PHP implements WeChat payment cash red envelope

This article mainly introduces in detail the cash red envelope implementation of WeChat payment in PHP. It has a certain reference value. Interested friends can refer to the many PHP WeChat payment access tutorials on the Internet

They are quite complicated and require a lot of configuration and introduction of files. I have sorted them out and given a single file version. I hope it can bring some help and reference to everyone who wants to access WeChat payment.

Run this file directly to send cash red envelopes to the designated WeChat users.

Things to note:

1. WeChat Cash Red Packet requires a certificate. You need to go to Account Center->Account Settings->API Security-> to download the certificate and then modify it. Certificate path in the code

2. The default usage scenario is a lottery (that is, the scene_id parameter is PRODUCT_2), and the amount is 1-200 yuan, so the minimum amount during testing is 1 yuan. If you need to modify it, modify

3 in the Product Center->Product Directory->Cash Red Packet->Product Settings. This file needs to be placed in the payment authorization directory, which can be done on the WeChat Pay Merchant Platform ->Product Center->Set in development configuration.

4. If a signature error is prompted, you can verify it through the WeChat payment signature verification tool: WeChat public platform payment interface debugging tool

5. Error code reference: Address

The code is as follows:

<?php
/**
 * 关于微信现金红包的说明
 * 1.微信现金红包要求必传证书，需要到https://pay.weixin.qq.com 账户中心->账户设置->API安全->下载证书，证书路径在第214行和217行修改
 * 2.默认的使用场景是抽奖（即scene_id参数为PRODUCT_2），额度是1-200元，所以测试时的最低金额是1元。如需修改在产品中心->产品大全->现金红包->产品设置中修改
 * 3.错误码参照 ：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3
 */
header(&#39;Content-type:text/html; Charset=utf-8&#39;);
$mchid = &#39;xxxxx&#39;;  //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = &#39;xxxxx&#39;; //微信支付申请对应的公众号的APPID
$appKey = &#39;xxxxx&#39;; //微信支付申请对应的公众号的APP Key
$apiKey = &#39;xxxxx&#39;; //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥

//①、获取当前访问页面的用户openid（如果给指定用户发送红包，则填写指定用户的openid)
$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);
$openId = $wxPay->GetOpenid(); //获取openid
if(!$openId) exit(&#39;获取openid失败&#39;);
//②、发送红包
$outTradeNo = uniqid(); //你自己的商品订单号
$payAmount = 1;  //红包金额，单位:元
$sendName = &#39;织梦猫&#39;; //红包发送者名称
$wishing = &#39;感谢您参加猜灯谜活动，祝您元宵节快乐！&#39;; //红包祝福语
$act_name=&#39;猜灯谜抢红包活动&#39;;  //活动名称
$result = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$sendName,$wishing,$act_name);
echo &#39;success&#39;;

class WxpayService
{
 protected $mchid;
 protected $appid;
 protected $appKey;
 protected $apiKey;
 public $data = null;

 public function __construct($mchid, $appid, $appKey,$key)
 {
 $this->mchid = $mchid;
 $this->appid = $appid;
 $this->appKey = $appKey;
 $this->apiKey = $key;
 }

 /**
 * 通过跳转获取用户的openid，跳转流程如下：
 * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
 * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
 * @return 用户的openid
 */
 public function GetOpenid()
 {
 //通过code获得openid
 if (!isset($_GET[&#39;code&#39;])){
  //触发微信返回code码
  $scheme = $_SERVER[&#39;HTTPS&#39;]==&#39;on&#39; ? &#39;https://&#39; : &#39;http://&#39;;
  $baseUrl = urlencode($scheme.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].$_SERVER[&#39;QUERY_STRING&#39;]);
  $url = $this->__CreateOauthUrlForCode($baseUrl);
  Header("Location: $url");
  exit();
 } else {
  //获取code码，以获取openid
  $code = $_GET[&#39;code&#39;];
  $openid = $this->getOpenidFromMp($code);
  return $openid;
 }
 }

 /**
 * 通过code从工作平台获取openid机器access_token
 * @param string $code 微信跳转回来带上的code
 * @return openid
 */
 public function GetOpenidFromMp($code)
 {
 $url = $this->__CreateOauthUrlForOpenid($code);
 $res = self::curlGet($url);
 //取出openid
 $data = json_decode($res,true);
 $this->data = $data;
 $openid = $data[&#39;openid&#39;];
 return $openid;
 }

 /**
 * 构造获取open和access_toke的url地址
 * @param string $code，微信跳转带回的code
 * @return 请求的url
 */
 private function __CreateOauthUrlForOpenid($code)
 {
 $urlObj["appid"] = $this->appid;
 $urlObj["secret"] = $this->appKey;
 $urlObj["code"] = $code;
 $urlObj["grant_type"] = "authorization_code";
 $bizString = $this->ToUrlParams($urlObj);
 return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
 }

 /**
 * 构造获取code的url连接
 * @param string $redirectUrl 微信服务器回跳的url，需要url编码
 * @return 返回构造好的url
 */
 private function __CreateOauthUrlForCode($redirectUrl)
 {
 $urlObj["appid"] = $this->appid;
 $urlObj["redirect_uri"] = "$redirectUrl";
 $urlObj["response_type"] = "code";
 $urlObj["scope"] = "snsapi_base";
 $urlObj["state"] = "STATE"."#wechat_redirect";
 $bizString = $this->ToUrlParams($urlObj);
 return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
 }

