Image::save PHP Method

    public function save($file, $quality = 90)
    {
        $info = pathinfo($file);
        $extension = strtolower($info['extension']);
        if (is_resource($this->image)) {
            if ($extension == 'jpeg' || $extension == 'jpg') {
                imagejpeg($this->image, $file, $quality);
            } elseif ($extension == 'png') {
                imagepng($this->image, $file);
            } elseif ($extension == 'gif') {
                imagegif($this->image, $file);
            }
            imagedestroy($this->image);
        }
    }

 public function resize($filename, $width, $height)
 {
     if (!file_exists(DIR_IMAGE . $filename) || !is_file(DIR_IMAGE . $filename)) {
         return;
     }
     $info = pathinfo($filename);
     $extension = $info['extension'];
     $old_image = $filename;
     $new_image = 'cache/' . utf8_substr($filename, 0, utf8_strrpos($filename, '.')) . '-' . $width . 'x' . $height . '.' . $extension;
     if (!file_exists(DIR_IMAGE . $new_image) || filemtime(DIR_IMAGE . $old_image) > filemtime(DIR_IMAGE . $new_image)) {
         $path = '';
         $directories = explode('/', dirname(str_replace('../', '', $new_image)));
         foreach ($directories as $directory) {
             $path = $path . '/' . $directory;
             if (!file_exists(DIR_IMAGE . $path)) {
                 @mkdir(DIR_IMAGE . $path, 0777);
             }
         }
         $image = new Image(DIR_IMAGE . $old_image);
         $image->resize($width, $height);
         $image->save(DIR_IMAGE . $new_image);
     }
     if (isset($this->request->server['HTTPS']) && ($this->request->server['HTTPS'] == 'on' || $this->request->server['HTTPS'] == '1')) {
         return HTTPS_CATALOG . 'image/' . $new_image;
     } else {
         return HTTP_CATALOG . 'image/' . $new_image;
     }
 }