***PHP基於H5的微信支付開發詳解(CI框架)

  此次總結一下用戶在微信內打開網頁時,能夠調用微信支付完成下單功能的模塊開發,也就是在微信內的H5頁面經過jsApi接口實現支付功能。固然了,微信官網上的微信支付開發文檔也講解的很詳細,而且有實現代碼可供參考,有的朋友直接看文檔就能夠本身實現此支付接口的開發了。javascript

  1、前言php

  爲什麼我還寫一篇微信支付接口的博文呢?第一,咱們必須知道,所謂的工做經驗不少都是靠總結出來的,你只有總結了更多知識,積累了更多經驗,你才能在該行業中脫穎而出,我我的以爲現在的招聘,不少都須要工做經驗(1年、3年、5年....),其實,工做時間的長久不能衡量一我的技術水平的高低,有的人一年的工做經驗能拿3年工做經驗的程序猿的工資,有的3年工做經驗的卻有可能比別人只有一年工做經驗的還低,因此說,總結才能讓本身的知識體系,經驗深度更牛逼更穩固(雖然寫一篇博文挺花費時間的);第二,寫博文分享給你們仍是挺有成就感的,首先是能讓新手從我分享的博文中能學到東西,而且能快速將博文所講解的技術運用到實際中來,因此我寫的博文基本上能讓新人快速讀懂而且容易理解,另外,技術大神的話,看到博文有講解的不對之處,還能夠指出,而且能夠交流,何樂而不爲呢,咱們須要的就是分享和交流。html

  扯遠了,直接進入該主題的詳解。java

  如今的微信支付方式有N種,看下圖,有刷卡支付、公衆號支付、掃碼支付和APP支付,另外還有支付工具的開發,本博文選擇的是公衆號支付藉口而開發進行講解,其餘幾種支付接口開發基本上思路都是同樣的,只要你能看懂我這博文所講解的基本思路,你基本上也能獨自開發其餘幾個支付接口。redis

  2、思路詳解數據庫

  咱們能夠拿微信支付接口文檔裏的業務流程時序圖看看,以下圖,基本思路是這樣子:首先在後臺生成一個連接,展現給用戶讓用戶點擊(例如頁面上有微信支付的按鈕),用戶點擊按鈕後,網站後臺會根據訂單的相關信息生成一個支付訂單,此時會調用統一下單接口,對微信支付系統發起請求,而微信支付系統受到請求後,會根據請求過來的數據,生成一個 預支付交易會話標識(prepay_id,就是經過這個來識別該訂單的),咱們的網站收到微信支付系統的響應後,會獲得prepay_id,而後經過本身構造微信支付所須要的參數,接着將支付所需參數返回給客戶端,用戶此時可能會有一個訂單信息頁,會有一個按鈕,點擊支付,此時會調用JSAPI接口對微信支付系統發起 請求支付,微信支付系統檢查了請求的相關合法性以後,就會提示輸入密碼,用戶此時輸入密碼確認,微信支付系統會對其進行驗證,經過的話會返回支付結果,而後微信跳轉會H5頁面,這其中有一步是異步通知網站支付結果,咱們網站須要對此進行處理(好比說異步支付結果經過後,須要更新數據表或者訂單信息,例如標誌用戶已支付該訂單了,同時也須要更新訂單日誌,防止用戶重複提交訂單)。json

  3、代碼講解api

  本次開發環境用的是php5.6 + MySQL + Redis + Linux + Apache,所選用的框架的CI框架(這些環境不必定須要和個人一致,框架也能夠本身選擇,反正本身稍微修改下代碼就能移植過去了)。數組

  微信支付接口的開發代碼我已經提早寫好了,在這裏我對其進行分析講解,方便你們能輕鬆理解,固然,假如你有必定的基礎,直接看代碼就能理清全部流程了,而且個人代碼基本上都寫上了註釋(對於新手來講,這一點比微信文檔所提供的代碼好一點)。緩存

  一、構造一個連接展現給用戶

  這裏咱們提早須要知道一個點,那就是請求統一下單接口須要微信用戶的openid(詳情可看這https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1),而獲取openid須要先獲取code(詳情可看這微信登陸接口),因此咱們須要構造一個獲取code的URL:

複製代碼
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'); } }
複製代碼

  在這先看看model裏所寫的幾個類:model裏有幾個類:微信支付類、統一下單接口類、響應型接口基類、請求型接口基類、全部接口基類、配置類。爲什麼要分那麼多類而不在一個類裏實現全部的方法的,由於,這樣看起來代碼邏輯清晰,哪一個類該幹嗎就幹嗎。

  這裏我直接附上model的代碼了,裏面基本上每個類每個方法甚至每一行代碼都會有解釋的了,這裏我就不對其展開一句句分析了:

