php sha1withrsa

        //得到时间戳
        list($msec, $sec) = explode(‘ ‘, microtime());
        $time =  (float)sprintf(‘%.0f‘, (floatval($msec) + floatval($sec)) * 1000);
        //代签名字符串
        $tok = array();
        //排序
        ksort($tok);
        $arr = http_build_query($tok);
        $arr = urldecode($arr);
        $arr = base64_encode($arr);
        $private_key = ‘-----BEGIN RSA PRIVATE KEY-----

-----END RSA PRIVATE KEY-----‘;
        openssl_sign($arr, $signature, $private_key, OPENSSL_ALGO_SHA1);
        $sign = base64_encode($signature);
        dump($sign);