<"sign"] = $this->generateSign($commonConfigs, $commonConfigs['sign_type']);
    return $this->buildRequestForm($commonConfigs);
  }

  /**
   * 建立请求，以表单HTML形式构造（默认）
   * @param $para_temp 请求参数数组
   * @return 提交表单HTML文本
   */
  protected function buildRequestForm($para_temp) {

    $sHtml = "<form id='alipaysubmit' name='alipaysubmit' action='https://openapi.alipay.com/gateway.do".$this->charset."' method='POST'>";
    while (list ($key, $val) = each ($para_temp)) {
      if (false === $this->checkEmpty($val)) {
        $val = str_replace("'","&apos;",$val);
        $sHtml.= "<input type='hidden' name='".$key."' value='".$val."'/>";
      }
    }
    //submit按钮控件请不要含有name属性
    $sHtml = $sHtml."<input type='submit' value='ok' style='display:none;''></form>";
    $sHtml = $sHtml."<script>document.forms['alipaysubmit'].submit();</script>";
    return $sHtml;
  }

  public function generateSign($params, $signType = "RSA") {
    return $this->sign($this->getSignContent($params), $signType);
  }

  protected function sign($data, $signType = "RSA") {
    $priKey=$this->rsaPrivateKey;
    $res = "-----BEGIN RSA PRIVATE KEY-----\n" .
      wordwrap($priKey, 64, "\n", true) .
      "\n-----END RSA PRIVATE KEY-----";

    ($res) or die('您使用的私钥格式错误，请检查RSA私钥配置');
    if ("RSA2" == $signType) {
      openssl_sign($data, $sign, $res, version_compare(PHP_VERSION,'5.4.0', '<') "")
      return true;

    return false;
  }

  public function getSignContent($params) {
    ksort($params);
    $stringToBeSigned = "";
    $i = 0;
    foreach ($params as $k => $v) {
      if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {
        // 转换成目标字符集
        $v = $this->characet($v, $this->charset);
        if ($i == 0) {
          $stringToBeSigned .= "$k" . "=" . "$v";
        } else {
          $stringToBeSigned .= "&" . "$k" . "=" . "$v";
        }
        $i++;
      }
    }

    unset ($k, $v);
    return $stringToBeSigned;
  }

  /**
   * 转换字符集编码
   * @param $data
   * @param $targetCharset
   * @return string
   */
  function characet($data, $targetCharset) {
    if (!empty($data)) {
      $fileType = $this->charset;
      if (strcasecmp($fileType, $targetCharset) != 0) {
        $data = mb_convert_encoding($data, $targetCharset, $fileType);
        //$data = iconv($fileType, $targetCharset.'//IGNORE', $data);
      }
    }
    return $data;
  }
}