  

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Wxpay_model extends CI_Model {
    public function __construct() {
        parent::__construct();
    }
    
    /**
     * 返回能夠得到微信code的URL (用以獲取openid)
     * @return [type] [description]
     */
    public function retWxPayUrl() {
        $jsApi = new JsApi_handle();
        return $jsApi->createOauthUrlForCode();
    }
 
    /**
     * 微信jsapi點擊支付
     * @param  [type] $data [description]
     * @return [type]       [description]
     */
    public function wxPayJsApi($data) {
        $jsApi = new JsApi_handle();
        //統一下單接口所需數據
        $payData = $this->returnData($data);
        //獲取code碼,用以獲取openid
        $code = $_GET['code'];
        $jsApi->setCode($code);
        //經過code獲取openid
        $openid = $jsApi->getOpenId();
        
        $unifiedOrderResult = null;
        if ($openid != null) {
            //取得統一下單接口返回的數據
            $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
            //獲取訂單接口狀態
            $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
            if ($returnMessage['resultCode']) {
                $jsApi->setPrepayId($retuenMessage['resultField']);
                //取得wxjsapi接口所須要的數據
                $returnMessage['resultData'] = $jsApi->getParams();
            } 

            return $returnMessage;
        }
    }

    /**
     * 統一下單接口所須要的數據
     * @param  [type] $data [description]
     * @return [type]       [description]
     */
    public function returnData($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;
    }

    /**
     * 返回統一下單接口結果 (參考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
     * @param  [type] $payData    [description]
     * @param  [type] $trade_type [description]
     * @param  [type] $openid     [description]
     * @return [type]             [description]
     */
    public function getResult($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']); //商戶訂單號
        $unifiedOrder->setParam('total_fee', $payData['total_fee']);    //總金額
        $unifiedOrder->setParam('attach', $payData['attach']);  //附加數據
        $unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址
        $unifiedOrder->setParam('trade_type', $trade_type); //交易類型

        //非必填參數,商戶可根據實際狀況選填
        //$unifiedOrder->setParam("sub_mch_id","XXXX");//子商戶號
        //$unifiedOrder->setParam("device_info","XXXX");//設備號
        //$unifiedOrder->setParam("time_start","XXXX");//交易起始時間
        //$unifiedOrder->setParam("time_expire","XXXX");//交易結束時間
        //$unifiedOrder->setParam("goods_tag","XXXX");//商品標記
        //$unifiedOrder->setParam("product_id","XXXX");//商品ID
        
        return $unifiedOrder->getResult();
    }

    /**
     * 返回微信訂單狀態
     */
    public function returnMessage($unifiedOrderResult,$field){
        $arrMessage=array("resultCode"=>0,"resultType"=>"獲取錯誤","resultMsg"=>"該字段爲空");
        if($unifiedOrderResult==null){
            $arrMessage["resultType"]="未獲取權限";
            $arrMessage["resultMsg"]="請從新打開頁面";
        }elseif ($unifiedOrderResult["return_code"] == "FAIL")
        {
            $arrMessage["resultType"]="網絡錯誤";
            $arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];
        }
        elseif($unifiedOrderResult["result_code"] == "FAIL")
        {
            $arrMessage["resultType"]="訂單錯誤";
            $arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];
        }
        elseif($unifiedOrderResult[$field] != NULL)
        {
            $arrMessage["resultCode"]=1;
            $arrMessage["resultType"]="生成訂單";
            $arrMessage["resultMsg"]="OK";
            $arrMessage["resultField"] = $unifiedOrderResult[$field];
        }
        return $arrMessage;
    }

    /**
     * 微信回調接口返回  驗證簽名並回應微信
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function wxPayNotify($xml) {
        $notify = new Wxpay_server();
        $notify->saveData($xml);
        //驗證簽名,並回復微信
        //對後臺通知交互時,若是微信收到商戶的應答不是成功或者超時,微信認爲通知失敗
        //微信會經過必定的策略(如30分鐘共8次),按期從新發起通知
        if ($notify->checkSign() == false) {
            $notify->setReturnParameter("return_code","FAIL");//返回狀態碼
            $notify->setReturnParameter("return_msg","簽名失敗");//返回信息
        } else {
            $notify->checkSign=TRUE;
            $notify->setReturnParameter("return_code","SUCCESS");//設置返回碼
        }

        return $notify;
    }
}

/**
* JSAPI支付——H5網頁端調起支付接口
*/
class JsApi_handle extends JsApi_common {
    public $code;//code碼,用以獲取openid
    public $openid;//用戶的openid
    public $parameters;//jsapi參數,格式爲json
    public $prepay_id;//使用統一支付接口獲得的預支付id
    public $curl_timeout;//curl超時時間

    function __construct()
    {
        //設置curl超時時間
        $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
    }

