/**       * Create a thumbnail image from $inputFileName no taller or wider than       * $maxSize. Returns the new image resource or false on error.       * Author: mthorn.net       */      function thumbnail($inputFileName, $maxSize = 100)      {          $info = getimagesize($inputFileName);              $type = isset($info['type']) ? $info['type'] : $info[2];              // Check support of file type          if ( !(imagetypes() & $type) )          {              // Server does not support file type              return false;          }              $width  = isset($info['width'])  ? $info['width']  : $info[0];          $height = isset($info['height']) ? $info['height'] : $info[1];              // Calculate aspect ratio          $wRatio = $maxSize / $width;          $hRatio = $maxSize / $height;              // Using imagecreatefromstring will automatically detect the file type          $sourceImage = imagecreatefromstring(file_get_contents($inputFileName));              // Calculate a proportional width and height no larger than the max size.          if ( ($width <= $maxSize) && ($height <= $maxSize) )          {              // Input is smaller than thumbnail, do nothing              return $sourceImage;          }          elseif ( ($wRatio * $height) < $maxSize )          {              // Image is horizontal              $tHeight = ceil($wRatio * $height);              $tWidth  = $maxSize;          }          else          {              // Image is vertical              $tWidth  = ceil($hRatio * $width);              $tHeight = $maxSize;          }              $thumb = imagecreatetruecolor($tWidth, $tHeight);              if ( $sourceImage === false )          {              // Could not load image              return false;          }              // Copy resampled makes a smooth thumbnail          imagecopyresampled($thumb, $sourceImage, 0, 0, 0, 0, $tWidth, $tHeight, $width, $height);          imagedestroy($sourceImage);              return $thumb;      }          /**       * Save the image to a file. Type is determined from the extension.       * $quality is only used for jpegs.       * Author: mthorn.net       */      function imageToFile($im, $fileName, $quality = 80)      {          if ( !$im || file_exists($fileName) )          {             return false;          }              $ext = strtolower(substr($fileName, strrpos($fileName, '.')));              switch ( $ext )          {              case '.gif':                  imagegif($im, $fileName);                  break;              case '.jpg':              case '.jpeg':                  imagejpeg($im, $fileName, $quality);                  break;              case '.png':                  imagepng($im, $fileName);                  break;              case '.bmp':                  imagewbmp($im, $fileName);                  break;              default:                  return false;          }              return true;      }          $im = thumbnail('temp.jpg', 100);      imageToFile($im, 'temp-thumbnail.jpg');