Fixed current page display

DropdownPager.php

<?php
/**
 * @author      Serge Postrash aka SDKiller <jexy.ru@gmail.com>
 */

namespace frontend\widgets;

use Yii;
use yii\helpers\Html;
use yii\widgets\LinkPager;
use yii\bootstrap\Dropdown;


class DropdownPager extends LinkPager
{
    /**
     * @inheritdoc
     */
    public function run()
    {
        if ($this->registerLinkTags) {
            $this->registerLinkTags();
        }

        $linkOptions['data-toggle'] = 'dropdown';
        $linkOptions['role']        = 'button';
        Html::addCssClass($linkOptions, 'dropdown-toggle');

        $html = Html::a(Yii::t('app', 'Page') . ' ' . ($this->pagination->getPage() + 1) . ' <span class="caret"></span>', '#', $linkOptions);
        $html .= Dropdown::widget([
            'items'        => $this->configureItems(),
            'encodeLabels' => false,
        ]);

        echo $html;
    }

    /**
     * Renders the page buttons.
     * @return string the rendering result
     */
    protected function configureItems()
    {
        $items = [];

        $pageCount = $this->pagination->getPageCount();
        if ($pageCount < 2 && $this->hideOnSinglePage) {
            return $items;
        }

        $currentPage = $this->pagination->getPage();

        // first page
        if ($this->firstPageLabel !== false) {
            $items[] = $this->createPageItem($this->firstPageLabel, 0, $this->firstPageCssClass, $currentPage <= 0, false);
        }

        // prev page
        if ($this->prevPageLabel !== false) {
            if (($page = $currentPage - 1) < 0) {
                $page = 0;
            }
            $items[] = $this->createPageItem($this->prevPageLabel, $page, $this->prevPageCssClass, $currentPage <= 0, false);
        }

        // internal pages
        list($beginPage, $endPage) = $this->getPageRange();
        for ($i = $beginPage; $i <= $endPage; ++$i) {
            $items[] = $this->createPageItem($i + 1, $i, null, $i == $currentPage, $i == $currentPage);
        }

        // next page
        if ($this->nextPageLabel !== false) {
            if (($page = $currentPage + 1) >= $pageCount - 1) {
                $page = $pageCount - 1;
            }
            $items[] = $this->createPageItem($this->nextPageLabel, $page, $this->nextPageCssClass, $currentPage >= $pageCount - 1, false);
        }

        // last page
        if ($this->lastPageLabel !== false) {
            $items[] = $this->createPageItem($this->lastPageLabel, $pageCount - 1, $this->lastPageCssClass, $currentPage >= $pageCount - 1, false);
        }

        return $items;
    }

    /**
     * Creates a configuration array for Dropdown item.
     * Refer to description for \yii\bootstrap\Dropdown::$items property.
     * @param string $label the text label for the button
     * @param integer $page the page number
     * @param string $class the CSS class for the page button.
     * @param boolean $disabled whether this page button is disabled
     * @param boolean $active whether this page button is active
     * @return array
     */
    protected function createPageItem($label, $page, $class, $disabled, $active)
    {
        $item = ['label' => $label];
        $options = ['class' => $class === '' ? null : $class];
        if ($active) {
            Html::addCssClass($options, $this->activePageCssClass);
        }
        if ($disabled) {
            Html::addCssClass($options, $this->disabledPageCssClass);
            $item['options'] = $options;
            return $item;
        }
        $linkOptions = $this->linkOptions;
        $linkOptions['data-page'] = $page;

        $item['options']     = $options;
        $item['linkOptions'] = $linkOptions;
        $item['url']         = $this->pagination->createUrl($page);

        return $item;
    }

}