How to keep aspect ratio of Image and Watermark in Laravel php

Solution:

I think this should work for you:

public static function addwatermark ($name) {
{
    $thumbnail = Image::make($name);
    $imageWidth = $thumbnail->width();
    $watermarkSource =  Image::make(public_path('img/watermark/watermark.png'));

    $watermarkSize = round(20 * $imageWidth / 50);
    $watermarkSource->resize($watermarkSize, null, function ($constraint) {
        $constraint->aspectRatio();
    });

    $thumbnail->insert($watermarkSource, 'bottom-left', 0, 0);
    $thumbnail->save($name)->destroy();
}
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Solution:

If I understand what you mean : aspect ratio of watermark is 8:1 ( width of watermark is 8 times larger of its height ) and based on aspect ratio 2:50 or 1:25, width of the image is 25 times larger than width of watermark. for example: if image has 1000px width, the watermark width, should be 40px. so we also pass the width of image toaddwatermark function in helper.php.

use Image;

public static function addwatermark ($name, $imageWidth) {
  $watermarkWidth = $imageWidth / 25;
  $watermarkHeight = $watermarkWidth / 8;
  $watermarkSource = 'public/img/watermark/watermark.png';
  $watermark= Image::make($name)->resize($watermarkWidth, $watermarkHeight)->insert($watermarkSource, 'bottom-left', 0, 0);
  $watermark->save($name)->destroy();
}

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if I get it wrong, please let me know, thank you.