How to use DOMDocument in yii2?

Question

Yii

Hello.
I wanted to use the DOMDocument class:
$dom = new DOMDocument();
As a result, I received an error that the class was not found.
Class 'app\controllers\DOMDocument' not found
Can you please tell me how it could be connected and used in yii2?
Version: 2.0.6

Answer 1

Solution:
1) Either add to DOMDocument import,

use ...
use DOMDocument;

class Controller ....

2) Or, when called, refer to it as a global class:
$dom = new \DOMDocument();