<?php
namespace common\helpers;
use Yii;
class ActiveLink
{
    /**
     * Проверка на controller
     *
     * @param $name
     * @param $class
     * @return string
     */
    public static function controller($name, $class) {
        if ( Yii::$app->controller->id === $name ) {
            return $class;
        }
        return '';
    }
    /**
     * Проверка на controller/action
     *
     * @param $name
     * @param $class
     * @return string
     */
    public static function route($name, $class) {
        if ( Yii::$app->controller->route === $name ) {
            return $class;
        }
        return '';
    }
}<div class="sidebar__nav-list">
    <a href="<?= URL::toRoute('info/info') ?>" class="sidebar__nav-item <?= ActiveLink::controller('info', 'sidebar__nav-item_active') ?>">
        <img src="/admin/images/sidebar/info.png" class="sidebar__icon-item">
    </a>
    <a href="<?= URL::toRoute('news/news') ?>" class="sidebar__nav-item <?= ActiveLink::controller('news', 'sidebar__nav-item_active') ?>">
        <img src="/admin/images/sidebar/news.png" class="sidebar__icon-item">
    </a>
</div>