    /**
     * 生成獲取code的URL
     * @return [type] [description]
     */
    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;
    }

    /**
     * 設置code
     * @param [type] $code [description]
     */
    public function setCode($code) {
        $this->code = $code;
    }

    /**
     *  做用:設置prepay_id
     */
    public function setPrepayId($prepayId)
    {
        $this->prepay_id = $prepayId;
    }

    /**
     *  做用:獲取jsapi的參數
     */
    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;
    }

    /**
     * 經過curl 向微信提交code 用以獲取openid
     * @return [type] [description]
     */
    public function getOpenId() {
        //建立openid 的連接
        $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);
        //執行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;

    }

    /**
     * 生成能夠獲取openid 的URL
     * @return [type] [description]
     */
    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;
    }
}

/**
 * 統一下單接口類
 */
class UnifiedOrder_handle extends Wxpay_client_handle {
    public function __construct() {
        //設置接口連接
        $this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        //設置curl超時時間
        $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
    }

}

/**
 * 響應型接口基類
 */
class Wxpay_server_handle extends JsApi_common{
    public $data; //接收到的數據,類型爲關聯數組
    public $returnParams;   //返回參數,類型爲關聯數組

    /**
     * 將微信請求的xml轉換成關聯數組
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function saveData($xml) {
        $this->data = $this->xmlToArray($xml); 
    }


    /**
     * 驗證簽名
     * @return [type] [description]
     */
    public function checkSign() {
        $tmpData = $this->data;
        unset($temData['sign']);
        $sign = $this->getSign($tmpData);
        if ($this->data['sign'] == $sign) {
            return true;
        }
        return false;
    }


    /**
     * 設置返回微信的xml數據
     */
    function setReturnParameter($parameter, $parameterValue)
    {
        $this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);
    }

    /**
     * 將xml數據返回微信
     */
    function returnXml()
    {
        $returnXml = $this->createXml();
        return $returnXml;
    }

}

/**
 * 請求型接口的基類
 */
class Wxpay_client_handle extends JsApi_common{
    public $params; //請求參數,類型爲關聯數組
    public $response; //微信返回的響應
    public $result; //返回參數,類型類關聯數組
    public $url; //接口連接
    public $curl_timeout; //curl超時時間

    /**
     * 設置請求參數
     * @param [type] $param      [description]
     * @param [type] $paramValue [description]
     */
    public function setParam($param, $paramValue) {
        $this->params[$this->tirmString($param)] = $this->trimString($paramValue);
    }

    /**
     * 獲取結果,默認不使用證書
     * @return [type] [description]
     */
    public function getResult() {
        $this->postxml(); 
        $this->result = $this->xmlToArray($this->response);

        return $this->result;
    }

    /**
     * post請求xml
     * @return [type] [description]
     */
    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; //公衆號ID
        $this->params['mch_id'] = WxPayConf::MCHID; //商戶號
        $this->params['nonce_str'] = $this->createNoncestr();   //隨機字符串
        $this->params['sign'] = $this->getSign($this->params);  //簽名
        
        return $this->arrayToXml($this->params); 
    }

    

}

/**
 * 全部接口的基類
 */
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;
    }

    /**
     * 產生隨機字符串,不長於32位
     * @param  integer $length [description]
     * @return [type]          [description]
     */
    public function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }

        return $str;
    }

    /**
     * 格式化參數 拼接字符串,簽名過程須要使用
     * @param [type] $urlParams     [description]
     * @param [type] $needUrlencode [description]
     */
    public function ToUrlParams($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;
    }

    /**
     * 生成簽名
     * @param  [type] $params [description]
     * @return [type]         [description]
     */
    public function getSign($obj) {
        foreach ($obj as $k => $v) {
            $params[$k] = $v;
        }
        //簽名步驟一:按字典序排序參數
        ksort($params);
        $str = $this->ToUrlParams($params, false);  
        //簽名步驟二:在$str後加入key
        $str = $str."$key=".WxPayConf::KEY;
        //簽名步驟三:md5加密
        $str = md5($str);
        //簽名步驟四:全部字符轉爲大寫
        $result = strtoupper($str);

        return $result;
    }

    /**
     * array轉xml
     * @param  [type] $arr [description]
     * @return [type]      [description]
     */
    public function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $k => $v) {
            if (is_numeric($val)) {
                $xml .= "<".$key.">".$key."</".$key.">";
            } else {
                $xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    /**
     * 將xml轉爲array
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function xmlToArray($xml) {
        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);

