What are the licensing concerns related to using the GD-Lib for thumbnail creation in PHP?

The main licensing concern related to using the GD-Lib for thumbnail creation in PHP is that GD-Lib is released under the PHP License, which is not compatible with the GNU General Public License (GPL). To solve this issue, you can use an alternative library like ImageMagick, which is released under a more permissive license.

// Example code using ImageMagick for thumbnail creation
$thumbnail = new Imagick('input.jpg');
$thumbnail->thumbnailImage(100, 100);
$thumbnail->writeImage('output.jpg');