基于H5的微信支付开发详解
这次总结一下用户在微信内打开网页时，可以调用微信支 付完成下单功能的模块开发，也就是在微信内的H5页面通过jsApi接口实现支付功能。当然了，微信官网上的微信支付开发文档也讲解的很详细，并且有实现 代码可供参考，有的朋友直接看文档就可以自己实现此支付接口的开发了。一、前言
为何我还写一篇微信支付接口的博文呢？第一，我们 必须知道，所谓的工作经验很多都是靠总结出来的，你只有总结了更多知识，积累了更多经验，你才能在该行业中脱颖而出，我个人觉得如今的招聘，很多都需要工 作经验（1年、3年、5年....），其实，工作时间的长久不能衡量一个人技术水平的高低，有的人一年的工作经验能拿3年工作经验的程序猿的工资，有的3 年工作经验的却有可能比别人只有一年工作经验的还低，所以说，总结才能让自己的知识体系，经验深度更牛逼更稳固（虽然写一篇博文挺花费时间的）；第二，写 博文分享给大家还是挺有成就感的，首先是能让新手从我分享的博文中能学到东西，并且能快速将博文所讲解的技术运用到实际中来，所以我写的博文基本上能让新 人快速读懂并且容易理解，另外，技术大神的话，看到博文有讲解的不对之处，还可以指出，并且可以交流，何乐而不为呢，我们需要的就是分享和交流。
扯远了，直接进入该主题的详解。
现在的微信支付方式有N种，看下图，有刷卡支付、 公众号支付、扫码支付和APP支付，另外还有支付工具的开发，本博文选择的是公众号支付借口而开发进行讲解，其他几种支付接口开发基本上思路都是一样的， 只要你能看懂我这博文所讲解的基本思路，你基本上也能独自开发其他几个支付接口。
二、思路详解
我们可以拿微信支付接口文档里的业务流程时序图看 看，如下图，基本思路是这样子：首先在后台生成一个链接，展示给用户让用户点击（例如页面上有微信支付的按钮），用户点击按钮后，网站后台会根据订单的相 关信息生成一个支付订单，此时会调用统一下单接口，对微信支付系统发起请求，而微信支付系统受到请求后，会根据请求过来的数据，生成一个 预支付交易会话标识（prepay_id，就是通过这个来识别该订单的），我们的网站收到微信支付系统的响应后，会得到prepay_id，然后通过自己 构造微信支付所需要的参数，接着将支付所需参数返回给客户端，用户此时可能会有一个订单信息页，会有一个按钮，点击支付，此时会调用JSAPI接口对微信 支付系统发起 请求支付，微信支付系统检查了请求的相关合法性之后，就会提示输入密码，用户此时输入密码确认，微信支付系统会对其进行验证，通过的话会返回支付结果，然 后微信跳转会H5页面，这其中有一步是异步通知网站支付结果，我们网站需要对此进行处理（比如说异步支付结果通过后，需要更新数据表或者订单信息，例如标 志用户已支付该订单了，同时也需要更新订单日志，防止用户重复提交订单）。
三、代码讲解
本次开发环境用的是php5.6 + MySQL + Redis + Linux + Apache，所选用的框架的CI框架（这些环境不一定需要和我的一致，框架也可以自己选择，反正自己稍微修改下代码就能移植过去了）。
微信支付接口的开发代码我已经提前写好了，在这里我对其进行分析讲解，方便大家能轻松理解，当然，假如你有一定的基础，直接看代码就能理清所有流程了，并且我的代码基本上都写上了注释（对于新手来说，这一点比微信文档所提供的代码好一点）。
1、构造一个链接展示给用户
这里我们提前需要知道一个点，那就是请求统一下单接口需要微信用户的openid（详情可看这https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1），而获取openid需要先获取code（详情可看这微信登录接口），所以我们需要构造一个获取code的URL：
[*]Wxpay.php文件：
[*]<?php
[*]defined('BASEPATH') OR exit('No direct script access allowed');
[*]
[*]class Wxpay extends MY_Controller {
[*] public function __construct() {
[*] parent::__construct();
[*] $this->load->model('wxpay_model');
[*] //$this->load->model('wxpay');
[*]
[*] }
[*]
[*] public function index() {
[*] //微信支付
[*] $this->smarty['wxPayUrl'] = $this->wxpay_model->retWxPayUrl();
[*] $this->displayView('wxpay/index.tpl');
[*] }
[*]}
在这先看看model里所写的几个类：model里有几个类：微信支付类、统一下单接口类、响应型接口基类、请求型接口基类、所有接口基类、配置类。为何要分那么多类而不在一个类里实现所有的方法的，因为，这样看起来代码逻辑清晰，哪个类该干嘛就干嘛。
这里我直接附上model的代码了,里面基本上每一个类每一个方法甚至每一行代码都会有解释的了，这里我就不对其展开一句句分析了：
[*]<?php
[*]defined('BASEPATH') OR exit('No direct script access allowed');
[*]
[*]class Wxpay_model extends CI_Model {
[*] public function __construct() {
[*] parent::__construct();
[*] }
[*]
[*] /**
[*] * 返回可以获得微信code的URL （用以获取openid）
[*] * @return
[*] */
[*] public function retWxPayUrl() {
[*] $jsApi = new JsApi_handle();
[*] return $jsApi->createOauthUrlForCode();
[*] }
[*]
[*] /**
[*] * 微信jsapi点击支付
[*] * @param $data
[*] * @return
[*] */
[*] public function wxPayJsApi($data) {
[*] $jsApi = new JsApi_handle();
[*] //统一下单接口所需数据
[*] $payData = $this->returnData($data);
[*] //获取code码，用以获取openid
[*] $code = $_GET['code'];
[*] $jsApi->setCode($code);
[*] //通过code获取openid
[*] $openid = $jsApi->getOpenId();
[*]
[*] $unifiedOrderResult = null;
[*] if ($openid != null) {
[*] //取得统一下单接口返回的数据
[*] $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
[*] //获取订单接口状态
[*] $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
[*] if ($returnMessage['resultCode']) {
[*] $jsApi->setPrepayId($retuenMessage['resultField']);
[*] //取得wxjsapi接口所需要的数据
[*] $returnMessage['resultData'] = $jsApi->getParams();
[*] }
[*]
[*] return $returnMessage;
[*] }
[*] }
[*]
[*] /**
[*] * 统一下单接口所需要的数据
[*] * @param $data
[*] * @return
[*] */
[*] public function returnData($data) {
[*] $payData['sn'] = $data['sn'];
[*] $payData['body'] = $data['goods_name'];
[*] $payData['out_trade_no'] = $data['order_no'];
[*] $payData['total_fee'] = $data['fee'];
[*] $payData['attach'] = $data['attach'];
[*]
[*] return $payData;
[*] }
[*]
[*] /**
[*] * 返回统一下单接口结果 （参考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1）
[*] * @param $payData
[*] * @param $trade_type
[*] * @param $openid
[*] * @return
[*] */
[*] public function getResult($payData, $trade_type, $openid = null) {
[*] $unifiedOrder = new UnifiedOrder_handle();
[*]
[*] if ($opneid != null) {
[*] $unifiedOrder->setParam('openid', $openid);
[*] }
[*] $unifiedOrder->setParam('body', $payData['body']); //商品描述
[*] $unifiedOrder->setParam('out_trade_no', $payData['out_trade_no']); //商户订单号
[*] $unifiedOrder->setParam('total_fee', $payData['total_fee']); //总金额
[*] $unifiedOrder->setParam('attach', $payData['attach']); //附加数据
[*] $unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址
[*] $unifiedOrder->setParam('trade_type', $trade_type); //交易类型
[*]
[*] //非必填参数，商户可根据实际情况选填
[*] //$unifiedOrder->setParam("sub_mch_id","XXXX");//子商户号
[*] //$unifiedOrder->setParam("device_info","XXXX");//设备号
[*] //$unifiedOrder->setParam("time_start","XXXX");//交易起始时间
[*] //$unifiedOrder->setParam("time_expire","XXXX");//交易结束时间
[*] //$unifiedOrder->setParam("goods_tag","XXXX");//商品标记
[*] //$unifiedOrder->setParam("product_id","XXXX");//商品ID
[*]
[*] return $unifiedOrder->getResult();
[*] }
[*]
[*] /**
[*] * 返回微信订单状态
[*] */
[*] public function returnMessage($unifiedOrderResult,$field){
[*] $arrMessage=array("resultCode"=>0,"resultType"=>"获取错误","resultMsg"=>"该字段为空");
[*] if($unifiedOrderResult==null){
