php实现微信支付之现金红包

网上的很多PHP微信支付接入教程都颇为复杂，且需要配置和引入较多的文件，本人通过整理后给出一个单文件版的，希望可以给各位想接入微信支付的带来些许帮助和借鉴意义。

直接运行该文件即可给指定的微信用户发送现金红包。

需要注意的事项：

1.微信现金红包要求必传证书，需要到这里账户中心->账户设置->API安全->下载证书，然后修改代码中的证书路径

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.该文件需放到支付授权目录下，可以在微信支付商户平台->产品中心->开发配置中设置。

4.如提示签名错误可以通过微信支付签名验证工具进行验证：微信公众平台支付接口调试工具

5.错误码参照：地址

代码如下：

GetOpenid(); //获取openid
if(!$openId) exit('获取openid失败');
//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 = '织梦猫'; //红包发送者名称
$wishing = '感谢您参加猜灯谜活动，祝您元宵节快乐！'; //红包祝福语
$act_name='猜灯谜抢红包活动';  //活动名称
$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;
 }

 
 public function GetOpenid()
 {
 //通过code获得openid
 if (!isset($_GET['code'])){
  //触发微信返回code码
  $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 {
  //获取code码，以获取openid
  $code = $_GET['code'];
  $openid = $this->getOpenidFromMp($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;
 }

 
 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;
 }

 
 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;
 }

 
 private function ToUrlParams($urlObj)
 {
 $buff = "";
 foreach ($urlObj as $k => $v)
 {
  if($k != "sign") $buff .= $k . "=" . $v . "&";
 }
 $buff = trim($buff, "&");
 return $buff;
 }

 
 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), //单位 转为分
  'total_num'=>1,   //红包发放总人数
  'wishing'=>$wishing,  //红包祝福语
  'act_name'=>$actName,  //活动名称
  'remark'=>'remark',  //备注信息，如为中文注意转为UTF8编码
  'scene_id'=>'PRODUCT_2', //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
 );
 $unified['sign'] = self::getSign($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 = '', $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); //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($ch,CURLOPT_SSLCERTTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem');
 //默认格式为PEM，可以注释
 curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem');
 //第二种方式，两个文件合成一个.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)
 {
 $xml = "";
 foreach ($arr as $key => $val) {
  if (is_numeric($val)) {
  $xml .= "<" . $key . ">" . $val . "";
  } else
  $xml .= "<" . $key . ">";
 }
 $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;
 }
}
?>

github下载地址：weixinPay

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