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

PHP 7.0:

• Ubuntu: apt-get install php7.0-xml
• CentOS / Fedora / Red Hat: yum install php70w-xml

PHP 7.1:

• Ubuntu: apt-get install php7.1-xml
• CentOS / Fedora / Red Hat: yum install php71w-xml

PHP 7.2:

• Ubuntu: apt-get install php7.2-xml
• CentOS / Fedora / Red Hat: yum install php72w-xml

PHP 7.3:

• Ubuntu: apt-get install php7.3-xml
• CentOS / Fedora / Red Hat: yum install php73w-xml

PHP 7.4:

• Ubuntu: apt-get install php7.4-xml
• CentOS / Fedora / Red Hat: yum install php74w-xml

Answer 2

After a long time suffering from it in PHPunit...

For those using namespace, which is very common with Frameworks or CMS, a good check in addition to seeing if php-xml is installed and active, is to remember to declare the DOMDocument after the namespace:

namespace YourNameSpace\YourNameSpace;

use DOMDocument; //<--- here, check this!

Answer 3

This help for me (Ubuntu Linux) PHP 5.6.3

sudo apt-get install php5.6-dom

Thats work for me.

Answer 4

If compiling from source with --disable-all then DOMDocument support can be enabled with
--enable-dom

Example:

./configure --disable-all --enable-dom

Tested and working for Centos7 and PHP7