code: public function save($content = null, $time = 30)
      {
          $fileName = md5($this->prefix . http()->server('REQUEST_URI')) . $this->extension;
          $this->file = cache_path('html' . DIRECTORY_SEPARATOR . $fileName);
  
          $this->start($time);
          return $this->finish($content);
      }
docs: Save cache file
  
  @param string $content
  @param int    $time
  
  @return string|bool