Error "class Domdocument not found" when trying to run Phpunit

Question

When trying to turn the command phpunit on the command line, I received the following error:

Class 'Domdocument' not found

This wasn’t happening before. I remember having removed and installed PHP again.

What can cause this error, since DomDocument is a native PHP class?

Note: I am using Ubuntu operating system.

Answer 1

Some Linux distributions separate the DOM extension into another package to make the installation cleaner and more organized.

I don’t remember the name of the package in Ubuntu, but it’s something similar to php-xml. After installing, make sure the extension is active in php.

You can check by looking through phpinfo();

If not active, just add the extension to your php.ini:

extension=dom.so

Answer 2

To install in Ubuntu I think this is the command, if it is php5.6:

sudo apt-get install php5.6-xml

Other linux based on Debian or older versions of Ubuntu I think works like this:

sudo apt-get install php5-dom

If it’s the 7.0 it would be this:

sudo apt-get install php7.0-xml

php7.1:

sudo apt-get install php7.1-xml

The only thing that can change is if you are using via PPA, so it will depend on how you installed it

Answer 3

For those using Phpunit, a good check in addition to seeing if the php-xml is installed and active, is to call Domdocument after namespace declaration:

namespace SeuNameSpace\SeuNameSpace;

use DOMDocument; //<--- aqui
use PHPUnit\Framework\TestCase;