[*] $arrMessage["resultType"]="未获取权限";
[*] $arrMessage["resultMsg"]="请重新打开页面";
[*] }elseif ($unifiedOrderResult["return_code"] == "FAIL")
[*] {
[*] $arrMessage["resultType"]="网络错误";
[*] $arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];
[*] }
[*] elseif($unifiedOrderResult["result_code"] == "FAIL")
[*] {
[*] $arrMessage["resultType"]="订单错误";
[*] $arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];
[*] }
[*] elseif($unifiedOrderResult[$field] != NULL)
[*] {
[*] $arrMessage["resultCode"]=1;
[*] $arrMessage["resultType"]="生成订单";
[*] $arrMessage["resultMsg"]="OK";
[*] $arrMessage["resultField"] = $unifiedOrderResult[$field];
[*] }
[*] return $arrMessage;
[*] }
[*]
[*] /**
[*] * 微信回调接口返回 验证签名并回应微信
[*] * @param $xml
[*] * @return
[*] */
[*] public function wxPayNotify($xml) {
[*] $notify = new Wxpay_server();
[*] $notify->saveData($xml);
[*] //验证签名，并回复微信
[*] //对后台通知交互时，如果微信收到商户的应答不是成功或者超时，微信认为通知失败
[*] //微信会通过一定的策略（如30分钟共8次），定期重新发起通知
[*] if ($notify->checkSign() == false) {
[*] $notify->setReturnParameter("return_code","FAIL");//返回状态码
[*] $notify->setReturnParameter("return_msg","签名失败");//返回信息
[*] } else {
[*] $notify->checkSign=TRUE;
[*] $notify->setReturnParameter("return_code","SUCCESS");//设置返回码
[*] }
[*]
[*] return $notify;
[*] }
[*]}
[*]
[*]/**
[*]* JSAPI支付——H5网页端调起支付接口
[*]*/
[*]class JsApi_handle extends JsApi_common {
[*] public $code;//code码，用以获取openid
[*] public $openid;//用户的openid
[*] public $parameters;//jsapi参数，格式为json
[*] public $prepay_id;//使用统一支付接口得到的预支付id
[*] public $curl_timeout;//curl超时时间
[*]
[*] function __construct()
[*] {
[*] //设置curl超时时间
[*] $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
[*] }
[*]
[*] /**
[*] * 生成获取code的URL
[*] * @return
[*] */
[*] public function createOauthUrlForCode() {
[*] //重定向URL
[*] $redirectUrl = "http://www.itcen.cn/wxpay/confirm/".$orderId."?showwxpaytitle=1";
[*] $urlParams['appid'] = WxPayConf::APPID;
[*] $urlParams['redirect_uri'] = $redirectUrl;
[*] $urlParams['response_type'] = 'code';
[*] $urlParams['scope'] = 'snsapi_base';
[*] $urlParams['state'] = "STATE"."#wechat_redirect";
[*] //拼接字符串
[*] $queryString = $this->ToUrlParams($urlParams, false);
[*] return "https://open.weixin.qq.com/connect/oauth2/authorize?".$queryString;
[*] }
[*]
[*] /**
[*] * 设置code
[*] * @param $code
[*] */
[*] public function setCode($code) {
[*] $this->code = $code;
[*] }
[*]
[*] /**
[*] * 作用：设置prepay_id
[*] */
[*] public function setPrepayId($prepayId)
[*] {
[*] $this->prepay_id = $prepayId;
[*] }
[*]
[*] /**
[*] * 作用：获取jsapi的参数
[*] */
[*] public function getParams()
[*] {
[*] $jsApiObj["appId"] = WxPayConf::APPID;
[*] $timeStamp = time();
[*] $jsApiObj["timeStamp"] = "$timeStamp";
[*] $jsApiObj["nonceStr"] = $this->createNoncestr();
[*] $jsApiObj["package"] = "prepay_id=$this->prepay_id";
[*] $jsApiObj["signType"] = "MD5";
[*] $jsApiObj["paySign"] = $this->getSign($jsApiObj);
[*] $this->parameters = json_encode($jsApiObj);
[*]
[*] return $this->parameters;
[*] }
[*]
[*] /**
[*] * 通过curl 向微信提交code 用以获取openid
[*] * @return
[*] */
[*] public function getOpenId() {
[*] //创建openid 的链接
[*] $url = $this->createOauthUrlForOpenid();
[*] //初始化
[*] $ch = curl_init();
[*] curl_setopt($ch, CURL_TIMEOUT, $this->curl_timeout);
[*] curl_setopt($ch, CURL_URL, $url);
[*] curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
[*] curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
[*] curl_setopt($ch, CURL_HEADER, FALSE);
[*] curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
[*] //执行curl
[*] $res = curl_exec($ch);
[*] curl_close($ch);
[*] //取出openid
[*] $data = json_decode($res);
[*] if (isset($data['openid'])) {
[*] $this->openid = $data['openid'];
[*] } else {
[*] return null;
[*] }
[*]
[*] return $this->openid;
[*]
[*] }
[*]
[*] /**
[*] * 生成可以获取openid 的URL
[*] * @return
[*] */
[*] public function createOauthUrlForOpenid() {
[*] $urlParams['appid'] = WxPayConf::APPID;
[*] $urlParams['secret'] = WxPayConf::APPSECRET;
[*] $urlParams['code'] = $this->code;
[*] $urlParams['grant_type'] = "authorization_code";
[*] $queryString = $this->ToUrlParams($urlParams, false);
[*] return "https://api.weixin.qq.com/sns/oauth2/access_token?".$queryString;
[*] }
[*]}
[*]
[*]/**
[*] * 统一下单接口类
[*] */
[*]class UnifiedOrder_handle extends Wxpay_client_handle {
[*] public function __construct() {
[*] //设置接口链接
[*] $this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
[*] //设置curl超时时间
[*] $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
[*] }
[*]
[*]}
[*]
[*]/**
[*] * 响应型接口基类
[*] */
[*]class Wxpay_server_handle extends JsApi_common{
[*] public $data; //接收到的数据，类型为关联数组
[*] public $returnParams; //返回参数，类型为关联数组
[*]
[*] /**
[*] * 将微信请求的xml转换成关联数组
[*] * @param $xml
[*] * @return
[*] */
[*] public function saveData($xml) {
[*] $this->data = $this->xmlToArray($xml);
[*] }
[*]
[*]
[*] /**
[*] * 验证签名
[*] * @return
[*] */
[*] public function checkSign() {
[*] $tmpData = $this->data;
[*] unset($temData['sign']);
[*] $sign = $this->getSign($tmpData);
[*] if ($this->data['sign'] == $sign) {
[*] return true;
[*] }
[*] return false;
[*] }
[*]
[*]
[*] /**
[*] * 设置返回微信的xml数据
[*] */
[*] function setReturnParameter($parameter, $parameterValue)
[*] {
