本文实例讲述了PHP开发的微信现金红包功能。分享给大家供大家参考，具体如下：

微信商家后台-现金红包开发

sdk

<?php

class wxPay {

  //配置参数信息

  const SHANGHUHAO = "1430998xxx";//商户号

  const PARTNERKEY = "leFyTOXWzUEXxfp47WOu5d9xxxxxx";  //api，商户后台

  //核心支付函数,参数：请求地址和参数

  function pay($url,$obj) {

    $obj['nonce_str'] = $this->create_noncestr();  //创建随机字符串

    $stringA = $this->create_qianming($obj,false);  //创建签名

    $stringSignTemp = $stringA."&key=leFyTOXWzUEXxfp47WOu5xxxxxx";  //签名后加api

    $sign = strtoupper(md5($stringSignTemp));  //签名加密并大写

    $obj['sign'] = $sign;  //将签名传入数组

    $postXml = $this->arrayToXml($obj);  //将参数转为xml格式

    var_dump($postXml);

    $responseXml = $this->curl_post_ssl($url,$postXml);  //提交请求

    var_dump($responseXml);

    return $responseXml;

  }

  //生成签名,参数：生成签名的参数和是否编码

  function create_qianming($arr,$urlencode) {

    $buff = "";

    ksort($arr); //对传进来的数组参数里面的内容按照字母顺序排序，a在前面，z在最后（字典序）

    foreach ($arr as $k=>$v) {

      if(null!=$v && "null" != $v && "sign" != $k) {  //签名不要转码

        if ($urlencode) {

          $v = urlencode($v);

        }

        $buff.=$k."=".$v."&";

      }

    }

    if (strlen($buff)>0) {

      $reqPar = substr($buff,0,strlen($buff)-1); //去掉末尾符号“&”

    }

    return $reqPar;

  }

  //生成随机字符串，默认32位

  function create_noncestr($length=32) {

    //创建随机字符

    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    $str = "";

    for($i=0;$i<$length;$i++) {

      $str.=substr($chars, mt_rand(0,strlen($chars)-1),1);

    }

    return $str;

  }

  //数组转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请求网站，需要证书

  function curl_post_ssl($url, $vars, $second=30,$aHeader=array())

  {

    $ch = curl_init();

    //超时时间

    curl_setopt($ch,CURLOPT_TIMEOUT,$second);

    curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);

    //这里设置代理，如果有的话

    curl_setopt($ch,CURLOPT_URL,$url);

    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);

    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);

    //cert 与 key 分别属于两个.pem文件

    //请确保您的libcurl版本是否支持双向认证，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;

    }

  }

}

证书文件：

请在微信商户后台-API安全下载，PHP请使用php的证书文件

微信红包调用测试文件：

<?php

require 'wxpay.class.php';<br><br>//数组参数

$money = 100; //最低1元，单位分

$sender = "晨缘房产";

$obj2 = array();

$obj2['wxappid'] = ""; //appid

$obj2['mch_id'] = "";　　//商户id

$obj2['mch_billno'] = "商户id".date('YmdHis').rand(1000,9999);　　//组合成28位，根据官方开发文档，可以自行设置

$obj2['client_ip'] = $_SERVER['REMOTE_ADDR'];

$obj2['re_openid'] = "oUxO6v26wdyMHThD9kfDW6NB_xbE";　　//接收红包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'] = "恭喜发财";

$obj2['act_name'] = $sender."红包";

$obj2['remark'] = $sender."红包";

$url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";

$wxpay = new wxPay();

$res = $wxpay->pay($url, $obj2);

var_dump($res);

以上所述是小编给大家介绍的，希望对大家有所帮