Why does Class 'HTMLPurifier_Config' not found error occur?

Question

Yii

Yii2
Error occurs - Class 'HTMLPurifier_Config' not found
Due to asHTML modifier - 'format' => ['html'],
Here is the template where the error occurs
<?=GridView::widget([
'dataProvider' => $dataProvider,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
[
'class' => DataColumn::className(),
'attribute' => 'name',
'label' => 'Role '
],
[
'class' => DataColumn::className(),
'label' => 'Permissions',
'format' => ['html'], // An error occurs due to the HTML format
'value' => function($data) { return implode('
',array_keys(ArrayHelper::map(Yii::$app->authManager->getPermissionsByRole($data->name), 'description', 'description' )));}
],
----
In the Yii2 framework there is a BaseHtmlPurifier.php file
, it has a
public static function process($content, $config = null)
method in the method called -
$configInstance = \HTMLPurifier_Config::create($ config instanceof \Closure ?null : $config);
and physically this class I have nowhere.
How many rabbit legs does it take to make this work?)
Why doesn't it work out of the box? Perhaps he doesn’t understand what doctype to display, but why didn’t they make HTML5 by default?)

Answer 1

Did you do a composer install?

Answer 2

In the login file (@app/web/index.php) add before

require dirname(__DIR__) . '/vendor/yiisoft/yii2/Yii.php';