[*] $this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);
[*] }
[*]
[*] /**
[*] * 将xml数据返回微信
[*] */
[*] function returnXml()
[*] {
[*] $returnXml = $this->createXml();
[*] return $returnXml;
[*] }
[*]
[*]}
[*]
[*]/**
[*] * 请求型接口的基类
[*] */
[*]class Wxpay_client_handle extends JsApi_common{
[*] public $params; //请求参数，类型为关联数组
[*] public $response; //微信返回的响应
[*] public $result; //返回参数，类型类关联数组
[*] public $url; //接口链接
[*] public $curl_timeout; //curl超时时间
[*]
[*] /**
[*] * 设置请求参数
[*] * @param $param
[*] * @param $paramValue
[*] */
[*] public function setParam($param, $paramValue) {
[*] $this->params[$this->tirmString($param)] = $this->trimString($paramValue);
[*] }
[*]
[*] /**
[*] * 获取结果，默认不使用证书
[*] * @return
[*] */
[*] public function getResult() {
[*] $this->postxml();
[*] $this->result = $this->xmlToArray($this->response);
[*]
[*] return $this->result;
[*] }
[*]
[*] /**
[*] * post请求xml
[*] * @return
[*] */
[*] public function postxml() {
[*] $xml = $this->createXml();
[*] $this->response = $this->postXmlCurl($xml, $this->curl, $this->curl_timeout);
[*]
[*] return $this->response;
[*] }
[*]
[*] public function createXml() {
[*] $this->params['appid'] = WxPayConf::APPID; //公众号ID
[*] $this->params['mch_id'] = WxPayConf::MCHID; //商户号
[*] $this->params['nonce_str'] = $this->createNoncestr(); //随机字符串
[*] $this->params['sign'] = $this->getSign($this->params); //签名
[*]
[*] return $this->arrayToXml($this->params);
[*] }
[*]
[*]
[*]
[*]}
[*]
[*]/**
[*] * 所有接口的基类
[*] */
[*]class JsApi_common {
[*] function __construct() {
[*]
[*] }
[*]
[*] public function trimString($value) {
[*] $ret = null;
[*] if (null != $value) {
[*] $ret = trim($value);
[*] if (strlen($ret) == 0) {
[*] $ret = null;
[*] }
[*] }
[*] return $ret;
[*] }
[*]
[*] /**
[*] * 产生随机字符串，不长于32位
[*] * @param integer $length
[*] * @return
[*] */
[*] public function createNoncestr($length = 32) {
[*] $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
[*] $str = '';
[*] for ($i = 0; $i < $length; $i++) {
[*] $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
[*] }
[*]
[*] return $str;
[*] }
[*]
[*] /**
[*] * 格式化参数 拼接字符串，签名过程需要使用
[*] * @param $urlParams
[*] * @param $needUrlencode
[*] */
[*] public function ToUrlParams($urlParams, $needUrlencode) {
[*] $buff = "";
[*] ksort($urlParams);
[*]
[*] foreach ($urlParams as $k => $v) {
[*] if($needUrlencode) $v = urlencode($v);
[*] $buff .= $k .'='. $v .'&';
[*] }
[*]
[*] $reqString = '';
[*] if (strlen($buff) > 0) {
[*] $reqString = substr($buff, 0, strlen($buff) - 1);
[*] }
[*]
[*] return $reqString;
[*] }
[*]
[*] /**
[*] * 生成签名
[*] * @param $params
[*] * @return
[*] */
[*] public function getSign($obj) {
[*] foreach ($obj as $k => $v) {
[*] $params[$k] = $v;
[*] }
[*] //签名步骤一：按字典序排序参数
[*] ksort($params);
[*] $str = $this->ToUrlParams($params, false);
[*] //签名步骤二：在$str后加入key
[*] $str = $str."$key=".WxPayConf::KEY;
[*] //签名步骤三：md5加密
[*] $str = md5($str);
[*] //签名步骤四：所有字符转为大写
[*] $result = strtoupper($str);
[*]
[*] return $result;
[*] }
[*]
[*] /**
[*] * array转xml
[*] * @param $arr
[*] * @return
[*] */
[*] public function arrayToXml($arr) {
[*] $xml = "<xml>";
[*] foreach ($arr as $k => $v) {
[*] if (is_numeric($val)) {
[*] $xml .= "<".$key.">".$key."</".$key.">";
[*] } else {
[*] $xml .= "<".$key."><!]></".$key.">";
[*] }
[*] }
[*] $xml .= "</xml>";
[*] return $xml;
[*] }
[*]
[*] /**
[*] * 将xml转为array
[*] * @param $xml
[*] * @return
[*] */
[*] public function xmlToArray($xml) {
[*] $arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);
[*]
[*] return $arr;
[*] }
[*]
[*] /**
[*] * 以post方式提交xml到对应的接口
[*] * @param $xml
[*] * @param $url
[*] * @param integer $second
[*] * @return
[*] */
[*] public function postXmlCurl($xml, $url, $second = 30) {
[*] //初始化curl
[*] $ch = curl_init();
[*] //设置超时
[*] curl_setopt($ch, CURL_TIMEOUT, $second);
[*] curl_setopt($ch, CURL_URL, $url);
[*] //这里设置代理，如果有的话
[*] //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
[*] //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
[*] curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
[*] curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
[*] //设置header
[*] curl_setopt($ch, CURL_HEADER, FALSE);
[*] //要求结果为字符串且输出到屏幕上
[*] curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
[*] //以post方式提交
[*] curl_setopt($ch, CURL_POST, TRUE);
[*] curl_setopt($ch, CURL_POSTFIELDS, $xml);
[*] //执行curl
[*] $res = curl_exec($ch);
[*]
[*] if ($res) {
[*] curl_close($ch);
[*] return $res;
[*] } else {
[*] $error = curl_errno($ch);
[*] echo "curl出错，错误码:$error"."<br>";
[*] echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
[*] curl_close($ch);
[*] return false;
[*] }
[*] }
[*]}
[*]
[*]/**
[*] * 配置类
[*] */
[*]class WxPayConf {
[*] //微信公众号身份的唯一标识。
[*] const APPID = 'wx654a22c6423213b7';
[*] //受理商ID，身份标识
[*] const MCHID = '10043241';
[*] const MCHNAME = 'KellyCen的博客';
[*]
[*] //商户支付密钥Key。
[*] const KEY = '0000000000000000000000000000000';
[*] //JSAPI接口中获取openid
[*] const APPSECRET = '000000000000000000000000000';
[*]
[*] //证书路径,注意应该填写绝对路径
[*] const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';
[*] const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';
[*] const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';
