public function __construct() { $this->date0 = isset(Yii::$app->request->queryParams['BooksSearch']['date0']) ? Yii::$app->request->queryParams['BooksSearch']['date0'] : ''; $this->date1 = isset(Yii::$app->request->queryParams['BooksSearch']['date1']) ? Yii::$app->request->queryParams['BooksSearch']['date1'] : ''; parent::__construct(); }