微信开发-现金红包-代码已运行通过

最近做的项目有公众号给用户发送红包的功能，在网上找的代码常常因为某些错误，跑不起来，故整理如下。

先看现金红包文档：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_1

话不多说，直接上代码

1.根据文档封装的验证信息

将$private_key替换为apikey商户支付平台上设置的密钥

<?php  
class wxPay  
{  
    private $private_key = 'xxx ';//32位的密钥，在商户平台上设置的  
  
    //核心支付函数,参数：请求地址和参数  
    function pay($url, $obj)  
    {  
        $obj['nonce_str'] = $this->create_noncestr();    //创建随机字符串  
        $stringA = $this->create_qianming($obj, false);    //创建签名  
        $stringSignTemp = $stringA . "&key=" . $this->private_key;    //签名后加api  
        $sign = strtoupper(md5($stringSignTemp));    //签名加密并大写  
        $obj['sign'] = $sign;    //将签名传入数组  
        $postXml = $this->arrayToXml($obj);    //将参数转为xml格式  
        $responseXml = $this->curl_post_ssl($url, $postXml);    //提交请求  
        return $responseXml;  
    }  
  
    //生成签名,参数：生成签名的参数和是否编码  
    function create_qianming($arr, $urlencode)  
    {  
        $buff = "";  
        ksort($arr); //对传进来的数组参数里面的内容按照字母顺序排序，a在前面，z在最后（字典序）  
        foreach ($arr as $k => $v) {  
            if (null != $v && "null" != $v && "sign" != $k) {    //签名不要转码  
                if ($urlencode) {  
                    $v = urlencode($v);  
                }  
                $buff .= $k . "=" . $v . "&";  
            }  
        }  
        if (strlen($buff) > 0) {  
            $reqPar = substr($buff, 0, strlen($buff) - 1); //去掉末尾符号“&”  
        }  
        return $reqPar;  
    }  
  
    //生成随机字符串，默认32位  
    function create_noncestr($length = 32)  
    {  
        //创建随机字符  
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";  
        $str = "";  
        for ($i = 0; $i < $length; $i++) {  
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);  
        }  
        return $str;  
    }  
  
    //数组转xml  
    function arrayToXml($arr)  
    {  
        $xml = "<xml>";  
        foreach ($arr as $key => $val) {  
            if (is_numeric($val)) {  
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";  
            } else {  
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";  
            }  
        }  
        $xml .= "</xml>";  
        return $xml;  
    }  
  
    //post请求网站，需要证书  
    function curl_post_ssl($url, $vars, $second = 30, $aHeader = array())  
    {  
        $ch = curl_init();  
        //超时时间  
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);  
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  
        //这里设置代理，如果有的话  
        curl_setopt($ch, CURLOPT_URL, $url);  
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);  
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);  
        //cert 与 key 分别属于两个.pem文件  
        //请确保您的libcurl版本是否支持双向认证，版本高于7.20.1  
        curl_setopt($ch, CURLOPT_SSLCERT, dirname(__FILE__) . DIRECTORY_SEPARATOR .  
            'zhengshu' . DIRECTORY_SEPARATOR . 'apiclient_cert.pem');  
        curl_setopt($ch, CURLOPT_SSLKEY, dirname(__FILE__) . DIRECTORY_SEPARATOR .  
            'zhengshu' . DIRECTORY_SEPARATOR . 'apiclient_key.pem');  
        curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . DIRECTORY_SEPARATOR .  
            'zhengshu' . DIRECTORY_SEPARATOR . 'rootca.pem');  
        if (count($aHeader) >= 1) {  
            curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);  
        }  
        curl_setopt($ch, CURLOPT_POST, 1);  
        curl_setopt($ch, CURLOPT_POSTFIELDS, $vars);  
        $data = curl_exec($ch);  
        if ($data) {  
            curl_close($ch);  
            return $data;  
        } else {  
            $error = curl_errno($ch);  
            echo "call faild, errorCode:$error\n";  
            curl_close($ch);  
            return false;  
        }  
    }  
  
}

2.发红包接口

将下面的几个红包参数（openid、money_sum、sender、mch_id、wxappid）更改为对应公众号的

<?php  
//设置接收红包者，和红包金额  
$openid = 'ojN41uHLEXYuHkrJg2_PaDvFBxxx';//接收红包openid  
$money_sum = 100;//以分为单位  
$sender = "xx教育";  
$mch_id = "129933xxxx";//appid  
$wxappid = "wxe6c6ab2ef372xxxx";//商户id  
  
//设置调接口的参数  
$pay_params = array();  
$pay_params['wxappid'] = $wxappid; //appid  
$pay_params['mch_id'] = $mch_id;//商户id  
$pay_params['mch_billno'] = $pay_params['mch_id'] . date('YmdHis') . rand(1000, 9999);//组合成28位，根据官方开发文档，可以自行设置  
$pay_params['client_ip'] = $_SERVER['REMOTE_ADDR'];  
$pay_params['re_openid'] = $openid;//接收红包openid  
$pay_params['total_amount'] = $money_sum;  
$pay_params['min_value'] = $money_sum;  
$pay_params['max_value'] = $money_sum;  
$pay_params['total_num'] = 1;//发放给的人数  
$pay_params['nick_name'] = $sender;  
$pay_params['send_name'] = $sender;  
$pay_params['wishing'] = "恭喜发财";  
$pay_params['act_name'] = $sender . "课程推荐";  
$pay_params['remark'] = $sender . "红包";  
  
$url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";  
require_once "weixin_red_packet_api.php";  
$wxpay = new \wxPay();  
$pay_result = $wxpay->pay($url, $pay_params);  
$responseObj = simplexml_load_string($pay_result, 'SimpleXMLElement', LIBXML_NOCDATA);  
  
//判断发送成功需下面两个值都为SUCCESS  
if ($pay_result && $responseObj->return_code == 'SUCCESS' && $responseObj->result_code == 'SUCCESS') {  
    return true;  
}  
return false;

3.其他补充

微信红包的钱是从商户平台的余额（初始为0元）里发出的，它跟微信支付的收款账号是无关，余额需要登录商户支付平台充值。还有，需要登录商户支付平台，将服务器的ip添加进微信红包的允许ip里。

注意：要登录商户支付平台才能拿到32位的apikey(密钥)、下载证书

完整代码下载

微信开发-现金红包-代码已运行通过

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