[*]
[*] //本例程通过curl使用HTTP POST方法，此处可修改其超时时间，默认为30秒
[*] const CURL_TIMEOUT = 30;
[*]}
[*]
[*]Wxpay_model.php
获取到code的URL后，将其分配到页面去，让用户去点击，用户进行点击后，就会从微信服务器获取到code，然后回调到redirect_uri所指的地址去。
2、获取到code后，会回调到redirect_uri所指向的地址去，这里是到了/Wxpay/confirm/，看看这个confirm方法是打算干嘛的：
[*]/**
[*] * 手机端微信支付，此处是授权获取到code时的回调地址
[*] * @param $orderId 订单编号id
[*] * @return
[*] */
[*] public function confirm($orderId) {
[*] //先确认用户是否登录
[*] $this->ensureLogin();
[*] //通过订单编号获取订单数据
[*] $order = $this->wxpay_model->get($orderId);
[*] //验证订单是否是当前用户
[*] $this->_verifyUser($order);
[*]
[*] //取得支付所需要的订单数据
[*] $orderData = $this->returnOrderData[$orderId];
[*] //取得jsApi所需要的数据
[*] $wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);
[*] //将数据分配到模板去，在js里使用
[*] $this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);
[*] $this->smartyData['order'] = $orderData;
[*] $this->displayView('wxpay/confirm.tpl');
[*]
[*] }
这一步开始去取JSAPI支付接口所需要的数据了，这一步算是最主要的一步，这里还会调用统一下单接口获取到prepay_id，我们跳到
$this->wxpay_model->wxPayJsApi($orderData) 看看：
[*]/**
[*] * 微信jsapi点击支付
[*] * @param $data
[*] * @return
[*] */
[*] public function wxPayJsApi($data) {
[*] $jsApi = new JsApi_handle();
[*] //统一下单接口所需数据
[*] $payData = $this->returnData($data);
[*] //获取code码，用以获取openid
[*] $code = $_GET['code'];
[*] $jsApi->setCode($code);
[*] //通过code获取openid
[*] $openid = $jsApi->getOpenId();
[*]
[*] $unifiedOrderResult = null;
[*] if ($openid != null) {
[*] //取得统一下单接口返回的数据
[*] $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
[*] //获取订单接口状态
[*] $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
[*] if ($returnMessage['resultCode']) {
[*] $jsApi->setPrepayId($retuenMessage['resultField']);
[*] //取得wxjsapi接口所需要的数据
[*] $returnMessage['resultData'] = $jsApi->getParams();
[*] }
[*]
[*] return $returnMessage;
[*] }
[*] }
这里首先是取得下单接口所需要的数据；
接着获取到code码，通过code码获取到openid；
然后调用统一下单接口，取得下单接口的响应数据，即prepay_id；
最后取得微信支付JSAPI所需要的数据。
这就是上面这个方法所要做的事情，取到数据后，会将数据分配到模板里，然后根据官方文档所给的参考格式将其放在js里,如下面的代码：
[*]<!doctype html>
[*]<html>
[*]<head lang="zh-CN">
[*]<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
[*]<!-- Make sure that we can test against real IE8 -->
[*]<meta http-equiv="X-UA-Compatible" content="IE=8" />
[*]<title></title>
[*]</head>
[*]<body>
[*]
[*]<a href="javascript:callpay();" id="btnOrder">点击支付</a>
[*]</body>
[*]<script type="text/javascript">
[*] //将数据付给js变量
[*] var wxJsApiData = {$wxJsApiData};
[*] function onBridgeReady()
[*] {
[*] //格式参考官方文档 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6
[*] WeixinJSBridge.invoke(
[*] 'getBrandWCPayRequest',
[*] $.parseJSON(wxJsApiData.resultData),
[*] function(res){
[*] if(res.err_msg == "get_brand_wcpay_request:ok" ){
[*] window.location.href="/wxpay/paysuccess/"+{$order.sn};
[*] }
[*]
[*] }
[*] );
[*] }
[*] function callpay()
[*] {
[*] if(!wxJsApiData.resultCode){
[*] alert(wxJsApiData.resultType+","+wxJsApiData.resultMsg+"!");
[*] return false;
[*] }
[*] if (typeof WeixinJSBridge == "undefined"){
[*] if( document.addEventListener ){
[*] document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
[*] }else if (document.attachEvent){
[*] document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
[*] document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
[*] }
[*] }else{
[*] onBridgeReady();
[*] }
[*] }
[*]</script>
[*]</html>
3、此时用户只需要点击支付，就可以开始进入支付界面了，接着就是输入密码，确认，最后会提示支付成功，紧接着网站会提供一个支付成功跳转页面。类似微信文档里所提供的图片这样，这里我就直接截取文档里的案例图了：
4、这里还有一步，就是微信支付系统会异步通知网站后台用户的支付结果。在获取统一下单数据时，我们指定了一个通知地址，在model里可以找到
支付成功后，微信支付系统会将支付结果异步发送到此地址上/Wxpay/pay_callback/ ，我们来看一下这个方法
[*]/**
[*] * 支付回调接口
[*] * @return
[*] */
[*] public function pay_callback() {
[*] $postData = '';
[*] if (file_get_contents("php://input")) {
[*] $postData = file_get_contents("php://input");
[*] } else {
[*] return;
[*] }
[*] $payInfo = array();
[*] $notify = $this->wxpay_model->wxPayNotify($postData);
[*]
[*] if ($notify->checkSign == TRUE) {
[*] if ($notify->data['return_code'] == 'FAIL') {
[*] $payInfo['status'] = FALSE;
[*] $payInfo['msg'] = '通信出错';
[*] } elseif ($notify->data['result_code'] == 'FAIL') {
[*] $payInfo['status'] = FALSE;
[*] $payInfo['msg'] = '业务出错';
[*] } else {
[*] $payInfo['status'] = TRUE;
[*] $payInfo['msg'] = '支付成功';
[*] $payInfo['sn']=substr($notify->data['out_trade_no'],8);
[*] $payInfo['order_no'] = $notify->data['out_trade_no'];
[*] $payInfo['platform_no']=$notify->data['transaction_id'];
[*] $payInfo['attach']=$notify->data['attach'];
[*] $payInfo['fee']=$notify->data['cash_fee'];
[*] $payInfo['currency']=$notify->data['fee_type'];
[*] $payInfo['user_sign']=$notify->data['openid'];
[*] }
[*] }
[*] $returnXml = $notify->returnXml();
[*]
[*] echo $returnXml;
[*]
[*] $this->load->library('RedisCache');
[*] if($payInfo['status']){
[*] //这里要记录到日志处理（略）
[*] $this->model->order->onPaySuccess($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo);
[*] $this->redis->RedisCache->set('order:payNo:'.$payInfo['order_no'],'OK',5000);
[*] }else{
[*] //这里要记录到日志处理（略）
[*] $this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '订单支付失败 ['.$payInfo['msg'].']');
[*] }
[*] }
这方法就是对支付是否成功，对网站的支付相关逻辑进行后续处理，例如假如支付失败，就需要记录日志里说明此次交易失败，或者是做某一些逻辑处理，而支付成功又该如何做处理，等等。
这里我们就分析下这个方法 $this->wxpay_model->wxPayNotify($postData); 对异步返回的数据进行安全性校验，例如验证签名，看看model里的这个方法：
