200行代碼實現微信支付-公衆號支付,再也不踩坑,附:demo

開發微信支付須要認證服務號而且已經開通微信支付,得到微信支付商ID,設置apikey了的。javascript

官方給了公衆號支付的php源碼SDK
可是這個SDK文件很是多,源碼亂七八糟的,真的一開始接觸的人拿着官方的SDK確定踩坑。
並且還不知道最後能不能用。php

我看到了一個做者寫的源碼,還不錯,我簡單進行優化了,只有200多行代碼就能夠實現公衆號支付。html

在開發以前,得先配置網頁受權的域名和支付受權域名。
網頁受權域名在公衆號後臺,接口權限找到網頁獲取用戶基本信息處配置你的代碼所在的目錄,例如你的公衆號支付代碼放在www.baidu.com/pay/jspai.phpjava

那麼網頁受權域名爲:www.baidu.com/pay/數據庫

支付受權域名配置要登陸商戶平臺json

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而後往下拉找到公衆號支付api

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添加受權目錄便可,受權目錄也是你的代碼所在目錄。安全

接着就能夠開發了
下面是代碼,直接能夠用。服務器

<?php
header('Content-type:text/html; Charset=utf-8');
$mchid = '微信支付商戶號';
$appid = '微信支付申請對應的公衆號的APPID';
$appKey = '微信支付申請對應的公衆號的APPSECRET'; 
$apiKey = 'API密鑰';   //商戶平臺-賬戶設置-安全設置-API安全-API密鑰-設置API密鑰
//①、獲取用戶openid
$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);
$openId = $wxPay->GetOpenid();      //獲取openid
if(!$openId) exit('獲取openid失敗');
//②、統一下單
$outTradeNo = uniqid();     //你本身的商品訂單號
$payAmount = 0.01;          //付款金額,單位:元
$orderName = 'test';    //訂單標題
$notifyUrl = 'https://www.likeyunba.com/pay/notify.php';     //付款成功後的回調地址(不要有問號)
$payTime = time();      //付款時間
$jsApiParameters = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);
$jsApiParameters = json_encode($jsApiParameters);
?>
    <html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1"/>
        <title>微信支付樣例-支付</title>
        <script type="text/javascript">
            //調用微信JS api 支付
            function jsApiCall()
            {
                WeixinJSBridge.invoke(
                    'getBrandWCPayRequest',
                    <?php echo $jsApiParameters; ?>,
                    function(res){
                        WeixinJSBridge.log(res.err_msg);
                        //alert(res.err_code+res.err_desc+res.err_msg);
                        if(res.err_msg == "get_brand_wcpay_request:ok"){
                            //支付成功跳轉頁面
                            window.location.href="http://www.likeyunba.com/pay/true.html";
                        }else{
                            //支付失敗/或取消支付跳轉頁面
                            window.location.href="http://www.likeyunba.com/pay/false.html";
                        }
                    }
                );
            }
            function callpay()
            {
                if (typeof WeixinJSBridge == "undefined"){
                    if( document.addEventListener ){
                        document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
                    }else if (document.attachEvent){
                        document.attachEvent('WeixinJSBridgeReady', jsApiCall);
                        document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
                    }
                }else{
                    jsApiCall();
                }
            }
        </script>
    </head>
    <body>
    <br/>
    <font color="#9ACD32"><b>該筆訂單支付金額爲<span style="color:#f00;font-size:50px"><?php echo $payAmount?>元</span>錢</b></font><br/><br/>
    <div align="center">
        <button style="width:210px; height:50px; border-radius: 15px;background-color:#FE6714; border:0px #FE6714 solid; cursor: pointer;  color:white;  font-size:16px;" type="button" onclick="callpay()" >當即支付</button>
    </div>
    </body>
    </html>
<?php
header("Content-Type:text/html; charset=utf-8");
class WxpayService
{
    protected $mchid;
    protected $appid;
    protected $appKey;
    protected $apiKey;
    public $data = null;
    public function __construct($mchid, $appid, $appKey,$key)
    {
        $this->mchid = $mchid; //https://pay.weixin.qq.com 產品中心-開發配置-商戶號
        $this->appid = $appid; //微信支付申請對應的公衆號的APPID
        $this->appKey = $appKey; //微信支付申請對應的公衆號的APP Key
        $this->apiKey = $key;   //https://pay.weixin.qq.com 賬戶設置-安全設置-API安全-API密鑰-設置API密鑰
    }
    /**
     * 經過跳轉獲取用戶的openid,跳轉流程以下:
     * 一、設置本身須要調回的url及其其餘參數,跳轉到微信服務器https://open.weixin.qq.com/connect/oauth2/authorize
     * 二、微信服務處理完成以後會跳轉回用戶redirect_uri地址,此時會帶上一些參數,如:code
     * @return 用戶的openid
     */
    public function GetOpenid()
    {
        //經過code得到openid
        if (!isset($_GET['code'])){
            //觸發微信返回code碼
            $scheme = $_SERVER['HTTPS']=='on' ? 'https://' : 'http://';
            $baseUrl = urlencode($scheme.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].$_SERVER['QUERY_STRING']);
            $url = $this->__CreateOauthUrlForCode($baseUrl);
            Header("Location: $url");
            exit();
        } else {
            //獲取code碼,以獲取openid
            $code = $_GET['code'];
            $openid = $this->getOpenidFromMp($code);
            return $openid;
        }
    }
    /**
     * 經過code從工做平臺獲取openid機器access_token
     * @param string $code 微信跳轉回來帶上的code
