First of all, let me take a look at this form:

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Based on the WeChat advanced red envelope interface, the PHP version of the API interface is developed, and now the main code analysis is carried out.

The red envelope interface calls the request code. All request parameters are required and correspond to the document:

class Wxapi {
 private $app_id = 'wxXXXXXXXXXXXX'; //公眾賬號appid，首先申請與之配套的公眾賬號
 private $app_secret = 'XXXXXXXXXXXXXXXXXXXXXXXX';//公眾號secret，用戶獲取用戶授權(quán)token
 private $app_mchid = 'XXXXXXXX';//商戶號id
 function __construct(){
 //do sth here....
 }
 /**
  * 微信支付
  * @param string $openid 用戶openid
  */
 public function pay($re_openid)
 {
  include_once('WxHongBaoHelper.php');
  $commonUtil = new CommonUtil();
  $wxHongBaoHelper = new WxHongBaoHelper();
  $wxHongBaoHelper->setParameter("nonce_str", $this->great_rand());//隨機字符串，丌長于 32 位
  $wxHongBaoHelper->setParameter("mch_billno", $this->app_mchid.date('YmdHis').rand(1000, 9999));//訂單號
  $wxHongBaoHelper->setParameter("mch_id", $this->app_mchid);//商戶號
  $wxHongBaoHelper->setParameter("wxappid", $this->app_id);
  $wxHongBaoHelper->setParameter("nick_name", '紅包');//提供方名稱
  $wxHongBaoHelper->setParameter("send_name", '紅包');//紅包發(fā)送者名稱
  $wxHongBaoHelper->setParameter("re_openid", $re_openid);//相對于醫(yī)脈互通的openid
  $wxHongBaoHelper->setParameter("total_amount", 100);//付款金額，單位分
  $wxHongBaoHelper->setParameter("min_value", 100);//最小紅包金額，單位分
  $wxHongBaoHelper->setParameter("max_value", 100);//最大紅包金額，單位分
  $wxHongBaoHelper->setParameter("total_num", 1);//紅包収放總?cè)藬?shù)
  $wxHongBaoHelper->setParameter("wishing", '感謝您參與紅包派發(fā)活動，祝您新年快樂！');//紅包祝福詫
  $wxHongBaoHelper->setParameter("client_ip", '127.0.0.1');//調(diào)用接口的機器 Ip 地址
  $wxHongBaoHelper->setParameter("act_name", '紅包活動');//活勱名稱
  $wxHongBaoHelper->setParameter("remark", '快來搶！');//備注信息
  $postXml = $wxHongBaoHelper->create_hongbao_xml();
  $url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack';
  $responseXml = $wxHongBaoHelper->curl_post_ssl($url, $postXml);
  //用作結(jié)果調(diào)試輸出
  //echo htmlentities($responseXml,ENT_COMPAT,'UTF-8');
 $responseObj = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
 return $responseObj->return_code;
 }

Method to obtain a random string:

/**
 * 生成隨機數(shù)
 */  
public function great_rand(){
 $str = '1234567890abcdefghijklmnopqrstuvwxyz';
 for($i=0;$i<30;$i++){
  $j=rand(0,35);
  $t1 .= $str[$j];
 }
 return $t1; 
}

Signature algorithm:

/**
例如：
appid： wxd111665abv58f4f
mch_id： 10000100
device_info： 1000
Body： test
nonce_str： ibuaiVcKdpRxkhJA
第一步：對參數(shù)按照 key=value 的格式，并按照參數(shù)名 ASCII 字典序排序如下：
stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_i
d=10000100&nonce_str=ibuaiVcKdpRxkhJA";
第二步：拼接支付密鑰：
stringSignTemp="stringA&key=192006250b4c09247ec02edce69f6a2d"
sign=MD5(stringSignTemp).toUpperCase()="9A0A8659F005D6984697E2CA0A
9CF3B7"
*/
protected function get_sign(){
 define('PARTNERKEY',"QSRXXXXXXXXXXXXXXXXXXXXX");
 try {
  if (null == PARTNERKEY || "" == PARTNERKEY ) {
   throw new SDKRuntimeException("密鑰不能為空！" . "<br>");
  }
  if($this->check_sign_parameters() == false) { //檢查生成簽名參數(shù)
   throw new SDKRuntimeException("生成簽名參數(shù)缺失！" . "<br>");
  }
  $commonUtil = new CommonUtil();
  ksort($this->parameters);
  $unSignParaString = $commonUtil->formatQueryParaMap($this->parameters, false);
  $md5SignUtil = new MD5SignUtil();
  return $md5SignUtil->sign($unSignParaString,$commonUtil->trimString(PARTNERKEY));
 }catch (SDKRuntimeException $e)
 {
  die($e->errorMessage());
 }
 
}

CURL request and send certificate:

function curl_post_ssl($url, $vars, $second=30,$aHeader=array())
{
 $ch = curl_init();
 //超時時間
 curl_setopt($ch,CURLOPT_TIMEOUT,$second);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
 //這里設(shè)置代理，如果有的話
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
 curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);  
 //cert 與 key 分別屬于兩個.pem文件
 //請確保您的libcurl版本是否支持雙向認證，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;
 }
}

Entry file:

@require "pay.php";
//獲取用戶信息
$get = $_GET['param'];
$code = $_GET['code'];
//判斷code是否存在
if($get=='access_token' && !empty($code)){
 $param['param'] = 'access_token';
 $param['code'] = $code;
 $packet = new Packet();
 //獲取用戶openid信息
 $userinfo = $packet->_route('userinfo',$param);
 if(empty($userinfo['openid'])){
  exit("NOAUTH");
 }
 //調(diào)取支付方法
 $packet->_route('wxpacket',array('openid'=>$userinfo['openid']));
}else{
 $packet->_route('userinfo');
}

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