发放红包文档：https://pay.weixin.qq.com/wiki/doc/api/tools/miniprogram_hb.php?chapter=13_9&index=2

领取红包文档：https://pay.weixin.qq.com/wiki/doc/api/tools/miniprogram_hb.php?chapter=13_10&index=3

class Index
{
    public function index(Request $request=null)
    {

        //商户订单号（每个订单号必须唯一。取值范围：0~9，a~z，A~Z）
        //组成： mch_id+yyyymmdd+10位一天内不能重复的数字。
        $mch_billno = ''.rand(1000000000,9999999999);
        $mch_id = '';//商户号
        $wxappid = '';//小程序账号appid
        $send_name = '';//商户名称
        $re_openid = '';//用户openid
        $total_amount = 30;//付款金额，单位分
        $total_num = 1;//红包发放总人数
        $wishing = '望天宇八方清似玉';//红包祝福语
        $client_ip = '';//调用接口的服务器Ip地址,提前在小程序后台设置好
        $act_name = '红包';//活动名称
        $remark = '6666';//备注
        $notify_way = 'MINI_PROGRAM_JSAPI';//通知用户形式JSAPI
        $scene_id = 'PRODUCT_2';//发放红包使用场景，红包金额大于200时必传
        $key = '';//商户号支付钥匙

        $weixinpay = new WeixinPay($mch_billno, $mch_id, $wxappid, $send_name,$re_openid,$total_amount,$total_num,$wishing,$client_ip,$act_name,$remark,$notify_way,$scene_id,$key);
        $res=$weixinpay->sendhb();
        $result = [
            'timeStamp'=> time()."",
            'nonceStr'=>$this->createNoncestr(),
            'package'=>urlencode($res['package']),
            'appId'=>$wxappid,

        ];
        $result['paySign'] = $this->getSign($result);
        return json($result);
    }



    private function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        } return $str;
    }


    private function getSign($Obj) {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);

        $String = $this->formatBizQueryParaMap($Parameters, false);
        //签名步骤二：在 string 后加入 KEY
        $String = $String . "&key=" . '商户号支付钥匙';

        //签名步骤三：MD5 加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写--根据接口需要打开限制
        $result_ = $String;
        // $result_ = strtoupper($String);
        return $result_;
    }

    /**
     * 作用：格式化参数，签名过程需要使用
     * @param $paraMap
     * @param $urlencode
     * @return string
     */
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = "";
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}






class WeixinPay {

    private $sendurl = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/sendminiprogramhb';//发放红包接口
    private $mch_billno;//商户订单号
    private $mch_id;//商户号
    private $wxappid;//公众账号appid
    private $send_name;//商户名称
    private $re_openid;//用户openid
    private $total_amount;//付款金额，单位分
    private $total_num;//红包发放总人数
    private $wishing;//红包祝福语
    private $client_ip;//Ip地址
    private $act_name;//活动名称
    private $remark;//备注
    private $notify_way;//通知用户形式
    private $scene_id;//发放红包使用场景，红包金额大于200时必传
    private $key;//商户号支付钥匙

    function __construct($mch_billno, $mch_id, $wxappid, $send_name,$re_openid,$total_amount,$total_num,$wishing,$client_ip,$act_name,$remark,$notify_way,$scene_id,$key) {
        $this->mch_billno = $mch_billno;
        $this->mch_id = $mch_id;
        $this->wxappid = $wxappid;
        $this->send_name = $send_name;
        $this->re_openid = $re_openid;
        $this->total_amount = $total_amount;
        $this->total_num = $total_num;
        $this->wishing = $wishing;
        $this->client_ip = $client_ip;
        $this->act_name = $act_name;
        $this->remark = $remark;
        $this->notify_way = $notify_way;
        $this->scene_id = $scene_id;
        $this->key = $key;
    }

    public function sendhb(){
        //随机字符串
        $nonce_str = $this->createNoncestr();
        //商户订单号
        $mch_billno = $this->mch_billno;
        //商户号
        $mch_id = $this->mch_id;
        //公众账号appid
        $wxappid = $this->wxappid;
        //商户名称
        $send_name = $this->send_name;
        //用户openid
        $re_openid = $this->re_openid;
        //付款金额，单位分
        $total_amount = $this->total_amount;
        //红包发放总人数
        $total_num = $this->total_num;
        //红包祝福语
        $wishing = $this->wishing;
        //Ip地址
        $client_ip = $this->client_ip;
        //活动名称
        $act_name = $this->act_name;
        //备注
        $remark = $this->remark;
        //通知用户形式
        $notify_way = $this->notify_way;
        //发放红包使用场景，红包金额大于200时必传
        $scene_id = $this->scene_id;

        $parameters = array(
            'nonce_str' => $nonce_str,
            'mch_billno' => $mch_billno,
            'mch_id' => $mch_id,
            'wxappid' => $wxappid,
            'send_name' => $send_name,
            're_openid' => $re_openid,
            'total_amount' => $total_amount,
            'total_num' => $total_num,
            'wishing' => $wishing,
            'client_ip' => $client_ip,
            'act_name' => $act_name,
            'remark' => $remark,
            'notify_way' => $notify_way,
            'scene_id' => $scene_id
        );
        //生成签名，所有参数+key然后MD5
        $parameters['sign'] = $this->getSign($parameters);

        $xmlData = $this->arrayToXml($parameters);
//        var_dump($xmlData);
        $curlres = $this->postXmlCurl($xmlData, $this->sendurl);
//        var_dump($curlres);
        $res = $this->xmlToArray($curlres);

//        var_dump($res);
        return $res;
    }


    private function postXmlCurl($xml, $url)
    {

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 20);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        //证书的位置
//        var_dump(curl_setopt($ch, CURLOPT_SSLCERT, __DIR__ . '/cert/apiclient_cert.pem'));die;
        curl_setopt($ch, CURLOPT_SSLCERT,'D:/phpstudy_pro/WWW/weixinpem/apiclient_cert.pem');
        //证书key的位置
        curl_setopt($ch, CURLOPT_SSLKEY,'D:/phpstudy_pro/WWW/weixinpem/apiclient_key.pem');

        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new Exception("curl出错，错误码:$error");
        }
    }

    //数组转换成xml
    private function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . $this->arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    //xml转换成数组
    private function xmlToArray($xml) {
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }

    //作用：产生随机字符串，不长于32位
    private function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    //作用：生成签名
    private function getSign($Obj) {
        foreach ($Obj as $k => $v) {
            //不为空的参数才参与签名
            if(!empty($v)){
                $Parameters[$k] = $v;
            }
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($String);
        return $result;
    }

    //作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }

}