Class 'DOMDocument' not found

Question

I\'ve found an error on a page in my Magento application; it always show this message error when I visit it:

Fatal error: Class \'DOMDocument\' not fo

Answer 1

PHP7: the latest version:

sudo apt-get install php7.1-xml

you can also do:

sudo apt-get install php-dom

and apt-get will show you where it is