        return $arr;
    }

    /**
     * 以post方式提交xml到對應的接口
     * @param  [type]  $xml    [description]
     * @param  [type]  $url    [description]
     * @param  integer $second [description]
     * @return [type]          [description]
     */
    public function postXmlCurl($xml, $url, $second = 30) {
        //初始化curl
        $ch = curl_init();
        //設置超時
        curl_setopt($ch, CURL_TIMEOUT, $second);
        curl_setopt($ch, CURL_URL, $url);
        //這裏設置代理,若是有的話
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
        //設置header
        curl_setopt($ch, CURL_HEADER, FALSE);
        //要求結果爲字符串且輸出到屏幕上
        curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
        //以post方式提交
        curl_setopt($ch, CURL_POST, TRUE);
        curl_setopt($ch, CURL_POSTFIELDS, $xml);
        //執行curl
        $res = curl_exec($ch);

        if ($res) {
            curl_close($ch);
            return $res;
        } else {
            $error = curl_errno($ch);
            echo "curl出錯,錯誤碼:$error"."<br>";
            echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>錯誤緣由查詢</a></br>";
            curl_close($ch);
            return false;
        }
    }
}

/**
 * 配置類
 */
class WxPayConf {
    //微信公衆號身份的惟一標識。
    const APPID = 'wx654a22c6423213b7';
    //受理商ID,身份標識
    const MCHID = '10043241';
    const MCHNAME = 'KellyCen的博客';
    
    //商戶支付密鑰Key。
    const KEY = '0000000000000000000000000000000';
    //JSAPI接口中獲取openid
    const APPSECRET = '000000000000000000000000000';

    //證書路徑,注意應該填寫絕對路徑
    const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';
    const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';
    const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';

    //本例程經過curl使用HTTP POST方法,此處可修改其超時時間,默認爲30秒
    const CURL_TIMEOUT = 30;
}

Wxpay_model.php
Wxpay_model.php

 

  獲取到code的URL後,將其分配到頁面去,讓用戶去點擊,用戶進行點擊後,就會從微信服務器獲取到code,而後回調到redirect_uri所指的地址去。

  二、獲取到code後,會回調到redirect_uri所指向的地址去,這裏是到了/Wxpay/confirm/,看看這個confirm方法是打算幹嗎的

複製代碼
   /**
     * 手機端微信支付,此處是受權獲取到code時的回調地址
     * @param  [type] $orderId 訂單編號id
     * @return [type]          [description]
     */ 
    public function confirm($orderId) {
        //先確認用戶是否登陸
        $this->ensureLogin();
        //經過訂單編號獲取訂單數據
        $order = $this->wxpay_model->get($orderId);
        //驗證訂單是不是當前用戶
        $this->_verifyUser($order);

        //取得支付所須要的訂單數據
        $orderData = $this->returnOrderData[$orderId];
        //取得jsApi所須要的數據
        $wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);
        //將數據分配到模板去,在js裏使用
        $this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);
        $this->smartyData['order'] = $orderData;
        $this->displayView('wxpay/confirm.tpl');
        
    }
複製代碼

  這一步開始去取JSAPI支付接口所須要的數據了,這一步算是最主要的一步,這裏還會調用統一下單接口獲取到prepay_id,咱們跳到

  $this->wxpay_model->wxPayJsApi($orderData) 看看:

複製代碼
/**
     * 微信jsapi點擊支付
     * @param  [type] $data [description]
     * @return [type]       [description]
     */
    public function wxPayJsApi($data) {
        $jsApi = new JsApi_handle();
        //統一下單接口所需數據
        $payData = $this->returnData($data);
        //獲取code碼,用以獲取openid
        $code = $_GET['code'];
        $jsApi->setCode($code);
        //經過code獲取openid
        $openid = $jsApi->getOpenId();
        
        $unifiedOrderResult = null;
        if ($openid != null) {
            //取得統一下單接口返回的數據
            $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
            //獲取訂單接口狀態
            $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
            if ($returnMessage['resultCode']) {
                $jsApi->setPrepayId($retuenMessage['resultField']);
                //取得wxjsapi接口所須要的數據
                $returnMessage['resultData'] = $jsApi->getParams();
            } 

            return $returnMessage;
        }
    }
複製代碼

  這裏首先是取得下單接口所須要的數據;

  接着獲取到code碼,經過code碼獲取到openid;

  而後調用統一下單接口,取得下單接口的響應數據,即prepay_id;

  最後取得微信支付JSAPI所須要的數據。

  這就是上面這個方法所要作的事情,取到數據後,會將數據分配到模板裏,而後根據官方文檔所給的參考格式將其放在js裏,以下面的代碼:

