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Filename : StatisticsController.php
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<?php

namespace app\controllers;

use Yii;
use yii\filters\AccessControl;
use yii\web\Controller;
use yii\web\Response;
use yii\web\Cookie;
use yii\filters\VerbFilter;
use app\models\Statistics;
use yii\data\SqlDataProvider;

class StatisticsController extends Controller
{
    /**
     * {@inheritdoc}
     */
    public function actions()
    {
      return [
        'error' => [
          'class' => 'yii\web\ErrorAction',
        ],
        'captcha' => [
          'class' => 'yii\captcha\CaptchaAction',
          'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
        ],
      ];
    }

    /**
     * Displays homepage.
     *
     * @return string
     */
    public function actionIndex()
    {
      $model = new Statistics();
      $dataProvider = $model->getItems();

      return $this->render("index", [
        'dataProvider' => $dataProvider
      ]);

    }

    /**
     * Displays a single Statistics model
     * @param integer $id
     * @return mixed
     */
    public function actionView($id)
    {
      return $this->render('view', [
        'dataProvider' => $this->findModel($id),
      ]);
    }

    public function actionLang($local)
    {

      \Yii::$app->language = $local;
        //var_dump($local);

      $languageCookie = new Cookie([
        'name' => 'language',
        'value' => $local,
            'expire' => time() + 60 * 60 * 24 * 30, // 30 days
          ]);

      Yii::$app->response->cookies->add($languageCookie);

      return $this->goBack();
    }

    protected function findModel($id)
    {
      if (($model = Statistics::findOne($id)) !== null) {
        return $model;
      } else {
        throw new NotFoundHttpException('The requested page does not exist.');
      }
    }

  }