[*]/**
[*] * 微信回调接口返回 验证签名并回应微信
[*] * @param $xml
[*] * @return
[*] */
[*] public function wxPayNotify($xml) {
[*] $notify = new Wxpay_server();
[*] $notify->saveData($xml);
[*] //验证签名，并回复微信
[*] //对后台通知交互时，如果微信收到商户的应答不是成功或者超时，微信认为通知失败
[*] //微信会通过一定的策略（如30分钟共8次），定期重新发起通知
[*] if ($notify->checkSign() == false) {
[*] $notify->setReturnParameter("return_code","FAIL");//返回状态码
[*] $notify->setReturnParameter("return_msg","签名失败");//返回信息
[*] } else {
[*] $notify->checkSign=TRUE;
[*] $notify->setReturnParameter("return_code","SUCCESS");//设置返回码
[*] }
[*]
[*] return $notify;
[*] }
如果验证通过，则就开始进行交易成功或者失败时所要做的逻辑处理了，这逻辑处理的代码我就不写了，因为每一个网站的处理方式都不一样，我这里是这样处理的，我把思路写下，方便不懂的朋友可以按着我的思路去完善后续的处理：首先是查看数据库里的订单日志表，看这笔交易之前是否已经交易过了，交易过就不用再更新数据表了，如果没交易过，就会将之前存在redis的订单数据给取出来，再将这些数据插入到订单日志表里，差不多就这样处理。
好了，基于H5的微信支付接口开发详解就讲到这里，如果你认真理清博文里所讲解的思路，自己基本上也可以尝试开发此接口了，同时只要会了这个，你也基本上可以开发二维码支付，刷卡支付等等的支付接口。
这里我附上此次开发中的完整代码供大家阅读：
控制器：Wxpay.php
[*]<?php
[*]defined('BASEPATH') OR exit('No direct script access allowed');
[*]
[*]class Wxpay extends MY_Controller {
[*] public function __construct() {
[*] parent::__construct();
[*] $this->load->model('wxpay_model');
[*] //$this->load->model('wxpay');
[*]
[*] }
[*]
[*] public function index() {
[*] //微信支付
[*] $this->smarty['wxPayUrl'] = $this->wxpay_model->retWxPayUrl();
[*] $this->displayView('wxpay/index.tpl');
[*] }
[*]
[*] /**
[*] * 手机端微信支付，此处是授权获取到code时的回调地址
[*] * @param $orderId 订单编号id
[*] * @return
[*] */
[*] public function confirm($orderId) {
[*] //先确认用户是否登录
[*] $this->ensureLogin();
[*] //通过订单编号获取订单数据
[*] $order = $this->wxpay_model->get($orderId);
[*] //验证订单是否是当前用户
[*] $this->_verifyUser($order);
[*]
[*] //取得支付所需要的订单数据
[*] $orderData = $this->returnOrderData[$orderId];
[*] //取得jsApi所需要的数据
[*] $wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);
[*] //将数据分配到模板去，在js里使用
[*] $this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);
[*] $this->smartyData['order'] = $orderData;
[*] $this->displayView('wxpay/confirm.tpl');
[*]
[*] }
[*] /**
[*] * 支付回调接口
[*] * @return
[*] */
[*] public function pay_callback() {
[*] $postData = '';
[*] if (file_get_contents("php://input")) {
[*] $postData = file_get_contents("php://input");
[*] } else {
[*] return;
[*] }
[*] $payInfo = array();
[*] $notify = $this->wxpay_model->wxPayNotify($postData);
[*]
[*] if ($notify->checkSign == TRUE) {
[*] if ($notify->data['return_code'] == 'FAIL') {
[*] $payInfo['status'] = FALSE;
[*] $payInfo['msg'] = '通信出错';
[*] } elseif ($notify->data['result_code'] == 'FAIL') {
[*] $payInfo['status'] = FALSE;
[*] $payInfo['msg'] = '业务出错';
[*] } else {
[*] $payInfo['status'] = TRUE;
[*] $payInfo['msg'] = '支付成功';
[*] $payInfo['sn']=substr($notify->data['out_trade_no'],8);
[*] $payInfo['order_no'] = $notify->data['out_trade_no'];
[*] $payInfo['platform_no']=$notify->data['transaction_id'];
[*] $payInfo['attach']=$notify->data['attach'];
[*] $payInfo['fee']=$notify->data['cash_fee'];
[*] $payInfo['currency']=$notify->data['fee_type'];
[*] $payInfo['user_sign']=$notify->data['openid'];
[*] }
[*] }
[*] $returnXml = $notify->returnXml();
[*]
[*] echo $returnXml;
[*]
[*] $this->load->library('RedisCache');
[*] if($payInfo['status']){
[*] //这里要记录到日志处理（略）
[*] $this->model->order->onPaySuccess($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo);
[*] $this->redis->RedisCache->set('order:payNo:'.$payInfo['order_no'],'OK',5000);
[*] }else{
[*] //这里要记录到日志处理（略）
[*] $this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '订单支付失败 ['.$payInfo['msg'].']');
[*] }
[*] }
[*]
[*] /**
[*] * 返回支付所需要的数据
[*] * @param $orderId 订单号
[*] * @param string $data 订单数据，当$data数据存在时刷新$orderData缓存，因为订单号不唯一
[*] * @return
[*] */
[*] public function returnOrderData($orderId, $data = '') {
[*] //获取订单数据
[*] $order = $this->wxpay_model->get($orderId);
[*] if (0 === count($order)) return false;
[*] if (emptyempty($data)) {
[*] $this->load->library('RedisCache');
[*] //取得缓存在redis的订单数据
[*] $orderData = $this->rediscache->getJson("order:orderData:".$orderId);
[*] if (emptyempty($orderData)) {
[*] //如果redis里没有，则直接读数据库取
[*] $this->load->model('order_model');
[*] $order = $this->order_model->get($orderId);
[*] if (0 === count($order)) {
[*] return false;
[*] }
[*] $data = $order;
[*] } else {
[*] //如果redis里面有的话，直接返回数据
[*] return $orderData;
[*] }
[*] }
[*]
[*] //支付前缓存所需要的数据
[*] $orderData['id'] = $data['id'];
[*] $orderData['fee'] = $data['fee'];
[*]
[*] //支付平台需要的数据
[*] $orderData['user_id'] = $data['user_id'];
[*] $orderData['sn'] = $data['cn'];
[*] //这是唯一编号
[*] $orderData['order_no'] = substr(md5($data['sn'].$data['fee']), 8, 8).$data['sn'];
[*] $orderData['fee'] = $data['fee'];
[*] $orderData['time'] = $data['time'];
[*] $orderData['goods_name'] = $data['goods_name'];
[*] $orderData['attach'] = $data['attach'];
[*]
[*] //将数据缓存到redis里面
[*] $this->rediscache->set("order:orderData:".$orderId, $orderData, 3600*24);
[*] //做个标识缓存到redis，用以判断该订单是否已经支付了
[*] $this->rediscache->set("order:payNo:".$orderData['order_no'], "NO", 3600*24);
[*]
[*] return $orderData;
[*] }
[*]
[*] private function _verifyUser($order) {
[*] if (emptyempty($order)) show_404();
[*] if (0 === count($order)) show_404();
[*] //判断订单表里的用户id是否是当前登录者的id