複製代碼
<!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">點擊支付</a>
</body>  
<script type="text/javascript">
    //將數據付給js變量
    var wxJsApiData = {$wxJsApiData};
    function onBridgeReady()
        {
            //格式參考官方文檔 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>
複製代碼

  三、此時用戶只須要點擊支付,就能夠開始進入支付界面了,接着就是輸入密碼,確認,最後會提示支付成功,緊接着網站會提供一個支付成功跳轉頁面。相似微信文檔裏所提供的圖片這樣,這裏我就直接截取文檔裏的案例圖了:

  四、這裏還有一步,就是微信支付系統會異步通知網站後臺用戶的支付結果。在獲取統一下單數據時,咱們指定了一個通知地址,在model裏能夠找到

  支付成功後,微信支付系統會將支付結果異步發送到此地址上/Wxpay/pay_callback/ ,咱們來看一下這個方法

複製代碼
/**
     * 支付回調接口
     * @return [type] [description]
     */
    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;
                $payInfo['msg'] = '通訊出錯';
            } elseif ($notify->data['result_code'] == 'FAIL') {
                $payInfo['status'] = FALSE;
                $payInfo['msg'] = '業務出錯';
            } 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']){
           //這裏要記錄到日誌處理(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{
           //這裏要記錄到日誌處理(略)
            $this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '訂單支付失敗 ['.$payInfo['msg'].']');
        }
    }
複製代碼

  這方法就是對支付是否成功,對網站的支付相關邏輯進行後續處理,例如假如支付失敗,就須要記錄日誌裏說明這次交易失敗,或者是作某一些邏輯處理,而支付成功又該如何作處理,等等。

  這裏咱們就分析下這個方法 $this->wxpay_model->wxPayNotify($postData); 對異步返回的數據進行安全性校驗,例如驗證簽名,看看model裏的這個方法:

複製代碼
    /**
     * 微信回調接口返回  驗證簽名並回應微信
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function wxPayNotify($xml) {
        $notify = new Wxpay_server();
        $notify->saveData($xml);
        //驗證簽名,並回復微信
        //對後臺通知交互時,若是微信收到商戶的應答不是成功或者超時,微信認爲通知失敗
        //微信會經過必定的策略(如30分鐘共8次),按期從新發起通知
        if ($notify->checkSign() == false) {
            $notify->setReturnParameter("return_code","FAIL");//返回狀態碼
            $notify->setReturnParameter("return_msg","簽名失敗");//返回信息
        } else {
            $notify->checkSign=TRUE;
            $notify->setReturnParameter("return_code","SUCCESS");//設置返回碼
        }

        return $notify;
    }
複製代碼

  若是驗證經過,則就開始進行交易成功或者失敗時所要作的邏輯處理了,這邏輯處理的代碼我就不寫了,由於每個網站的處理方式都不同,我這裏是這樣處理的,我把思路寫下,方便不懂的朋友能夠按着個人思路去完善後續的處理:首先是查看數據庫裏的訂單日誌表,看這筆交易以前是否已經交易過了,交易過就不用再更新數據表了,若是沒交易過,就會將以前存在redis的訂單數據給取出來,再將這些數據插入到訂單日誌表裏,差很少就這樣處理。

 

  好了,基於H5的微信支付接口開發詳解就講到這裏,若是你認真理清博文裏所講解的思路,本身基本上也能夠嘗試開發此接口了,同時只要會了這個,你也基本上能夠開發二維碼支付,刷卡支付等等的支付接口。

     這裏我附上這次開發中的完整代碼供你們閱讀:

<?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');
    }

    /**
     * 手機端微信支付,此處是受權獲取到code時的回調地址
     * @param  [type] $orderId 訂單編號id
     * @return [type]          [description]
     */ 
    public function confirm($orderId) {
        //先確認用戶是否登陸
        $this->ensureLogin();
        //經過訂單編號獲取訂單數據
        $order = $this->wxpay_model->get($orderId);
        //驗證訂單是不是當前用戶
        $this->_verifyUser($order);

        //取得支付所須要的訂單數據
        $orderData = $this->returnOrderData[$orderId];
        //取得jsApi所須要的數據
        $wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);
        //將數據分配到模板去,在js裏使用
        $this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);
        $this->smartyData['order'] = $orderData;
        $this->displayView('wxpay/confirm.tpl');
        
    }
    /**
     * 支付回調接口
     * @return [type] [description]
     */
    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;
                $payInfo['msg'] = '通訊出錯';
            } elseif ($notify->data['result_code'] == 'FAIL') {
                $payInfo['status'] = FALSE;
                $payInfo['msg'] = '業務出錯';
            } 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']){
           //這裏要記錄到日誌處理(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{
           //這裏要記錄到日誌處理(略)
            $this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '訂單支付失敗 ['.$payInfo['msg'].']');
        }
    }

