微信红包API接口（PHP）

根据微信高级红包接口，开发PHP版本的API接口，现在进行主要代码分析。

红包接口调用请求代码，所有请求参数为必填参数与文档对应：

class Wxapi {
    private $app_id = 'wxXXXXXXXXXXXX'; //公众账号appid，首先申请与之配套的公众账号
    private $app_secret = 'XXXXXXXXXXXXXXXXXXXXXXXX';//公众号secret，用户获取用户授权token
    private $app_mchid = 'XXXXXXXX';//商户号id
    function __construct(){
    //do sth here....
    }
    public function pay($re_openid)
    {
        include_once('WxHongBaoHelper.php');
        $commonUtil = new CommonUtil();
        $wxHongBaoHelper = new WxHongBaoHelper();
        $wxHongBaoHelper->setParameter("nonce_str", $this->great_rand());//随机字符串，丌长于 32 位
        $wxHongBaoHelper->setParameter("mch_billno", $this->app_mchid.date('YmdHis').rand(1000, 9999));//订单号
        $wxHongBaoHelper->setParameter("mch_id", $this->app_mchid);//商户号
        $wxHongBaoHelper->setParameter("wxappid", $this->app_id);
        $wxHongBaoHelper->setParameter("nick_name", '红包');//提供方名称
        $wxHongBaoHelper->setParameter("send_name", '红包');//红包发送者名称
        $wxHongBaoHelper->setParameter("re_openid", $re_openid);//相对于医脉互通的openid
        $wxHongBaoHelper->setParameter("total_amount", 100);//付款金额，单位分
        $wxHongBaoHelper->setParameter("min_value", 100);//最小红包金额，单位分
        $wxHongBaoHelper->setParameter("max_value", 100);//最大红包金额，单位分
        $wxHongBaoHelper->setParameter("total_num", 1);//红包収放总人数
        $wxHongBaoHelper->setParameter("wishing", '感谢您参与红包派发活动，祝您新年快乐！');//红包祝福诧
        $wxHongBaoHelper->setParameter("client_ip", '127.0.0.1');//调用接口的机器 Ip 地址
        $wxHongBaoHelper->setParameter("act_name", '红包活动');//活劢名称
        $wxHongBaoHelper->setParameter("remark", '快来抢！');//备注信息
        $postXml = $wxHongBaoHelper->create_hongbao_xml();
        $url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack';
        $responseXml = $wxHongBaoHelper->curl_post_ssl($url, $postXml);
        //用作结果调试输出
        //echo htmlentities($responseXml,ENT_COMPAT,'UTF-8');
    $responseObj = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
    return $responseObj->return_code;
    }

获取随机字符串方法：

public function great_rand(){
    $str = '1234567890abcdefghijklmnopqrstuvwxyz';
    for($i=0;$i<30;$i++){
        $j=rand(0,35);
        $t1 .= $str[$j];
    }
    return $t1;    
}

签名算法：

protected function get_sign(){
    define('PARTNERKEY',"QSRXXXXXXXXXXXXXXXXXXXXX");
    try {
        if (null == PARTNERKEY || "" == PARTNERKEY ) {
           throw new SDKRuntimeException("密钥不能为空！" . " ");
        }
        if($this->check_sign_parameters() == false) {   //检查生成签名参数
           throw new SDKRuntimeException("生成签名参数缺失！" . " ");
        }
        $commonUtil = new CommonUtil();
        ksort($this->parameters);
        $unSignParaString = $commonUtil->formatQueryParaMap($this->parameters, false);
        $md5SignUtil = new MD5SignUtil();
        return $md5SignUtil->sign($unSignParaString,$commonUtil->trimString(PARTNERKEY));
    }catch (SDKRuntimeException $e)
    {
        die($e->errorMessage());
    }
}

CURL请求以及发送证书：

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:$error
"; 
        curl_close($ch);
        return false;
    }
}

入口文件：

@require "pay.php";
//获取用户信息
$get = $_GET['param'];
$code = $_GET['code'];
//判断code是否存在
if($get=='access_token' && !empty($code)){
    $param['param'] = 'access_token';
    $param['code'] = $code;
    $packet = new Packet();
    //获取用户openid信息
    $userinfo = $packet->_route('userinfo',$param);
    if(empty($userinfo['openid'])){
        exit("NOAUTH");
    }
    //调取支付方法
    $packet->_route('wxpacket',array('openid'=>$userinfo['openid']));
}else{
    $packet->_route('userinfo');
}