Comments for Resizing an Image Using PHP and the GD2 Library

function imageResize($source, $dest, $maxWidth, $maxHeight)
{
  $is = getimagesize($source);
  $fw = ($is[0] >= $is[1]) ? $maxWidth : $maxHeight;
  $fh = ($is[0] >= $is[1]) ? $maxHeight : $maxWidth;
  $orientation = ($is[0] >= $is[1]) ? 0 : 1;

  $iw = $is[0];
  $ih = $is[1];
  $t = 2;

  if ($is[0] > $fw || $is[1] > $fh)
  {
    if ($is[0] - $fw >= $is[1] - $fh)
    {
      $iw = $fw;
      $ih = ($fw / $is[0]) * $is[1];
    }
    else
    {
      $ih = $fh;
      $iw = ($ih / $is[1]) * $is[0];
    }
    
    $t = 1;
  }

  switch ($t)
  {
    case 1:
      $src = imagecreatefromjpeg($source);
      $dst = imagecreatetruecolor( $iw, $ih );
      imagecopyresampled($dst, $src, 0, 0, 0, 0, $iw, $ih, $is[0], $is[1]);
      return imagejpeg($dst, $dest, 90);
      break;
    case 2:
      return copy($source, $dest);
      break;
    default:
      return false;
      break;
  }
}