rmrevin\yii\fontawesome\FontAwesome::i PHP Method

    public static function i($name, $options = [])
    {
        return static::icon($name, $options);
    }

use backend\helpers\ArrayHelper;
use dosamigos\chartjs\ChartJs;
use rmrevin\yii\fontawesome\FontAwesome;
use yii\bootstrap\Html;
$this->title = "Просмотр опроса '{$quiz->name}'";
$this->params['breadcrumbs'][] = ['url' => '/quiz', 'label' => 'Опросы'];
$this->params['breadcrumbs'][] = 'Просмотр опроса';
$colors = \Colors\RandomColor::many(sizeof($quiz->answersWithCount), ['hue' => 'blue', 'luminosity' => 'light']);
?>
<div class="panel panel-default">
    <div class="panel-heading">
        <?php 
echo Html::a(FontAwesome::i('arrow-left') . Html::tag('small', 'Назад'), ['/quiz/default/index'], ['class' => 'btn btn-app']);
?>
        <?php 
echo Html::a(FontAwesome::i('pencil') . Html::tag('small', 'Редактировать'), ['/quiz/edit/' . $quiz->id], ['class' => 'btn btn-app']);
?>
    </div>
    <div class="panel-body">
        <div class="col-xs-6">
            <?php 
echo ChartJs::widget(['type' => 'pie', 'data' => ['datasets' => [['data' => ArrayHelper::toPercents(array_values(ArrayHelper::getColumn($quiz->answersWithCount, 'count'))), 'label' => 'Результаты опроса', 'backgroundColor' => $colors]], 'labels' => array_values(ArrayHelper::getColumn($quiz->answersWithCount, 'text'))]]);
?>
        </div>
        <div class="col-xs-6">
            <?php 
echo ChartJs::widget(['type' => 'bar', 'data' => ['datasets' => [['data' => array_values(ArrayHelper::getColumn($quiz->answersWithCount, 'count')), 'label' => 'Результаты опроса', 'backgroundColor' => $colors]], 'labels' => array_values(ArrayHelper::getColumn($quiz->answersWithCount, 'text'))], 'options' => []]);
?>
        </div>
        <div class="col-xs-12">
            <hr>