    /**
     * 返回支付所須要的數據
     * @param  [type] $orderId 訂單號
     * @param  string $data    訂單數據,當$data數據存在時刷新$orderData緩存,由於訂單號不惟一
     * @return [type]          [description]
     */
    public function returnOrderData($orderId, $data = '') {
        //獲取訂單數據
        $order = $this->wxpay_model->get($orderId);
        if (0 === count($order)) return false;
        if (empty($data)) {
            $this->load->library('RedisCache');
            //取得緩存在redis的訂單數據
            $orderData = $this->rediscache->getJson("order:orderData:".$orderId);
            if (empty($orderData)) {
                //若是redis裏沒有,則直接讀數據庫取
                $this->load->model('order_model');
                $order = $this->order_model->get($orderId);
                if (0 === count($order)) {
                    return false;
                }
                $data = $order;
            } else {
                //若是redis裏面有的話,直接返回數據
                return $orderData;
            }
        }
 
        //支付前緩存所須要的數據
        $orderData['id'] = $data['id'];
        $orderData['fee'] = $data['fee'];

        //支付平臺須要的數據
        $orderData['user_id'] = $data['user_id'];
        $orderData['sn'] = $data['cn'];
        //這是惟一編號
        $orderData['order_no'] = substr(md5($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'];

        //將數據緩存到redis裏面
        $this->rediscache->set("order:orderData:".$orderId, $orderData, 3600*24);
        //作個標識緩存到redis,用以判斷該訂單是否已經支付了
        $this->rediscache->set("order:payNo:".$orderData['order_no'], "NO", 3600*24);

        return $orderData;
    }

    private function _verifyUser($order) {
        if (empty($order)) show_404();
        if (0 === count($order)) show_404();
        //判斷訂單表裏的用戶id是不是當前登陸者的id
        if ($order['user_id'] == $this->uid) return;
        show_error('只能查看本身的訂單');
    }

}

控制器:Wxpay.php
控制器:Wxpay.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Wxpay_model extends CI_Model {
    public function __construct() {
        parent::__construct();
    }
    
    /**
     * 返回能夠得到微信code的URL (用以獲取openid)
     * @return [type] [description]
     */
    public function retWxPayUrl() {
        $jsApi = new JsApi_handle();
        return $jsApi->createOauthUrlForCode();
    }
 
    /**
     * 微信jsapi點擊支付
     * @param  [type] $data [description]
     * @return [type]       [description]
     */
    public function wxPayJsApi($data) {
        $jsApi = new JsApi_handle();
        //統一下單接口所需數據
        $payData = $this->returnData($data);
        //獲取code碼,用以獲取openid
        $code = $_GET['code'];
        $jsApi->setCode($code);
        //經過code獲取openid
        $openid = $jsApi->getOpenId();
        
        $unifiedOrderResult = null;
        if ($openid != null) {
            //取得統一下單接口返回的數據
            $unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);
            //獲取訂單接口狀態
            $returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');
            if ($returnMessage['resultCode']) {
                $jsApi->setPrepayId($retuenMessage['resultField']);
                //取得wxjsapi接口所須要的數據
                $returnMessage['resultData'] = $jsApi->getParams();
            } 

            return $returnMessage;
        }
    }

    /**
     * 統一下單接口所須要的數據
     * @param  [type] $data [description]
     * @return [type]       [description]
     */
    public function returnData($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;
    }

    /**
     * 返回統一下單接口結果 (參考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
     * @param  [type] $payData    [description]
     * @param  [type] $trade_type [description]
     * @param  [type] $openid     [description]
     * @return [type]             [description]
     */
    public function getResult($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']); //商戶訂單號
        $unifiedOrder->setParam('total_fee', $payData['total_fee']);    //總金額
        $unifiedOrder->setParam('attach', $payData['attach']);  //附加數據
        $unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址
        $unifiedOrder->setParam('trade_type', $trade_type); //交易類型

