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：

<?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("Content-type:text/html; Charset=utf-8");$mchid = "xxxxx";  //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送$appid = "xxxxx"; //微信支付申请对应的公众号的APPID$appKey = "xxxxx"; //微信支付申请对应的公众号的APP Key$apiKey = "xxxxx"; //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 = $wxPay->GetOpenid(); //获取openidif(!$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 = $key; } /** * 通过跳转获取用户的openid，跳转流程如下： * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code * @return 用户的openid */ public function GetOpenid() { //通过code获得openid if (!isset($_GET["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; } } /** * 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["openid"]; 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(  "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) { $xml = "<xml>"; foreach ($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; }}?>

github下载地址：weixinPay

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