How to change line type when uploading files?

Question

Yii

Hello. I want to load the table that I exported. Writes that the type of the id_avtor1 string must be integer (Array ( [id_avtor1] => Array ( [0] => Id Avtor1 must be an integer). Changed from int to integer in models. But, it turns out, you need to change it in the controller when How to change the type of the id_avtor1 field to integer here?

public function actionUpload()
    {

        $model = new UploadForm();
        if (Yii::$app->request->isPost ) {
            $model->fName = UploadedFile::getInstance($model, 'fName');
            if ($fName =$model->upload()) {
                    //путь к файлу

                    if (($handle = fopen($fName, 'r')) !== false) {


                        while (($row = fgetcsv($handle, 1000, ',')) !== false) {
                            $model = new Kniga1();
                            $model->name = $row [0];
                            $model->creation_date = $row [1];
                            $model->id_avtor1 = $row [2];

                            if ($model->validate()) {
                                $model->save();
                            } else {
                                $model->save();
                                print_r($model->errors);
                            }
                        }
                        fclose($handle);
                    };
                    //... код после импорта
            }

        }
        return $this->render('upload', ['model' => $model]);
    }

I tried the option but it's not that) $model->id_avtor1='integer';