        //非必填參數,商戶可根據實際狀況選填
        //$unifiedOrder->setParam("sub_mch_id","XXXX");//子商戶號
        //$unifiedOrder->setParam("device_info","XXXX");//設備號
        //$unifiedOrder->setParam("time_start","XXXX");//交易起始時間
        //$unifiedOrder->setParam("time_expire","XXXX");//交易結束時間
        //$unifiedOrder->setParam("goods_tag","XXXX");//商品標記
        //$unifiedOrder->setParam("product_id","XXXX");//商品ID
        
        return $unifiedOrder->getResult();
    }

    /**
     * 返回微信訂單狀態
     */
    public function returnMessage($unifiedOrderResult,$field){
        $arrMessage=array("resultCode"=>0,"resultType"=>"獲取錯誤","resultMsg"=>"該字段爲空");
        if($unifiedOrderResult==null){
            $arrMessage["resultType"]="未獲取權限";
            $arrMessage["resultMsg"]="請從新打開頁面";
        }elseif ($unifiedOrderResult["return_code"] == "FAIL")
        {
            $arrMessage["resultType"]="網絡錯誤";
            $arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];
        }
        elseif($unifiedOrderResult["result_code"] == "FAIL")
        {
            $arrMessage["resultType"]="訂單錯誤";
            $arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];
        }
        elseif($unifiedOrderResult[$field] != NULL)
        {
            $arrMessage["resultCode"]=1;
            $arrMessage["resultType"]="生成訂單";
            $arrMessage["resultMsg"]="OK";
            $arrMessage["resultField"] = $unifiedOrderResult[$field];
        }
        return $arrMessage;
    }

    /**
     * 微信回調接口返回  驗證簽名並回應微信
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function wxPayNotify($xml) {
        $notify = new Wxpay_server();
        $notify->saveData($xml);
        //驗證簽名,並回復微信
        //對後臺通知交互時,若是微信收到商戶的應答不是成功或者超時,微信認爲通知失敗
        //微信會經過必定的策略(如30分鐘共8次),按期從新發起通知
        if ($notify->checkSign() == false) {
            $notify->setReturnParameter("return_code","FAIL");//返回狀態碼
            $notify->setReturnParameter("return_msg","簽名失敗");//返回信息
        } else {
            $notify->checkSign=TRUE;
            $notify->setReturnParameter("return_code","SUCCESS");//設置返回碼
        }

        return $notify;
    }
}

/**
* JSAPI支付——H5網頁端調起支付接口
*/
class JsApi_handle extends JsApi_common {
    public $code;//code碼,用以獲取openid
    public $openid;//用戶的openid
    public $parameters;//jsapi參數,格式爲json
    public $prepay_id;//使用統一支付接口獲得的預支付id
    public $curl_timeout;//curl超時時間

    function __construct()
    {
        //設置curl超時時間
        $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
    }

    /**
     * 生成獲取code的URL
     * @return [type] [description]
     */
    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;
    }

    /**
     * 設置code
     * @param [type] $code [description]
     */
    public function setCode($code) {
        $this->code = $code;
    }

    /**
     *  做用:設置prepay_id
     */
    public function setPrepayId($prepayId)
    {
        $this->prepay_id = $prepayId;
    }

    /**
     *  做用:獲取jsapi的參數
     */
    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;
    }

    /**
     * 經過curl 向微信提交code 用以獲取openid
     * @return [type] [description]
     */
    public function getOpenId() {
        //建立openid 的連接
        $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);
        //執行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;

    }

    /**
     * 生成能夠獲取openid 的URL
     * @return [type] [description]
     */
    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;
    }
}

/**
 * 統一下單接口類
 */
class UnifiedOrder_handle extends Wxpay_client_handle {
    public function __construct() {
        //設置接口連接
        $this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        //設置curl超時時間
        $this->curl_timeout = WxPayConf::CURL_TIMEOUT;
    }

}

/**
 * 響應型接口基類
 */
class Wxpay_server_handle extends JsApi_common{
    public $data; //接收到的數據,類型爲關聯數組
    public $returnParams;   //返回參數,類型爲關聯數組

    /**
     * 將微信請求的xml轉換成關聯數組
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function saveData($xml) {
        $this->data = $this->xmlToArray($xml); 
    }


    /**
     * 驗證簽名
     * @return [type] [description]
     */
    public function checkSign() {
        $tmpData = $this->data;
        unset($temData['sign']);
        $sign = $this->getSign($tmpData);
        if ($this->data['sign'] == $sign) {
            return true;
        }
        return false;
    }


    /**
     * 設置返回微信的xml數據
     */
    function setReturnParameter($parameter, $parameterValue)
    {
        $this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);
    }

    /**
     * 將xml數據返回微信
     */
    function returnXml()
    {
        $returnXml = $this->createXml();
        return $returnXml;
    }

}

/**
 * 請求型接口的基類
 */
class Wxpay_client_handle extends JsApi_common{
    public $params; //請求參數,類型爲關聯數組
    public $response; //微信返回的響應
    public $result; //返回參數,類型類關聯數組
    public $url; //接口連接
    public $curl_timeout; //curl超時時間

    /**
     * 設置請求參數
     * @param [type] $param      [description]
     * @param [type] $paramValue [description]
     */
    public function setParam($param, $paramValue) {
        $this->params[$this->tirmString($param)] = $this->trimString($paramValue);
    }

