?php
/**
 * 關于微信現金紅包的說明
 * 1.微信現金紅包要求必傳證書，需要到https://pay.weixin.qq.com 賬戶中心->賬戶設置->API安全->下載證書，證書路徑在第214行和217行修改
 * 2.默認的使用場景是抽獎（即scene_id參數為PRODUCT_2），額度是1-200元，所以測試時的最低金額是1元。如需修改在產品中心->產品大全->現金紅包->產品設置中修改
 * 3.錯誤碼參照 ：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4index=3
 */
header('Content-type:text/html; Charset=utf-8');
$mchid = 'xxxxx';  //微信支付商戶號 PartnerID 通過微信支付商戶資料審核后郵件發送
$appid = 'xxxxx'; //微信支付申請對應的公眾號的APPID
$appKey = 'xxxxx'; //微信支付申請對應的公眾號的APP Key
$apiKey = 'xxxxx'; //https://pay.weixin.qq.com 帳戶設置-安全設置-API安全-API密鑰-設置API密鑰

//①、獲取當前訪問頁面的用戶openid（如果給指定用戶發送紅包，則填寫指定用戶的openid)
$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);
$openId = $wxPay->GetOpenid(); //獲取openid
if(!$openId) exit('獲取openid失敗');
//②、發送紅包
$outTradeNo = uniqid(); //你自己的商品訂單號
$payAmount = 1;  //紅包金額，單位:元
$sendName = '織夢貓'; //紅包發送者名稱
$wishing = '感謝您參加猜燈謎活動，祝您元宵節快樂！'; //紅包祝福語
$act_name='猜燈謎搶紅包活動';  //活動名稱
$result = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$sendName,$wishing,$act_name);
echo 'success';

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;
 }

 /**
 * 通過跳轉獲取用戶的openid，跳轉流程如下：
 * 1、設置自己需要調回的url及其其他參數，跳轉到微信服務器https://open.weixin.qq.com/connect/oauth2/authorize
 * 2、微信服務處理完成之后會跳轉回用戶redirect_uri地址，此時會帶上一些參數，如：code
 * @return 用戶的openid
 */
 public function GetOpenid()
 {
 //通過code獲得openid
 if (!isset($_GET['code'])){
  //觸發微信返回code碼
  $scheme = $_SERVER['HTTPS']=='on' ? 'https://' : 'http://';
  $baseUrl = urlencode($scheme.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].$_SERVER['QUERY_STRING']);
  $url = $this->__CreateOauthUrlForCode($baseUrl);
  Header("Location: $url");
  exit();
 } else {
  //獲取code碼，以獲取openid
  $code = $_GET['code'];
  $openid = $this->getOpenidFromMp($code);
  return $openid;
 }
 }

 /**
 * 通過code從工作平臺獲取openid機器access_token
 * @param string $code 微信跳轉回來帶上的code
 * @return openid
 */
 public function GetOpenidFromMp($code)
 {
 $url = $this->__CreateOauthUrlForOpenid($code);
 $res = self::curlGet($url);
 //取出openid
 $data = json_decode($res,true);
 $this->data = $data;
 $openid = $data['openid'];
 return $openid;
 }

 /**
 * 構造獲取open和access_toke的url地址
 * @param string $code，微信跳轉帶回的code
 * @return 請求的url
 */
 private function __CreateOauthUrlForOpenid($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;
 }

 /**
 * 構造獲取code的url連接
 * @param string $redirectUrl 微信服務器回跳的url，需要url編碼
 * @return 返回構造好的url
 */
 private function __CreateOauthUrlForCode($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;
 }

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

 /**
 * 發送紅包
 * @param string $openid 用戶在該公眾號下的Openid
 * @param float $totalFee 紅包金額 單位元
 * @param string $outTradeNo 訂單號
 * @param string $orderName 紅包發送者名稱
 * @param string $wishing 祝福語
 * @param string $actName 互動名稱
 * @return string
 */
 public function createJsBizPackage($openid, $totalFee, $outTradeNo, $sendName,$wishing,$actName)
 {
 $config = array(
  'mch_id' => $this->mchid,
  'appid' => $this->appid,
  'key' => $this->apiKey,
 );
 $unified = array(
  'wxappid' => $config['appid'],
  'send_name' => $sendName,
  'mch_id' => $config['mch_id'],
  'nonce_str' => self::createNonceStr(),
  're_openid' => $openid,
  'mch_billno' => $outTradeNo,
  'client_ip' => '127.0.0.1',
  'total_amount' => intval($totalFee * 100), //單位 轉為分
  'total_num'=>1,   //紅包發放總人數
  'wishing'=>$wishing,  //紅包祝福語
  'act_name'=>$actName,  //活動名稱
  'remark'=>'remark',  //備注信息，如為中文注意轉為UTF8編碼
  'scene_id'=>'PRODUCT_2', //發放紅包使用場景，紅包金額大于200時必傳。https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4index=3
 );
 $unified['sign'] = self::getSign($unified, $config['key']);
 $responseXml = $this->curlPost('https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack', self::arrayToXml($unified));
 $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
 if ($unifiedOrder === false) {
  die('parse xml error');
 }
 if ($unifiedOrder->return_code != 'SUCCESS') {
  die($unifiedOrder->return_msg);
 }
 if ($unifiedOrder->result_code != 'SUCCESS') {
  die($unifiedOrder->err_code);
 }
 return true;
 }

 public static function curlGet($url = '', $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, $options);
 }
 //https請求 不驗證證書和host
 curl_setopt($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 = '', $postData = '', $options = array())
 {
 if (is_array($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); //設置cURL允許執行的最長秒數
 if (!empty($options)) {
  curl_setopt_array($ch, $options);
 }
 //https請求 不驗證證書和host
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

 //第一種方法，cert 與 key 分別屬于兩個.pem文件
 //默認格式為PEM，可以注釋
 curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem');
 //默認格式為PEM，可以注釋
 curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem');
 //第二種方式，兩個文件合成一個.pem文件
// curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }

 public static function createNonceStr($length = 16)
 {
 $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 $str = '';
 for ($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 . "";
  }
 }
 $reqPar = '';
 if (strlen($buff) > 0) {
  $reqPar = substr($buff, 0, strlen($buff) - 1);
 }
 return $reqPar;
 }
}
?>