 /**
 * 拼接签名字符串
 * @param array $urlObj
 * @return 返回已经拼接好的字符串
 */
 private function ToUrlParams($urlObj)
 {
 $buff = "";
 foreach ($urlObj as $k => $v)
 {
  if($k != "sign") $buff .= $k . "=" . $v . "&";
 }
 $buff = trim($buff, "&");
 return $buff;
 }

 /**
 * 发送红包
 * @param string $openid 用户在该公众号下的Openid
 * @param float $totalFee 红包金额 单位元
 * @param string $outTradeNo 订单号
 * @param string $orderName 红包发送者名称
 * @param string $wishing 祝福语
 * @param string $actName 互动名称
 * @return string
 */
 public function createJsBizPackage($openid, $totalFee, $outTradeNo, $sendName,$wishing,$actName)
 {
 $config = array(
  &#39;mch_id&#39; => $this->mchid,
  &#39;appid&#39; => $this->appid,
  &#39;key&#39; => $this->apiKey,
 );
 $unified = array(
  &#39;wxappid&#39; => $config[&#39;appid&#39;],
  &#39;send_name&#39; => $sendName,
  &#39;mch_id&#39; => $config[&#39;mch_id&#39;],
  &#39;nonce_str&#39; => self::createNonceStr(),
  &#39;re_openid&#39; => $openid,
  &#39;mch_billno&#39; => $outTradeNo,
  &#39;client_ip&#39; => &#39;127.0.0.1&#39;,
  &#39;total_amount&#39; => intval($totalFee * 100), //单位 转为分
  &#39;total_num&#39;=>1,   //红包发放总人数
  &#39;wishing&#39;=>$wishing,  //红包祝福语
  &#39;act_name&#39;=>$actName,  //活动名称
  &#39;remark&#39;=>&#39;remark&#39;,  //备注信息，如为中文注意转为UTF8编码
  &#39;scene_id&#39;=>&#39;PRODUCT_2&#39;, //发放红包使用场景，红包金额大于200时必传。https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3
 );
 $unified[&#39;sign&#39;] = self::getSign($unified, $config[&#39;key&#39;]);
 $responseXml = $this->curlPost(&#39;https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack&#39;, self::arrayToXml($unified));
 $unifiedOrder = simplexml_load_string($responseXml, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
 if ($unifiedOrder === false) {
  die(&#39;parse xml error&#39;);
 }
 if ($unifiedOrder->return_code != &#39;SUCCESS&#39;) {
  die($unifiedOrder->return_msg);
 }
 if ($unifiedOrder->result_code != &#39;SUCCESS&#39;) {
  die($unifiedOrder->err_code);
 }
 return true;
 }

 public static function curlGet($url = &#39;&#39;, $options = array())
 {
 $ch = curl_init($url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_TIMEOUT, 30);
 if (!empty($options)) {
  curl_setopt_array($ch, $options);
 }
 //https请求 不验证证书和host
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }

 public function curlPost($url = &#39;&#39;, $postData = &#39;&#39;, $options = array())
 {
 if (is_array($postData)) {
  $postData = http_build_query($postData);
 }
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
 curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
 if (!empty($options)) {
  curl_setopt_array($ch, $options);
 }
 //https请求 不验证证书和host
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

 //第一种方法，cert 与 key 分别属于两个.pem文件
 //默认格式为PEM，可以注释
 curl_setopt($ch,CURLOPT_SSLCERTTYPE,&#39;PEM&#39;);
 curl_setopt($ch,CURLOPT_SSLCERT,getcwd().&#39;/cert/apiclient_cert.pem&#39;);
 //默认格式为PEM，可以注释
 curl_setopt($ch,CURLOPT_SSLKEYTYPE,&#39;PEM&#39;);
 curl_setopt($ch,CURLOPT_SSLKEY,getcwd().&#39;/cert/apiclient_key.pem&#39;);
 //第二种方式，两个文件合成一个.pem文件
// curl_setopt($ch,CURLOPT_SSLCERT,getcwd().&#39;/all.pem&#39;);
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }

 public static function createNonceStr($length = 16)
 {
 $chars = &#39;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&#39;;
 $str = &#39;&#39;;
 for ($i = 0; $i < $length; $i++) {
  $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
 }
 return $str;
 }
 public static function arrayToXml($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;
 }

 public static function getSign($params, $key)
 {
 ksort($params, SORT_STRING);
 $unSignParaString = self::formatQueryParaMap($params, false);
 $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
 return $signStr;
 }
 protected static function formatQueryParaMap($paraMap, $urlEncode = false)
 {
 $buff = "";
 ksort($paraMap);
 foreach ($paraMap as $k => $v) {
  if (null != $v && "null" != $v) {
  if ($urlEncode) {
   $v = urlencode($v);
  }
  $buff .= $k . "=" . $v . "&";
  }
 }
 $reqPar = &#39;&#39;;
 if (strlen($buff) > 0) {
  $reqPar = substr($buff, 0, strlen($buff) - 1);
 }
 return $reqPar;
 }
}
?>

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