WeChat payment sub-account signature md5 and HMAC-SHA256

     //签名  md5和hash_hmac只需要一种加密就可以
     public static function getSign($payConfig, $key) {

        ksort($payConfig);
        $str = "";
        foreach ($payConfig as $k => $v) {
            $str =$str. $k . "=" . $v."&";
        }
        $str=$str."key=".$key;
      //  $str= strtoupper(md5($str));
        $sig = hash_hmac("sha256", $str, $key, true);
       return  strtoupper(bin2hex($sig)); //二进制转成16进制字符
    }
    

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