yii显示图片

yii显示图片

public function actionYzm()
    {
        //getCaptcha1.jpg
        $imgFullPath = \Yii::getAlias('@webroot').'\img\yzm\getCaptcha1.jpg';
        $response = \Yii::$app->getResponse();
//        return $this->renderContent($imgFullPath);

        $response->headers->set('Content-Type', 'image/jpeg');
        $response->format = \Yii\web\Response::FORMAT_RAW;
        $response->stream = fopen($imgFullPath, 'r');
        return $response->send();
//        return $response->sendFile($imgFullPath);

    }