SimpleImage::thumbnail PHP Method

    function thumbnail($width, $height = null)
    {
        // Determine height
        $height = $height ?: $width;
        // Determine aspect ratios
        $current_aspect_ratio = $this->height / $this->width;
        $new_aspect_ratio = $height / $width;
        // Fit to height/width
        if ($new_aspect_ratio > $current_aspect_ratio) {
            $this->fit_to_height($height);
        } else {
            $this->fit_to_width($width);
        }
        $left = floor($this->width / 2 - $width / 2);
        $top = floor($this->height / 2 - $height / 2);
        // Return trimmed image
        return $this->crop($left, $top, $width + $left, $height + $top);
    }

         $imgx->load($src_img);
         #-- check orientation ------------
         if (!empty($exif['Orientation'])) {
             switch ($exif['Orientation']) {
                 case 3:
                     $imgx->rotate(180);
                     break;
                 case 6:
                     $imgx->rotate(90);
                     break;
                 case 8:
                     $imgx->rotate(-90);
                     break;
             }
         }
         $imgx->thumbnail(500, 300);
         $imgx->save($app['data_path'] . "/konfig/gmb_header_" . $id . ".jpg");
         $data['gmb_header'] = "gmb_header_" . $id . ".jpg";
     } catch (Exception $e) {
         $_SESSION['msg'] = "gambar header gagal di unggah/upload ....";
         $_SESSION['alt'] = "warning";
         header("location: " . $urlx->get_referer());
         exit;
     }
 }
 $appx->mq_encode('p_headline,p_slogan');
 $sql = "update " . $app['table']["konfig_bahasa"] . "\n\t\t\t\tset headline = '{$p_headline}', \n\t\t\t\t    id_bahasa = '{$p_bahasa}',\n\t\t\t\t    slogan = '{$p_slogan}',\n\t\t\t\t\tmeta_description = '{$p_metades}',\n\t\t\t\t\tmeta_keyword = '{$p_metakey}',\n\t\t\t\t\tgmb_header  = '{$data['gmb_header']}',\n\t\t\t\t\ttgl_modif = now()\n\t\t\t\twhere id = '{$p_id}'";
 // echo $sql;exit;
 $dbu->qry($sql);
 $_SESSION['msg'] = "Data Provinsi {$p_nama} Berhasil Di Update ....";
 $_SESSION['alt'] = "success";