摘要：效果如下需要注意的事項該文件需放到支付授權目錄下，可以在微信支付商戶平臺產品中心開發配置中設置。

網上的很多PHP微信掃碼支付接入教程都頗為復雜，且需要配置和引入較多的文件，本人通過整理后給出一個單文件版的，希望可以給各位想接入微信掃碼支付的帶來些許幫助和借鑒意義。

將該文件放到你的授權目錄下，并在微信里訪問這個文件，即可看到演示效果。效果如下：

需要注意的事項：
1.該文件需放到支付授權目錄下，可以在微信支付商戶平臺->產品中心->開發配置中設置。
2.如提示簽名錯誤可以通過微信支付簽名驗證工具進行驗證：https://pay.weixin.qq.com/wik...

代碼如下：

GetOpenid();      //獲取openid
if(!$openId) exit("獲取openid失敗");
//②、統一下單
$outTradeNo = uniqid();     //你自己的商品訂單號
$payAmount = 0.01;          //付款金額，單位:元
$orderName = "支付測試";    //訂單標題
$notifyUrl = "https://www.xxx.com/wx/";     //付款成功后的回調地址(不要有問號)
$payTime = time();      //付款時間
$jsApiParameters = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);
$jsApiParameters = json_encode($jsApiParameters);
?>
    
    
        
        
        
        
    
    
    

    該筆訂單支付金額為元錢


    

        立即支付
    
    
    
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眾號的APPID
        $this->appKey = $appKey; //微信支付申請對應的公眾號的APP Key
        $this->apiKey = $key;   //https://pay.weixin.qq.com 帳戶設置-安全設置-API安全-API密鑰-設置API密鑰
    }

    /**
     * 通過跳轉獲取用戶的openid，跳轉流程如下：
     * 1、設置自己需要調回的url及其其他參數，跳轉到微信服務器https://open.weixin.qq.com/connect/oauth2/authorize
     * 2、微信服務處理完成之后會跳轉回用戶redirect_uri地址，此時會帶上一些參數，如：code
     * @return 用戶的openid
     */
    public function GetOpenid()
    {
        //通過code獲得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;
        }
    }

    /**
     * 通過code從工作平臺獲取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連接
     * @param string $redirectUrl 微信服務器回跳的url，需要url編碼
     * @return 返回構造好的url
     */
    private function __CreateOauthUrlForCode($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【網頁授權獲取用戶信息】接口獲取到用戶在該公眾號下的Openid
     * @param float $totalFee 收款總費用 單位元
     * @param string $outTradeNo 唯一的訂單號
     * @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，如果填寫中文，請注意轉換為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 轉為分
            "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",        //這里是字符串的時間戳，不是int，所以需加引號
            "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允許執行的最長秒數
        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)
    {
        $xml = "";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "";
            } else
                $xml .= "<" . $key . ">";
        }
        $xml .= "";
        file_put_contents("1.txt",$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;
    }
}
?>

github下載地址：https://github.com/dedemao/we...