[Intervention Image] Apply multiple watermark to image

apply-watermark.php

<?php

// .....

$img = Image::make('images/picture.jpg');
$watermark = Image::make('images/watermark.png');

$x = 0;

while ($x < $img->width()) {
      $y = 0;

      while($y < $img->height()) {
            $img->insert('images/watermark.png', 'top-left', $x, $y);
            $y += $watermark->height();
      }

      $x += $watermark->width();
}

$img->save(public_path('storage/' . $thumbnailFile), 60);