Gdn_UploadImage::imageIco PHP Method

    public static function imageIco($gd, $targetPath)
    {
        $imagePath = tempnam(sys_get_temp_dir(), 'iconify');
        imagepng($gd, $imagePath);
        $icoLib = new PHP_ICO($imagePath, [[16, 16]]);
        $icoLib->save_ico($targetPath);
        unlink($imagePath);
    }