[*] if ($order['user_id'] == $this->uid) return;
[*] show_error('只能查看自己的订单');
[*] }
[*]
[*]}
[*]
[*]控制器：Wxpay.php
模型：Wxpay_model.php
[*]<?php
[*]defined('BASEPATH') OR exit('No direct script access allowed');
[*]
[*]class Wxpay_model extends CI_Model {
[*] public function __construct() {
[*] parent::__construct();
[*] }
[*]
[*] /**
[*] * 返回可以获得微信code的URL （用以获取openid）
[*] * @return
[*] */
[*] public function retWxPayUrl() {
[*] $jsApi = new JsApi_handle();
[*] return $jsApi->createOauthUrlForCode();
[*] }
[*]
[*] /**
[*] * 微信jsapi点击支付
[*] * @param $data
[*] * @return
[*] */
[*] public function wxPayJsApi($data) {
[*] $jsApi = new JsApi_handle();
[*] //统一下单接口所需数据
[*] $payData = $this->returnData($data);
[*] //获取code码，用以获取openid
[*] $code = $_GET['code'];
[*] $jsApi->setCode($code);
[*] //通过code获取openid
[*] $openid = $jsApi->getOpenId();
[*]
[*] $unifiedOrderResult = null;
[*] if ($openid != null) {
[*] //取得统一下单接口返回的数据
[*] $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
[*] //获取订单接口状态
[*] $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
[*] if ($returnMessage['resultCode']) {
[*] $jsApi->setPrepayId($retuenMessage['resultField']);
[*] //取得wxjsapi接口所需要的数据
[*] $returnMessage['resultData'] = $jsApi->getParams();
[*] }
[*]
[*] return $returnMessage;
[*] }
[*] }
[*]
[*] /**
[*] * 统一下单接口所需要的数据
[*] * @param $data
[*] * @return
[*] */
[*] public function returnData($data) {
[*] $payData['sn'] = $data['sn'];
[*] $payData['body'] = $data['goods_name'];
[*] $payData['out_trade_no'] = $data['order_no'];
[*] $payData['total_fee'] = $data['fee'];
[*] $payData['attach'] = $data['attach'];
[*]
[*] return $payData;
[*] }
[*]
[*] /**
[*] * 返回统一下单接口结果 （参考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1）
[*] * @param $payData
[*] * @param $trade_type
[*] * @param $openid
[*] * @return
[*] */
[*] public function getResult($payData, $trade_type, $openid = null) {
[*] $unifiedOrder = new UnifiedOrder_handle();
[*]
[*] if ($opneid != null) {
[*] $unifiedOrder->setParam('openid', $openid);
[*] }
[*] $unifiedOrder->setParam('body', $payData['body']); //商品描述
[*] $unifiedOrder->setParam('out_trade_no', $payData['out_trade_no']); //商户订单号
[*] $unifiedOrder->setParam('total_fee', $payData['total_fee']); //总金额
[*] $unifiedOrder->setParam('attach', $payData['attach']); //附加数据
[*] $unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址
[*] $unifiedOrder->setParam('trade_type', $trade_type); //交易类型
[*]
[*] //非必填参数，商户可根据实际情况选填
[*] //$unifiedOrder->setParam("sub_mch_id","XXXX");//子商户号
[*] //$unifiedOrder->setParam("device_info","XXXX");//设备号
[*] //$unifiedOrder->setParam("time_start","XXXX");//交易起始时间
[*] //$unifiedOrder->setParam("time_expire","XXXX");//交易结束时间
[*] //$unifiedOrder->setParam("goods_tag","XXXX");//商品标记
[*] //$unifiedOrder->setParam("product_id","XXXX");//商品ID
[*]
[*] return $unifiedOrder->getResult();
[*] }
[*]
[*] /**
[*] * 返回微信订单状态
[*] */
[*] public function returnMessage($unifiedOrderResult,$field){
[*] $arrMessage=array("resultCode"=>0,"resultType"=>"获取错误","resultMsg"=>"该字段为空");
[*] if($unifiedOrderResult==null){
[*] $arrMessage["resultType"]="未获取权限";
[*] $arrMessage["resultMsg"]="请重新打开页面";
[*] }elseif ($unifiedOrderResult["return_code"] == "FAIL")
[*] {
[*] $arrMessage["resultType"]="网络错误";
[*] $arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];
[*] }
[*] elseif($unifiedOrderResult["result_code"] == "FAIL")
[*] {
[*] $arrMessage["resultType"]="订单错误";
[*] $arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];
[*] }
[*] elseif($unifiedOrderResult[$field] != NULL)
[*] {
[*] $arrMessage["resultCode"]=1;
[*] $arrMessage["resultType"]="生成订单";
[*] $arrMessage["resultMsg"]="OK";
[*] $arrMessage["resultField"] = $unifiedOrderResult[$field];
[*] }
[*] return $arrMessage;
[*] }
[*]
[*] /**
[*] * 微信回调接口返回 验证签名并回应微信
[*] * @param $xml
[*] * @return
[*] */
[*] public function wxPayNotify($xml) {
[*] $notify = new Wxpay_server();
[*] $notify->saveData($xml);
[*] //验证签名，并回复微信
[*] //对后台通知交互时，如果微信收到商户的应答不是成功或者超时，微信认为通知失败
[*] //微信会通过一定的策略（如30分钟共8次），定期重新发起通知
[*] if ($notify->checkSign() == false) {
[*] $notify->setReturnParameter("return_code","FAIL");//返回状态码
[*] $notify->setReturnParameter("return_msg","签名失败");//返回信息
[*] } else {
[*] $notify->checkSign=TRUE;
[*] $notify->setReturnParameter("return_code","SUCCESS");//设置返回码
[*] }
[*]
[*] return $notify;
[*] }
[*]}
[*]
[*]/**
[*]* JSAPI支付——H5网页端调起支付接口
[*]*/
[*]class JsApi_handle extends JsApi_common {
[*] public $code;//code码，用以获取openid
[*] public $openid;//用户的openid
[*] public $parameters;//jsapi参数，格式为json
[*] public $prepay_id;//使用统一支付接口得到的预支付id
[*] public $curl_timeout;//curl超时时间
[*]
[*] function __construct()
[*] {
[*] //设置curl超时时间
[*] $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
[*] }
[*]
[*] /**
[*] * 生成获取code的URL
[*] * @return
[*] */
[*] public function createOauthUrlForCode() {
[*] //重定向URL
[*] $redirectUrl = "http://www.itcen.cn/wxpay/confirm/".$orderId."?showwxpaytitle=1";
[*] $urlParams['appid'] = WxPayConf::APPID;
[*] $urlParams['redirect_uri'] = $redirectUrl;
[*] $urlParams['response_type'] = 'code';
[*] $urlParams['scope'] = 'snsapi_base';
[*] $urlParams['state'] = "STATE"."#wechat_redirect";
[*] //拼接字符串
