php微信发红包算法

代码如下：

<?php
/**
 * 微信红包的类 
 * 
 */

CLASS WXHongBao {
  
  private $mch_id = "111111";//商户ID写死
  private $wxappid = "22222222";//微信公众号，写死
  private $client_ip = "119.29.80.114"; //调用红包接口的主机的IP,服务端IP,写死，即脚本文件所在的IP
  private $apikey = "33333333";//pay的秘钥值
  private $total_num = 1;//发放人数。固定值1，不可修改  
  private $nick_name = "微信产品中心公众号"; //红包商户名称
  private $send_name = "微信产品中心公众号";//红包派发者名称
  private $wishing = "祝福语"; //  
  private $act_name = "红包活动"; //活动名称
  private $remark = "活动备注";
  private $nonce_str = "";
  private $mch_billno = "";
  private $re_openid = "";//接收方的openID  
  private $total_amount = 1 ;//红包金额，单位 分
  private $min_value = 1;//最小金额
  private $max_value = 1; //根据接口要求，上述3值必须一致       
  private $sign = ""; //签名在send时生成  
  private $amt_type; //分裂红包参数，在sendgroup中进行定义，是常量 ALL_RAND 
  
  //证书，在构造函数中定义，注意！
  private $apiclient_cert; //= getcwd()."/apiclient_cert.pem";
  private $apiclient_key;// = getcwd()."/apiclient_key.pem";
  
  //分享参数
  private $isShare = false; //有用？似乎是无用参数，全部都不是必选和互相依赖的参数
  private $share_content = ""; 
  private $share_url ="";
  private $share_imgurl = "";
  
  private $wxhb_inited;
  
  private $api_hb_group = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendgroupredpack";//裂变红包
  private $api_hb_single = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
  
  private $error = "ok"; //init
  


  /**
   * WXHongBao::__construct()
   * 步骤
   * new(openid,amount)
   * setnickname
   * setsend_name
   * setwishing
   * setact_name
   * setremark
   * send()
   * @return void
   */
  function __construct(){
    //好像没有什么需要构造函数做的
    $this->wxhb_inited = false; 
    $this->apiclient_cert = getcwd()."/apiclient_cert.pem";
    $this->apiclient_key = getcwd()."/apiclient_key.pem";
  }
  
  public function err(){
    return $this->error;
  } 
  public function error(){
    return $this->err();
  }
  /**
   * WXHongBao::newhb()
   * 构造新红包 
   * @param mixed $toOpenId
   * @param mixed $amount 金额分
   * @return void
   */
  public function newhb($toOpenId,$amount){
     
    if(!is_numeric($amount)){
      $this->error = "金额参数错误";
      return;
    }elseif($amount<100){
      $this->error = "金额太小";
      return;
    }elseif($amount>20000){
      $this->error = "金额太大";
      return;
    }
    
    $this->gen_nonce_str();//构造随机字串
    $this->gen_mch_billno();//构造订单号
    $this->setOpenId($toOpenId);
    $this->setAmount($amount);
    $this->wxhb_inited = true; //标记微信红包已经初始化完毕可以发送
    
    //每次new 都要将分享的内容给清空掉，否则会出现残余被引用
    $this->share_content= "";
    $this->share_imgurl = "";
    $this->share_url = "";
  }
  
  /**
   * WXHongBao::send()
   * 发出红包
   * 构造签名
   * 注意第二参数，单发时不要改动！
   * @return boolean $success
   */              
  public function send($url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack",$total_num = 1){
  
    if(!$this->wxhb_inited){
      $this->error .= "(红包未准备好)";
      return false; //未初始化完成
    }
    
    $this->total_num = $total_num;
    
    $this->gen_Sign(); //生成签名
    
    //构造提交的数据    
    $xml = $this->genXMLParam();
    
    
    //debug
    file_put_contents("hbxml.txt",$xml);
    
    //提交xml,curl
    //$url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
    $ch = curl_init();    
    curl_setopt($ch,CURLOPT_TIMEOUT,10);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);    
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
    
    curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
    curl_setopt($ch,CURLOPT_SSLCERT,$this->apiclient_cert);    
    curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
    curl_setopt($ch,CURLOPT_SSLKEY,$this->apiclient_key);
    
