求 -> phpunit/phpunit[6.5.13] 可满足。

- phpunit/phpunit 6.5.13 requires ext-dom * -> the requested PHP extension dom is missing from your system.

问题 10 - 这些er/tokenizer 1.1.0 的安装请求 -> 这些er/tokenizer[1.1.0] 可满足。

- theseer/tokenizer 1.1.0 requires ext-dom * -> the requested PHP extension dom is missing from your system.

问题 11 - aws/aws-sdk-php 3.75.0 需要 ext-simplexml * -> 系统中缺少请求的 PHP 扩展 simplexml。

- league/flysystem-aws-s3-v3 1.0.21 requires aws/aws-sdk-php ^3.0.0 -> satisfiable by aws/aws-sdk-php[3.75.0].

- Installation request for league/flysystem-aws-s3-v3 1.0.21 -> satisfiable by league/flysystem-aws-s3-v3[1.0.21].

要启用扩展，请验证它们是否在您的 .ini 文件中启用： - /etc/php/7.2/cli/php.ini

- /etc/php/7.2/cli/conf.d/10-opcache.ini

- /etc/php/7.2/cli/conf.d/10-pdo.ini

- /etc/php/7.2/cli/conf.d/20-calendar.ini

- /etc/php/7.2/cli/conf.d/20-ctype.ini

- /etc/php/7.2/cli/conf.d/20-exif.ini

- /etc/php/7.2/cli/conf.d/20-fileinfo.ini

- /etc/php/7.2/cli/conf.d/20-ftp.ini

- /etc/php/7.2/cli/conf.d/20-gettext.ini

- /etc/php/7.2/cli/conf.d/20-iconv.ini

- /etc/php/7.2/cli/conf.d/20-json.ini

- /etc/php/7.2/cli/conf.d/20-phar.ini

- /etc/php/7.2/cli/conf.d/20-posix.ini

- /etc/php/7.2/cli/conf.d/20-readline.ini

- /etc/php/7.2/cli/conf.d/20-shmop.ini

- /etc/php/7.2/cli/conf.d/20-sockets.ini

- /etc/php/7.2/cli/conf.d/20-sysvmsg.ini

- /etc/php/7.2/cli/conf.d/20-sysvsem.ini

- /etc/php/7.2/cli/conf.d/20-sysvshm.ini

- /etc/php/7.2/cli/conf.d/20-tokenizer.ini

您还可以php --ini在终端内运行以查看 PHP 在 CLI 模式下使用了哪些文件。

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这个错误是什么意思？我上面提到的所有扩展都可用并在我的 php.ini 中启用。

Answer 1

尝试运行：

sudo apt install php7.2-mbstring php7.2-xml

您的系统中缺少这些扩展和/或它们未配置为使用 php 启用。这将在您的php.ini文件中安装并启用它们。