我正在尝试使用 Composer 更新我的 yii2 项目，但是每当我发出更新命令时，它都会显示以下错误。
我们的要求无法解析为可安装的软件包集。
- phpunit/phpunit 5.6.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
To enable extensions, verify that they are enabled in your .ini files:
- /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/15-xml.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-curl.ini
- /etc/php/7.2/cli/conf.d/20-dom.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-gd.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-mbstring.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-simplexml.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
- /etc/php/7.2/cli/conf.d/20-wddx.ini
- /etc/php/7.2/cli/conf.d/20-xml.ini
- /etc/php/7.2/cli/conf.d/20-xmlreader.ini
- /etc/php/7.2/cli/conf.d/20-xmlwriter.ini
- /etc/php/7.2/cli/conf.d/20-xsl.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
当我输入php --ini
在命令行中，我得到了这个结果。
/etc/php/7.2/cli/php.ini
当我打开此文件时，我得到的是一个空文件。但phpinfo()显示了此结果。
/etc/php5/apache2/php.ini
我尝试添加extension=dom.so此文件
/etc/php5/apache2/php.ini
作曲家仍然显示同样的错误
答案1
这个扩展名是“xml”，而不是“dom”。
sudo apt-get install php-xml
或者
sudo apt-get install php7.2-xml
取决于 Ubuntu 版本和使用的存储库。