    /* 
    if( count($aHeader) >= 1 ){
      curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
    }
    */    
    curl_setopt($ch,CURLOPT_POST, 1);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);
    $data = curl_exec($ch);
    if($data){
      curl_close($ch);  
      $rsxml = simplexml_load_string($data);
      if($rsxml->return_code == 'SUCCESS' ){
        return true;
      }else{
        $this->error = $rsxml->return_msg;
        return false;  
      }
      
    }else{ 
      $this->error = curl_errno($ch);
       
      curl_close($ch);
      return false;
    }

  }
  
  /**
   * WXHongBao::sendGroup()
   * 发送裂变红包,参数为裂变数量
   * @param integer $num 3-20
   * @return
   */
  public function sendGroup($num=3){
    $this->amt_type = "ALL_RAND";//$amt; 固定值。发送裂变红包组文档指定参数，随机
    return $this->send($this->api_hb_group,$num);
  }
  
  public function getApiSingle(){
    return $this->api_hb_single;
  }
  
  public function getApiGroup(){
    return $this->api_hb_group;
  }
  
  public function setNickName($nick){
    $this->nick_name = $nick;
  }
  
  public function setSendName($name){
    $this->send_name = $name;
  }
  
  public function setWishing($wishing){
    $this->wishing = $wishing;
  }
  
  /**
   * WXHongBao::setActName()
   * 活动名称 
   * @param mixed $act
   * @return void
   */
  public function setActName($act){
    $this->act_name = $act;
  }
  
  public function setRemark($remark){
    $this->remark = $remark;
  }
  
  public function setOpenId($openid){
    $this->re_openid = $openid;
  }
  
  /**
   * WXHongBao::setAmount()
   * 设置红包金额
   * 文档有两处冲突描述 
   * 一处指金额 >=1 (分钱)
   * 另一处指金额 >=100 < 20000 [1-200元]
   * 有待测试验证！
   * @param mixed $price 单位 分
   * @return void
   */
  public function setAmount($price){
    $this->total_amount = $price;
    $this->min_value = $price;
    $this->max_value = $price;
  }
  //以下方法，为设置分裂红包时使用
  public function setHBminmax($min,$max){
    $this->min_value = $min;
    $this->max_value = $max;
  }
  
  
  public function setShare($img="",$url="",$content=""){
    
    //https://mmbiz.qlogo.cn/mmbiz/MS1jaDO92Ep4qNo9eV0rnItptyBrzUhJqT8oxSsCofdxibnNWMJiabaqgLPkDaEJmia6fqTXAXulKBa9NLfxYMwYA/0?wx_fmt=png
    //http://mp.weixin.qq.com/s?__biz=MzA5Njg4NTk3MA==&mid=206257621&idx=1&sn=56241da30e384e40771065051e4aa6a8#rd
    $this->share_content = $content;
    $this->share_imgurl = $img;
    $this->share_url = $url;
  }
  
  private function gen_nonce_str(){
    $this->nonce_str = strtoupper(md5(mt_rand().time())); //确保不重复而已
  }
  
  private function gen_Sign(){
    unset($param); 
    //其实应该用key重排一次 right?
    $param["act_name"]=$this->act_name;//
    
    if($this->total_num==1){ //这些是裂变红包用不上的参数，会导致签名错误
      $param["client_ip"]=$this->client_ip;
      $param["max_value"]=$this->max_value;
      $param["min_value"]=$this->min_value;
      $param["nick_name"]=$this->nick_name;
    }
    
