private function buildRequestPara($para_temp)
{
//除去待签名参数数组中的空值和签名参数
$para_filter = $this->paraFilter($para_temp);
//对待签名参数数组排序
$para_sort = $this->argSort($para_filter);
//生成签名结果
$mysign = $this->buildRequestMysign($para_sort);
//签名结果与签名方式加入请求提交参数组中
$para_sort['sign'] = $mysign;
$para_sort['sign_type'] = strtoupper(trim($this->sign_type));
return $para_sort;
}