此扩展需要 libxml PHP 扩展。这表示需要使用 --enable-libxml ，尽管这将隐式完成因为 libxml 是缺省开启的。
david at brayworth dot com dot au (2011-06-12 17:55:37)
Under Fedora packaging ssystems you will need php-xml
=> yum install php-xml
James (2010-04-18 10:58:36)
You also need to check libxml is installed. Check phpinfo() > Dom to see if it is. Bug report filed to get this added here.