    $param["mch_billno"] = $this->mch_billno;  //   
    $param["mch_id"]=$this->mch_id;//    
    $param["nonce_str"]=$this->nonce_str;  //  
    $param["re_openid"]=$this->re_openid;//
    $param["remark"]=$this->remark;    //
    $param["send_name"]=$this->send_name;//
    $param["total_amount"]=$this->total_amount;//
    $param["total_num"]=$this->total_num;    //
    $param["wishing"]=$this->wishing;//
    $param["wxappid"]=$this->wxappid;//
    
    if($this->share_content) $param["share_content"] = $this->share_content;
    if($this->share_imgurl) $param["share_imgurl"] = $this->share_imgurl;
    if($this->share_url) $param["share_url"] = $this->share_url;
    
    if($this->amt_type) $param["amt_type"] = $this->amt_type; //
    
    ksort($param); //按照键名排序...艹，上面排了我好久
    
    //$sign_raw = http_build_query($param)."&key=".$this->apikey;
    $sign_raw = "";
    foreach($param as $k => $v){
      $sign_raw .= $k."=".$v."&";
    }
    $sign_raw .= "key=".$this->apikey;
    
    //file_put_contents("sign.raw",$sign_raw);//debug
    $this->sign = strtoupper(md5($sign_raw));
  }
  
  /**
   * WXHongBao::genXMLParam()
   * 生成post的参数xml数据包
   * 注意生成之前各项值要生成，尤其是Sign
   * @return $xml
   */
  public function genXMLParam(){
    
    $xml = "<xml>
      <sign>".$this->sign."</sign> 
      <mch_billno>".$this->mch_billno."</mch_billno> 
      <mch_id>".$this->mch_id."</mch_id> 
      <wxappid>".$this->wxappid."</wxappid> 
      <nick_name><![CDATA[".$this->nick_name."]]></nick_name> 
      <send_name><![CDATA[".$this->send_name."]]></send_name> 
      <re_openid>".$this->re_openid."</re_openid> 
      <total_amount>".$this->total_amount."</total_amount> 
      <min_value>".$this->min_value."</min_value> 
      <max_value>".$this->max_value."</max_value> 
      <total_num>".$this->total_num."</total_num> 
      <wishing><![CDATA[".$this->wishing."]]></wishing> 
      <client_ip><![CDATA[".$this->client_ip."]]></client_ip> 
      <act_name><![CDATA[".$this->act_name."]]></act_name> 
      <remark><![CDATA[".$this->remark."]]></remark>       
      <nonce_str>".$this->nonce_str."</nonce_str>
      "; 
    
      
    if($this->share_content) $xml .= "<share_content><![CDATA[".$this->share_content."]]></share_content>
    ";
    if($this->share_imgurl) $xml .= "<share_imgurl><![CDATA[".$this->share_imgurl."]]></share_imgurl>
    ";
    if($this->share_url) $xml .= "<share_url><![CDATA[".$this->share_url."]]></share_url>
    ";
    if($this->amt_type) $xml .= "<amt_type><![CDATA[".$this->amt_type."]]></amt_type>
    ";
    
    $xml .="</xml>";
    
    return $xml;
  }
  
  /**
   * WXHongBao::gen_mch_billno()
   * 商户订单号（每个订单号必须唯一） 
    组成： mch_id+yyyymmdd+10位一天内不能重复的数字。 
    接口根据商户订单号支持重入， 如出现超时可再调用。 
   * @return void
   */
  private function gen_mch_billno(){
    //生成一个长度10，的阿拉伯数字随机字符串
    $rnd_num = array('0','1','2','3','4','5','6','7','8','9');
    $rndstr = "";
    while(strlen($rndstr)<10){
      $rndstr .= $rnd_num[array_rand($rnd_num)];  
    }
    
    $this->mch_billno = $this->mch_id.date("Ymd").$rndstr;
  }
}　　　　
?>

然后实例化class.

　　 $toOpenId = 'asdasdasd'; //接收红包的用户的微信OpenId
    $hb = new WXHongBao();

    $hb->newhb($toOpenId,1000); //新建一个10元的红包，第二参数单位是 分，注意取值范围 1-200元
    //以下若干项可选操作，不指定则使用class脚本顶部的预设值
     $hb->setNickName("土豪有限公司");
     $hb->setSendName("土豪");
     $hb->setWishing("恭喜发财");
     $hb->setActName("发钱活动");
     $hb->setRemark("任性一把");

    //发送红包

    if(!$hb->send()){ //发送错误

      echo $hb->err();

    }else{

      echo "红包发送成功";

    }

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