[*] $queryString = $this->ToUrlParams($urlParams, false);
[*] return "https://open.weixin.qq.com/connect/oauth2/authorize?".$queryString;
[*] }
[*]
[*] /**
[*] * 设置code
[*] * @param $code
[*] */
[*] public function setCode($code) {
[*] $this->code = $code;
[*] }
[*]
[*] /**
[*] * 作用：设置prepay_id
[*] */
[*] public function setPrepayId($prepayId)
[*] {
[*] $this->prepay_id = $prepayId;
[*] }
[*]
[*] /**
[*] * 作用：获取jsapi的参数
[*] */
[*] public function getParams()
[*] {
[*] $jsApiObj["appId"] = WxPayConf::APPID;
[*] $timeStamp = time();
[*] $jsApiObj["timeStamp"] = "$timeStamp";
[*] $jsApiObj["nonceStr"] = $this->createNoncestr();
[*] $jsApiObj["package"] = "prepay_id=$this->prepay_id";
[*] $jsApiObj["signType"] = "MD5";
[*] $jsApiObj["paySign"] = $this->getSign($jsApiObj);
[*] $this->parameters = json_encode($jsApiObj);
[*]
[*] return $this->parameters;
[*] }
[*]
[*] /**
[*] * 通过curl 向微信提交code 用以获取openid
[*] * @return
[*] */
[*] public function getOpenId() {
[*] //创建openid 的链接
[*] $url = $this->createOauthUrlForOpenid();
[*] //初始化
[*] $ch = curl_init();
[*] curl_setopt($ch, CURL_TIMEOUT, $this->curl_timeout);
[*] curl_setopt($ch, CURL_URL, $url);
[*] curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
[*] curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
[*] curl_setopt($ch, CURL_HEADER, FALSE);
[*] curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
[*] //执行curl
[*] $res = curl_exec($ch);
[*] curl_close($ch);
[*] //取出openid
[*] $data = json_decode($res);
[*] if (isset($data['openid'])) {
[*] $this->openid = $data['openid'];
[*] } else {
[*] return null;
[*] }
[*]
[*] return $this->openid;
[*]
[*] }
[*]
[*] /**
[*] * 生成可以获取openid 的URL
[*] * @return
[*] */
[*] public function createOauthUrlForOpenid() {
[*] $urlParams['appid'] = WxPayConf::APPID;
[*] $urlParams['secret'] = WxPayConf::APPSECRET;
[*] $urlParams['code'] = $this->code;
[*] $urlParams['grant_type'] = "authorization_code";
[*] $queryString = $this->ToUrlParams($urlParams, false);
[*] return "https://api.weixin.qq.com/sns/oauth2/access_token?".$queryString;
[*] }
[*]}
[*]
[*]/**
[*] * 统一下单接口类
[*] */
[*]class UnifiedOrder_handle extends Wxpay_client_handle {
[*] public function __construct() {
[*] //设置接口链接
[*] $this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
[*] //设置curl超时时间
[*] $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
[*] }
[*]
[*]}
[*]
[*]/**
[*] * 响应型接口基类
[*] */
[*]class Wxpay_server_handle extends JsApi_common{
[*] public $data; //接收到的数据，类型为关联数组
[*] public $returnParams; //返回参数，类型为关联数组
[*]
[*] /**
[*] * 将微信请求的xml转换成关联数组
[*] * @param $xml
[*] * @return
[*] */
[*] public function saveData($xml) {
[*] $this->data = $this->xmlToArray($xml);
[*] }
[*]
[*]
[*] /**
[*] * 验证签名
[*] * @return
[*] */
[*] public function checkSign() {
[*] $tmpData = $this->data;
[*] unset($temData['sign']);
[*] $sign = $this->getSign($tmpData);
[*] if ($this->data['sign'] == $sign) {
[*] return true;
[*] }
[*] return false;
[*] }
[*]
[*]
[*] /**
[*] * 设置返回微信的xml数据
[*] */
[*] function setReturnParameter($parameter, $parameterValue)
[*] {
[*] $this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);
[*] }
[*]
[*] /**
[*] * 将xml数据返回微信
[*] */
[*] function returnXml()
[*] {
[*] $returnXml = $this->createXml();
[*] return $returnXml;
[*] }
[*]
[*]}
[*]
[*]/**
[*] * 请求型接口的基类
[*] */
[*]class Wxpay_client_handle extends JsApi_common{
[*] public $params; //请求参数，类型为关联数组
[*] public $response; //微信返回的响应
[*] public $result; //返回参数，类型类关联数组
[*] public $url; //接口链接
[*] public $curl_timeout; //curl超时时间
[*]
[*] /**
[*] * 设置请求参数
[*] * @param $param
[*] * @param $paramValue
[*] */
[*] public function setParam($param, $paramValue) {
[*] $this->params[$this->tirmString($param)] = $this->trimString($paramValue);
[*] }
[*]
[*] /**
[*] * 获取结果，默认不使用证书
[*] * @return
[*] */
[*] public function getResult() {
[*] $this->postxml();
[*] $this->result = $this->xmlToArray($this->response);
[*]
[*] return $this->result;
[*] }
[*]
[*] /**
[*] * post请求xml
[*] * @return
[*] */
[*] public function postxml() {
[*] $xml = $this->createXml();
[*] $this->response = $this->postXmlCurl($xml, $this->curl, $this->curl_timeout);
[*]
[*] return $this->response;
[*] }
[*]
[*] public function createXml() {
[*] $this->params['appid'] = WxPayConf::APPID; //公众号ID
[*] $this->params['mch_id'] = WxPayConf::MCHID; //商户号
[*] $this->params['nonce_str'] = $this->createNoncestr(); //随机字符串
[*] $this->params['sign'] = $this->getSign($this->params); //签名
[*]
[*] return $this->arrayToXml($this->params);
[*] }
[*]
[*]
[*]
[*]}
[*]
[*]/**
[*] * 所有接口的基类
[*] */
[*]class JsApi_common {
[*] function __construct() {
[*]
[*] }
[*]
[*] public function trimString($value) {
[*] $ret = null;
[*] if (null != $value) {
[*] $ret = trim($value);
[*] if (strlen($ret) == 0) {
[*] $ret = null;
[*] }
[*] }
[*] return $ret;
[*] }
[*]
[*] /**
[*] * 产生随机字符串，不长于32位
[*] * @param integer $length
[*] * @return
[*] */
[*] public function createNoncestr($length = 32) {
[*] $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
[*] $str = '';
[*] for ($i = 0; $i < $length; $i++) {
[*] $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
[*] }
[*]
[*] return $str;
[*] }
[*]
[*] /**
[*] * 格式化参数 拼接字符串，签名过程需要使用
