?php
class wxPay {
  //配置參數信息
  const SHANGHUHAO = "1430998xxx";//商戶號
  const PARTNERKEY = "leFyTOXWzUEXxfp47WOu5d9xxxxxx";  //api，商戶后臺
  //核心支付函數,參數：請求地址和參數
  function pay($url,$obj) {
    $obj['nonce_str'] = $this->create_noncestr();  //創建隨機字符串
    $stringA = $this->create_qianming($obj,false);  //創建簽名
    $stringSignTemp = $stringA."key=leFyTOXWzUEXxfp47WOu5xxxxxx";  //簽名后加api
    $sign = strtoupper(md5($stringSignTemp));  //簽名加密并大寫
    $obj['sign'] = $sign;  //將簽名傳入數組
    $postXml = $this->arrayToXml($obj);  //將參數轉為xml格式
    var_dump($postXml);  
    $responseXml = $this->curl_post_ssl($url,$postXml);  //提交請求
    var_dump($responseXml);
    return $responseXml;
  }
  
  //生成簽名,參數：生成簽名的參數和是否編碼
  function create_qianming($arr,$urlencode) {
    $buff = "";
    ksort($arr); //對傳進來的數組參數里面的內容按照字母順序排序，a在前面，z在最后（字典序）
    foreach ($arr as $k=>$v) {
      if(null!=$v  "null" != $v  "sign" != $k) {  //簽名不要轉碼
        if ($urlencode) {
          $v = urlencode($v);
        }
        $buff.=$k."=".$v."";
      }
    }
    if (strlen($buff)>0) {  
      $reqPar = substr($buff,0,strlen($buff)-1); //去掉末尾符號“”
    }
    return $reqPar;
  }
  
  //生成隨機字符串，默認32位
  function create_noncestr($length=32) {
    //創建隨機字符
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    $str = "";
    for($i=0;$i$length;$i++) {
      $str.=substr($chars, mt_rand(0,strlen($chars)-1),1);
    }
    return $str;  
  }
  //數組轉xml
  function arrayToXml($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請求網站，需要證書
  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;
    }
  }
  
}

?php
require 'wxpay.class.php';br>br>//數組參數
$money = 100; //最低1元，單位分
$sender = "晨緣房產";
$obj2 = array();
$obj2['wxappid'] = ""; //appid
$obj2['mch_id'] = "";　　//商戶id
$obj2['mch_billno'] = "商戶id".date('YmdHis').rand(1000,9999);　　//組合成28位，根據官方開發文檔，可以自行設置
$obj2['client_ip'] = $_SERVER['REMOTE_ADDR'];
$obj2['re_openid'] = "oUxO6v26wdyMHThD9kfDW6NB_xbE";　　//接收紅包openid
$obj2['total_amount'] = $money;
$obj2['min_value'] = $money;
$obj2['max_value'] = $money;
$obj2['total_num'] = 1;
$obj2['nick_name'] = $sender;
$obj2['send_name'] = $sender;
$obj2['wishing'] = "恭喜發財";
$obj2['act_name'] = $sender."紅包";
$obj2['remark'] = $sender."紅包";
 
$url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
$wxpay = new wxPay();
$res = $wxpay->pay($url, $obj2);
var_dump($res);