我使用的是 ubuntu 16.04，laravel 5.2当我在我的项目目录中运行更新作曲家时，它的显示您的系统中缺少请求的 PHP 扩展 dom"我检查了已安装的 PHP 包，它在那里可用

I am using ubuntu 16.04, laravel 5.2 when i run update composer in my project directory its showing "the requested PHP extension dom is missing from your system" i checked installed packages of PHP, its available there

推荐答案

安装xml-extension(我的例子是php7.0-xml)解决了问题

Installing xml-extension (php7.0-xml in my case) solved the problem

sudo apt-get install php-xml