/**
* 生成签名结果
*
* @param $para_sort 已排序要签名的数组
*
* @return 签名结果字符串
*/
function buildRequestMysign($para_sort)
{
//把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
$prestr = Core::createLinkstring($para_sort);
$mysign = "";
switch (strtoupper(trim($this->alipay_config['sign_type']))) {
case "RSA":
$mysign = Rsa::rsaSign($prestr, $this->alipay_config['private_key_path']);
break;
default:
$mysign = "";
}
return $mysign;
}