Yii2 - disable html encode

In gridview add 'format' => 'raw'

    
    GridView::widget([
        'dataProvider' => $dataProvider,
        'columns' => [
            'id',
            [
                'attribute' => 'book',
                'label' => 'Books',
                'format' => 'raw', //this line disables html encoding
                'value' => function ($data) {
                    return Html::img('@web/books/book_id.jpg', [
                        'alt' => 'Harry Potter', 'class' => 'my_class'
                    ]);
                }
            ],
            'user_id',
        ],
    ]);
    

In form field add ['encode' => false]

    
    $form->field($model, 'bookList')->radioList([
        1 => Html::img('@web/books/book_1.jpg'),
        2 => Html::img('@web/books/book_2.jpg')
    ], ['encode' => false])->label();