[*] * @param $urlParams
[*] * @param $needUrlencode
[*] */
[*] public function ToUrlParams($urlParams, $needUrlencode) {
[*] $buff = "";
[*] ksort($urlParams);
[*]
[*] foreach ($urlParams as $k => $v) {
[*] if($needUrlencode) $v = urlencode($v);
[*] $buff .= $k .'='. $v .'&';
[*] }
[*]
[*] $reqString = '';
[*] if (strlen($buff) > 0) {
[*] $reqString = substr($buff, 0, strlen($buff) - 1);
[*] }
[*]
[*] return $reqString;
[*] }
[*]
[*] /**
[*] * 生成签名
[*] * @param $params
[*] * @return
[*] */
[*] public function getSign($obj) {
[*] foreach ($obj as $k => $v) {
[*] $params[$k] = $v;
[*] }
[*] //签名步骤一：按字典序排序参数
[*] ksort($params);
[*] $str = $this->ToUrlParams($params, false);
[*] //签名步骤二：在$str后加入key
[*] $str = $str."$key=".WxPayConf::KEY;
[*] //签名步骤三：md5加密
[*] $str = md5($str);
[*] //签名步骤四：所有字符转为大写
[*] $result = strtoupper($str);
[*]
[*] return $result;
[*] }
[*]
[*] /**
[*] * array转xml
[*] * @param $arr
[*] * @return
[*] */
[*] public function arrayToXml($arr) {
[*] $xml = "<xml>";
[*] foreach ($arr as $k => $v) {
[*] if (is_numeric($val)) {
[*] $xml .= "<".$key.">".$key."</".$key.">";
[*] } else {
[*] $xml .= "<".$key."><!]></".$key.">";
[*] }
[*] }
[*] $xml .= "</xml>";
[*] return $xml;
[*] }
[*]
[*] /**
[*] * 将xml转为array
[*] * @param $xml
[*] * @return
[*] */
[*] public function xmlToArray($xml) {
[*] $arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);
[*]
[*] return $arr;
[*] }
[*]
[*] /**
[*] * 以post方式提交xml到对应的接口
[*] * @param $xml
[*] * @param $url
[*] * @param integer $second
[*] * @return
[*] */
[*] public function postXmlCurl($xml, $url, $second = 30) {
[*] //初始化curl
[*] $ch = curl_init();
[*] //设置超时
[*] curl_setopt($ch, CURL_TIMEOUT, $second);
[*] curl_setopt($ch, CURL_URL, $url);
[*] //这里设置代理，如果有的话
[*] //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
[*] //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
[*] curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
[*] curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
[*] //设置header
[*] curl_setopt($ch, CURL_HEADER, FALSE);
[*] //要求结果为字符串且输出到屏幕上
[*] curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
[*] //以post方式提交
[*] curl_setopt($ch, CURL_POST, TRUE);
[*] curl_setopt($ch, CURL_POSTFIELDS, $xml);
[*] //执行curl
[*] $res = curl_exec($ch);
[*]
[*] if ($res) {
[*] curl_close($ch);
[*] return $res;
[*] } else {
[*] $error = curl_errno($ch);
[*] echo "curl出错，错误码:$error"."<br>";
[*] echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
[*] curl_close($ch);
[*] return false;
[*] }
[*] }
[*]}
[*]
[*]/**
[*] * 配置类
[*] */
[*]class WxPayConf {
[*] //微信公众号身份的唯一标识。
[*] const APPID = 'wx654a22c6423213b7';
[*] //受理商ID，身份标识
[*] const MCHID = '10043241';
[*] const MCHNAME = 'KellyCen的博客';
[*]
[*] //商户支付密钥Key。
[*] const KEY = '0000000000000000000000000000000';
[*] //JSAPI接口中获取openid
[*] const APPSECRET = '000000000000000000000000000';
[*]
[*] //证书路径,注意应该填写绝对路径
[*] const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';
[*] const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';
[*] const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';
[*]
[*] //本例程通过curl使用HTTP POST方法，此处可修改其超时时间，默认为30秒
[*] const CURL_TIMEOUT = 30;
[*]}
[*]
[*]模型：Wxpay_model.php
视图：index.tpl
[*]<!doctype html>
[*]<html>
[*]<head lang="zh-CN">
[*]<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
[*]<!-- Make sure that we can test against real IE8 -->
[*]<meta http-equiv="X-UA-Compatible" content="IE=8" />
[*]<title></title>
[*]</head>
[*]<body>
[*]
[*]<a href="{$wxPayUrl}">微信支付</a>
[*]</body>
[*]</html>
[*]
[*]视图：index.tpl
视图：confirm.tpl
[*]<!doctype html>
[*]<html>
[*]<head lang="zh-CN">
[*]<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
[*]<!-- Make sure that we can test against real IE8 -->
[*]<meta http-equiv="X-UA-Compatible" content="IE=8" />
[*]<title></title>
[*]</head>
[*]<body>
[*]
[*]<a href="javascript:callpay();" id="btnOrder">点击支付</a>
[*]</body>
[*]<script type="text/javascript">
[*] //将数据付给js变量
[*] var wxJsApiData = {$wxJsApiData};
[*] function onBridgeReady()
[*] {
[*] //格式参考官方文档 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6
[*] WeixinJSBridge.invoke(
[*] 'getBrandWCPayRequest',
[*] $.parseJSON(wxJsApiData.resultData),
[*] function(res){
[*] if(res.err_msg == "get_brand_wcpay_request:ok" ){
[*] window.location.href="/wxpay/paysuccess/"+{$order.sn};
[*] }
[*]
[*] }
[*] );
[*] }
[*] function callpay()
[*] {
[*] if(!wxJsApiData.resultCode){
[*] alert(wxJsApiData.resultType+","+wxJsApiData.resultMsg+"!");
[*] return false;
[*] }
[*] if (typeof WeixinJSBridge == "undefined"){
[*] if( document.addEventListener ){
[*] document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
[*] }else if (document.attachEvent){
[*] document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
[*] document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
[*] }
[*] }else{
[*] onBridgeReady();
[*] }
[*] }
[*]</script>
[*]</html>
[*]
[*]视图：confirm.tpl
里面所用到的一些自定义函数可以在我上一篇博文里找找，那里已经提供了代码参考了
现在我们的线上项目是微信支付，支付宝支付，网银支付信用卡支付的功能都有，并且PC和WAP端都分别对应有。所以整一个支付系统模块还算比较完整，后期有时间我会总结和分享下其他的支付接口开发的博文，希望有兴趣的博友可以关注下哦！！
本次分享和总结就到此
如果此博文中有哪里讲得让人难以理解，欢迎留言交流，若有讲解错的地方欢迎指出。
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