在MySQL中从blob调整PHP中图像的大小

   $blob = mysql_fetch_...();

   $gd = imagecreatefromstring($blob);
   $resized = imagecreatetruecolor(X, Y); // new image dimensions
   imagecopyresampled(....);

   ob_start();
   imagejpeg($resized);
   $new_blob = ob_get_clean();

   mysql_query(... update table ...);