php - yii2 generates QR code and displays garbled characters

Question

use dosamigos\qrcode\QrCode;

public function actionQrcode()
{
    return QrCode::png('hello');
}

According to the original example, the picture cannot be displayed

Answer 1

use dosamigos\qrcode\QrCode;

public function actionQrcode() 
{
    header('Content-Type: image/png');
    ob_clean();
    return QrCode::png('hello');
}

Find the problem and add this to solve it

Thank you everyone for the solutions

Answer 2

I haven’t used it, but you can check what the response header content-Type is and whether it is image/png

Answer 3

Use incorrectly!
The parameter should be a url link---note that the link should be urldecoded
$url = urldecode($url);
QRcode::png($url);

Answer 4

use dosamigos\qrcode\QrCode;
use yii\web\Response;

public function actionQrcode() 
{ 
    \Yii::$app->response->format = Response::FORMAT_RAW;
    return QrCode::png('hello');
}