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  public function getPostParam($str)
  {
    if ('' != $str && isset($_POST[$str]))
    {
      return trim($_POST[$str]);
    }
    return '';
  }
  
  public function getGetParam($str)
  {
    if ('' != $str && isset($_GET[$str]))
    {
      return trim($_GET[$str]);
    }
    return '';
  }
  
    public function getParam($str)
    {
      if ('' === $re = $this->getGetParam($str))
      {
        $re = $this->getPostParam($str);
      }
      return $re;
    }