     * @return openid
     */
    public function GetOpenidFromMp($code)
    {
        $url = $this->__CreateOauthUrlForOpenid($code);
        $res = self::curlGet($url);
        //取出openid
        $data = json_decode($res,true);
        $this->data = $data;
        $openid = $data['openid'];
        return $openid;
    }
    /**
     * 構造獲取open和access_toke的url地址
     * @param string $code,微信跳轉帶回的code
     * @return 請求的url
     */
    private function __CreateOauthUrlForOpenid($code)
    {
        $urlObj["appid"] = $this->appid;
        $urlObj["secret"] = $this->appKey;
        $urlObj["code"] = $code;
        $urlObj["grant_type"] = "authorization_code";
        $bizString = $this->ToUrlParams($urlObj);
        return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
    }
    /**
     * 構造獲取code的url鏈接
     * @param string $redirectUrl 微信服務器回跳的url,須要url編碼
     * @return 返回構造好的url
     */
    private function __CreateOauthUrlForCode($redirectUrl)
    {
        $urlObj["appid"] = $this->appid;
        $urlObj["redirect_uri"] = "$redirectUrl";
        $urlObj["response_type"] = "code";
        $urlObj["scope"] = "snsapi_base";
        $urlObj["state"] = "STATE"."#wechat_redirect";
        $bizString = $this->ToUrlParams($urlObj);
        return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
    }
    /**
     * 拼接簽名字符串
     * @param array $urlObj
     * @return 返回已經拼接好的字符串
     */
    private function ToUrlParams($urlObj)
    {
        $buff = "";
        foreach ($urlObj as $k => $v)
        {
            if($k != "sign") $buff .= $k . "=" . $v . "&";
        }
        $buff = trim($buff, "&");
        return $buff;
    }
    /**
     * 統一下單
     * @param string $openid 調用【網頁受權獲取用戶信息】接口獲取到用戶在該公衆號下的Openid
     * @param float $totalFee 收款總費用 單位元
     * @param string $outTradeNo 惟一的訂單號
     * @param string $orderName 訂單名稱
     * @param string $notifyUrl 支付結果通知url 不要有問號
     * @param string $timestamp 支付時間
     * @return string
     */
    public function createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)
    {
        $config = array(
            'mch_id' => $this->mchid,
            'appid' => $this->appid,
            'key' => $this->apiKey,
        );
        $orderName = iconv('GBK','UTF-8',$orderName);
        $unified = array(
            'appid' => $config['appid'],
            'attach' => 'pay',             //商家數據包,原樣返回,若是填寫中文,請注意轉換爲utf-8
            'body' => $orderName,
            'mch_id' => $config['mch_id'],
            'nonce_str' => self::createNonceStr(),
            'notify_url' => $notifyUrl,
            'openid' => $openid,            //rade_type=JSAPI,此參數必傳
            'out_trade_no' => $outTradeNo,
            'spbill_create_ip' => '127.0.0.1',
            'total_fee' => intval($totalFee * 100),       //單位 轉爲分
            'trade_type' => 'JSAPI',
        );
        $unified['sign'] = self::getSign($unified, $config['key']);
        $responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));
        $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($unifiedOrder === false) {
            die('parse xml error');
        }
        if ($unifiedOrder->return_code != 'SUCCESS') {
            die($unifiedOrder->return_msg);
        }
        if ($unifiedOrder->result_code != 'SUCCESS') {
            die($unifiedOrder->err_code);
        }
        $arr = array(
            "appId" => $config['appid'],
            "timeStamp" => "$timestamp",        //這裏是字符串的時間戳,不是int,因此需加引號
            "nonceStr" => self::createNonceStr(),
            "package" => "prepay_id=" . $unifiedOrder->prepay_id,
            "signType" => 'MD5',
        );
        $arr['paySign'] = self::getSign($arr, $config['key']);
        return $arr;
    }
    public static function curlGet($url = '', $options = array())
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https請求 不驗證證書和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }
    public static function curlPost($url = '', $postData = '', $options = array())
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //設置cURL容許執行的最長秒數
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https請求 不驗證證書和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }
    public static function createNonceStr($length = 16)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }
    public static function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
        }
        $xml .= "</xml>";
        return $xml;
    }
    public static function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
        return $signStr;
    }
    protected static function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k . "=" . $v . "&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}
?>

