Add Banner return unknown characters

[tommyhartono]

Hello, I tried to use add banner feature in my image (my purpose is to add logo stamp to my image)

Main Image I use https://app.mulai.com/pub/2021/7/20/3d3d514f2021-07-20-14-36-44x.png
The banner image is https://app.mulai.com/images/splash/favicon-16x16.png

I use this code

$image = new ImageResize('pub/2021/7/20/3d3d514f2021-07-20-14-36-44x.png');

// Add banner on bottom left corner
$image18Plus = 'images/splash/favicon-16x16.png';
$image->addFilter(function ($imageDesc) use ($image18Plus) {
    $logo = imagecreatefrompng($image18Plus);
    $logo_width = imagesx($logo);
    $logo_height = imagesy($logo);
    $image_width = imagesx($imageDesc);
    $image_height = imagesy($imageDesc);
    $image_x = $image_width - $logo_width - 10;
    $image_y = $image_height - $logo_height - 10;
    imagecopy($imageDesc, $logo, $image_x, $image_y, 0, 0, $logo_width, $logo_height);
});

to output I put something like this

But it shown an unknown list of character, you can check it at https://app.mulai.com/test.html

Am I doing anything wrong there?