private function thumbnail($src, $dist, $dis_width = 100)
    {

        $img = '';
        $extension = strtolower(strrchr($src, '.'));
        switch ($extension) {
            case '.jpg':
            case '.jpeg':
                $img = @imagecreatefromjpeg($src);
                break;
            case '.gif':
                $img = @imagecreatefromgif($src);
                break;
            case '.png':
                $img = @imagecreatefrompng($src);
                break;
        }
        $width = imagesx($img);
        $height = imagesy($img);


        $dis_height = $dis_width * ($height / $width);

        $new_image = imagecreatetruecolor($dis_width, $dis_height);
        imagecopyresampled($new_image, $img, 0, 0, 0, 0, $dis_width, $dis_height, $width, $height);


        $imageQuality = 100;

        switch ($extension) {
            case '.jpg':
            case '.jpeg':
                if (imagetypes() & IMG_JPG) {
                    imagejpeg($new_image, $dist, $imageQuality);
                }
                break;

            case '.gif':
                if (imagetypes() & IMG_GIF) {
                    imagegif($new_image, $dist);
                }
                break;

            case '.png':
                $scaleQuality = round(($imageQuality / 100) * 9);
                $invertScaleQuality = 9 - $scaleQuality;

                if (imagetypes() & IMG_PNG) {
                    imagepng($new_image, $dist, $invertScaleQuality);
                }
                break;
        }
        imagedestroy($new_image);
    }