notify.php微信

<?php
/**
 * 原生支付(掃碼支付)及公衆號支付的異步回調通知
 * 說明:須要在native.php或者jsapi.php中的填寫回調地址。例如:http://www.xxx.com/wx/notify.php
 * 付款成功後,微信服務器會將付款結果通知到該頁面
 */
header('Content-type:text/html; Charset=utf-8');
$mchid = '微信支付商戶號';
$appid = '公衆號APPID'; 
$apiKey = 'API密鑰'; 
$wxPay = new WxpayService($mchid,$appid,$apiKey);
$result = $wxPay->notify();
if($result){
    //完成你的邏輯
    //例如鏈接數據庫,獲取付款金額$result['cash_fee'],獲取訂單號$result['out_trade_no'],修改數據庫中的訂單狀態等;
}else{
    echo 'pay error';
}
class WxpayService
{
    protected $mchid;
    protected $appid;
    protected $apiKey;
    public function __construct($mchid, $appid, $key)
    {
        $this->mchid = $mchid;
        $this->appid = $appid;
        $this->apiKey = $key;
    }
    public function notify()
    {
        $config = array(
            'mch_id' => $this->mchid,
            'appid' => $this->appid,
            'key' => $this->apiKey,
        );
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($postObj === false) {
            die('parse xml error');
        }
        if ($postObj->return_code != 'SUCCESS') {
            die($postObj->return_msg);
        }
        if ($postObj->result_code != 'SUCCESS') {
            die($postObj->err_code);
        }
        $arr = (array)$postObj;
        unset($arr['sign']);
        if (self::getSign($arr, $config['key']) == $postObj->sign) {
            echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
            return $arr;
        }
    }
    /**
     * 獲取簽名
     */
    public static function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
        return $signStr;
    }
    protected static function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k . "=" . $v . "&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}

簡單說明:
1】新建jsapi.php,拷貝上面的代碼,修改商戶號、appid、appsecret、密鑰便可,還有下面的回調地址,前面的域名須要換成你的nofity.php的地址。至於支付成功和支付失敗跳轉的頁面按本身的需求修改便可。
要注意,訂單標題不能爲中文,不然會提示body參數錯誤什麼的。
2】新建nofity.php
把上面的代碼拷貝上去,修改商戶號、appid、密鑰便可。
上傳到支付受權目錄,而後訪問jsapi.php頁面測試。

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