artweb/artbox-core/widgets/views/_feedback.php

<?php
    /**
     * @var View $this
     * @var int  $count
     */
    use yii\web\View;
    use yii\helpers\Url;
?>
<a href="<?php echo Url::to([ '/feedback' ]); ?>" class="info-number feedback-widget" aria-expanded="false">
    <i class="fa fa-envelope-o"></i>
    <?php if (!empty( $count )) { ?>
        <span class="badge bg-green"><?= $count ?></span>
    <?php } ?>
</a>