    /**
     * 獲取結果,默認不使用證書
     * @return [type] [description]
     */
    public function getResult() {
        $this->postxml(); 
        $this->result = $this->xmlToArray($this->response);

        return $this->result;
    }

    /**
     * post請求xml
     * @return [type] [description]
     */
    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; //公衆號ID
        $this->params['mch_id'] = WxPayConf::MCHID; //商戶號
        $this->params['nonce_str'] = $this->createNoncestr();   //隨機字符串
        $this->params['sign'] = $this->getSign($this->params);  //簽名
        
        return $this->arrayToXml($this->params); 
    }

    

}

/**
 * 全部接口的基類
 */
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;
    }

    /**
     * 產生隨機字符串,不長於32位
     * @param  integer $length [description]
     * @return [type]          [description]
     */
    public function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }

        return $str;
    }

    /**
     * 格式化參數 拼接字符串,簽名過程須要使用
     * @param [type] $urlParams     [description]
     * @param [type] $needUrlencode [description]
     */
    public function ToUrlParams($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;
    }

    /**
     * 生成簽名
     * @param  [type] $params [description]
     * @return [type]         [description]
     */
    public function getSign($obj) {
        foreach ($obj as $k => $v) {
            $params[$k] = $v;
        }
        //簽名步驟一:按字典序排序參數
        ksort($params);
        $str = $this->ToUrlParams($params, false);  
        //簽名步驟二:在$str後加入key
        $str = $str."$key=".WxPayConf::KEY;
        //簽名步驟三:md5加密
        $str = md5($str);
        //簽名步驟四:全部字符轉爲大寫
        $result = strtoupper($str);

        return $result;
    }

    /**
     * array轉xml
     * @param  [type] $arr [description]
     * @return [type]      [description]
     */
    public function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $k => $v) {
            if (is_numeric($val)) {
                $xml .= "<".$key.">".$key."</".$key.">";
            } else {
                $xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    /**
     * 將xml轉爲array
     * @param  [type] $xml [description]
     * @return [type]      [description]
     */
    public function xmlToArray($xml) {
        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);

        return $arr;
    }

    /**
     * 以post方式提交xml到對應的接口
     * @param  [type]  $xml    [description]
     * @param  [type]  $url    [description]
     * @param  integer $second [description]
     * @return [type]          [description]
     */
    public function postXmlCurl($xml, $url, $second = 30) {
        //初始化curl
        $ch = curl_init();
        //設置超時
        curl_setopt($ch, CURL_TIMEOUT, $second);
        curl_setopt($ch, CURL_URL, $url);
        //這裏設置代理,若是有的話
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);
        //設置header
        curl_setopt($ch, CURL_HEADER, FALSE);
        //要求結果爲字符串且輸出到屏幕上
        curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);
        //以post方式提交
        curl_setopt($ch, CURL_POST, TRUE);
        curl_setopt($ch, CURL_POSTFIELDS, $xml);
        //執行curl
        $res = curl_exec($ch);

        if ($res) {
            curl_close($ch);
            return $res;
        } else {
            $error = curl_errno($ch);
            echo "curl出錯,錯誤碼:$error"."<br>";
            echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>錯誤緣由查詢</a></br>";
            curl_close($ch);
            return false;
        }
    }
}

/**
 * 配置類
 */
class WxPayConf {
    //微信公衆號身份的惟一標識。
    const APPID = 'wx654a22c6423213b7';
    //受理商ID,身份標識
    const MCHID = '10043241';
    const MCHNAME = 'KellyCen的博客';
    
    //商戶支付密鑰Key。
    const KEY = '0000000000000000000000000000000';
    //JSAPI接口中獲取openid
    const APPSECRET = '000000000000000000000000000';

    //證書路徑,注意應該填寫絕對路徑
    const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';
    const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';
    const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';

    //本例程經過curl使用HTTP POST方法,此處可修改其超時時間,默認爲30秒
    const CURL_TIMEOUT = 30;
}

模型:Wxpay_model.php
模型:Wxpay_model.php
<!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>

視圖:index.tpl
視圖: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="javascript:callpay();" id="btnOrder">點擊支付</a>
</body>  
<script type="text/javascript">
    //將數據付給js變量
    var wxJsApiData = {$wxJsApiData};
    function onBridgeReady()
        {
            //格式參考官方文檔 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>

視圖:confirm.tpl
視圖:confirm.tpl

  裏面所用到的一些自定義函數能夠在我上一篇博文裏找找,那裏已經提供了代碼參考了。

  

轉自:https://www.cnblogs.com/it-cen/p/4950186.html

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