A class for creating image thumbnail

thumbnail.class.php

class thumbnail {

  public $path;
  public $save;
  public $width;
  public $height;

  public function __construct($path, $save, $width, $height) {
    $this->path = $path; // path to original image to create thumbnail from
    $this->save = $save; // path and file name for saving a thumbnail
    $this->width = $width; // desired width of the thumbnail
    $this->height = $height; // desired height of the thumbnail
  }   

  public function create_thumbnail() {
    $info = getimagesize($path);
    $size = array($info[0], $info[1]);

    if($info['mime'] == "image/png") 
    {
      $src = imagecreatefrompng($path);
    }
    else if ($info['mime'] == "image/jpeg")
    {
      $src = imagecreatefromjpeg($path);
    }
    else if ($info['mime'] == "image/gif")
    {
      $src = imagecreatefromgif($path);
    }
    else
    {
      return false;
    }

    $thumb = imagecreatetruecolor($width, $height);

    $src_aspect = $size[0] / $size[1];
    $thumb_aspect = $width / $height;

    if($src_aspect < $thumb_aspect)
    {
      $scale = $width / $size[0];
      $new_size = array($width, $width / $src_aspect);
      $src_pos = array(0, ($size[1] * $scale - $height) / $scale / 2);
    }
    else if($src_aspect > $thumb_aspect)
    {
      $scale = $height / $size[1];
      $new_size = array($height * $src_aspect, $height);
      $src_pos = array(($size[0] * $scale - $width) / $scale / 2, 0);
    }
    else
    {
      $new_size = array($width, $height);
      $src_pos = array(0, 0);
    }

    $new_size[0] = max($new_size[0], 1);
    $new_size[1] = max($new_size[1], 1);
    imagecopyresampled($thumb, $src, 0, 0, $src_pos[0], $src_pos[1], $new_size[0], $new_size[1], $size[0], $size[1]);

    if($save === false)
    {
      if($info['mime'] == "image/png") 
      {
        return imagepng($thumb);
      }
      else if ($info['mime'] == "image/jpeg")
      {
        return imagejpeg($thumb);
      }
      else if ($info['mime'] == "image/gif")
      {
        return imagegif($thumb);
      }
    }
    else
    {
      if($info['mime'] == "image/png") 
      {
        return imagepng($thumb, $save);
      }
      else if ($info['mime'] == "image/jpeg")
      {
        return imagejpeg($thumb, $save);
      }
      else if ($info['mime'] == "image/gif")
      {
        return imagegif($thumb, $save);
      }   
    }
  }

}