授权获取二维码类：

<?php

/**

 * Trade类

 * @author xyyphp

 * @date 2016/10/10

 */

abstract class TradeController extends BaseController

{

        protected $mchid;

    protected $appid;

    protected $key;

    public function init()

    {

            parent::init();

            $this->mchid = WX_MCHID; // 微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送

            $this->appid = WX_APPID; //公众号APPID 通过微信支付商户资料审核后邮件发送

            $this->key = WX_APIKEY;   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥

    }

    /**

    * @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid

    * @param float $totalFee 收款总费用 单位元

    * @param string $outTradeNo 唯一的订单号

    * @param string $orderName 订单名称

    * @param string $notifyUrl 支付结果通知url 不要有问号

    * https://mp.weixin.qq.com/ 微信支付-开发配置-测试目录

    * 测试目录 http://mp.izhanlue.com/paytest/  最后需要斜线，(需要精确到二级或三级目录)

    * @return string

    */

    public function createJsBizPackage($totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)

    {

        $config = array(

                    'mch_id' => $this->mchid,

                    'appid' => $this->appid,

                    'key' => $this->key,

        );

        $unified = array(

            'appid' => $config['appid'],

            'attach' => '支付',             //商家数据包，原样返回

            'body' => $orderName,

            'mch_id' => $config['mch_id'],

            'nonce_str' => $this->createNonceStr(),

            'notify_url' => $notifyUrl,

            //'openid' => $openid,            //rade_type=JSAPI，此参数必传

            'out_trade_no' => $outTradeNo,

            'spbill_create_ip' => '127.0.0.1',

            'total_fee' => intval($totalFee * 100),       //单位 转为分

            'trade_type' => 'NATIVE',

        );

        $unified['sign'] = $this->getSign($unified, $config['key']);

        $responseXml = $this->curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', $this->arrayToXml($unified));

        /*

        <xml>

        <return_code><![CDATA[SUCCESS]]></return_code>

        <return_msg><![CDATA[OK]]></return_msg>

        <appid><![CDATA[wx00e5904efec77699]]></appid>

        <mch_id><![CDATA[1220647301]]></mch_id>

        <nonce_str><![CDATA[1LHBROsdmqfXoWQR]]></nonce_str>

        <sign><![CDATA[ACA7BC8A9164D1FBED06C7DFC13EC839]]></sign>

        <result_code><![CDATA[SUCCESS]]></result_code>

        <prepay_id><![CDATA[wx2015032016590503f1bcd9c30421762652]]></prepay_id>

        <trade_type><![CDATA[JSAPI]]></trade_type>

        </xml>

        */

        $unifiedOrder = simplexml_load_string($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);

            /*

            NOAUTH 商户无此接口权限

            NOTENOUGH 余额不足

            ORDERPAID 商户订单已支付

            ORDERCLOSED 订单已关闭

            SYSTEMERROR 系统错误

            APPID_NOT_EXIST   APPID不存在

            MCHID_NOT_EXIST MCHID不存在

            APPID_MCHID_NOT_MATCH appid和mch_id不匹配

            LACK_PARAMS 缺少参数

            OUT_TRADE_NO_USED 商户订单号重复

            SIGNERROR 签名错误

            XML_FORMAT_ERROR XML格式错误

            REQUIRE_POST_METHOD 请使用post方法

            POST_DATA_EMPTY post数据为空

            NOT_UTF8 编码格式错误

            */

        }

        //$unifiedOrder->trade_type 交易类型 调用接口提交的交易类型，取值如下：JSAPI，NATIVE，APP

        //$unifiedOrder->prepay_id 预支付交易会话标识 微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时

        //$unifiedOrder->code_url 二维码链接 trade_type为NATIVE是有返回，可将该参数值生成二维码展示出来进行扫码支付

                $code_list = (array)$unifiedOrder->code_url;

        $arr = array(

            "appId" => $config['appid'],

            "timeStamp" => $timestamp,

            "nonceStr" => $this->createNonceStr(),

            "package" => "prepay_id=" . $unifiedOrder->prepay_id,

            "signType" => 'MD5',

                        "code_url" => $code_list[0]

        );

        $arr['paySign'] = $this->getSign($arr, $config['key']);

        return $arr;

    }

        /**

         * 查询订单

    */

    public function orderQuery($outTradeNo)

    {

        $config = array(

                    'mch_id' => $this->mchid,

                    'appid' => $this->appid,

                    'key' => $this->key,

        );

        $unified = array(

            'appid' => $config['appid'],

            'mch_id' => $config['mch_id'],

            'out_trade_no' => $outTradeNo,

                        'nonce_str' => $this->createNonceStr()

        );

        $unified['sign'] = $this->getSign($unified, $config['key']);

        $responseXml = $this->curlPost('https://api.mch.weixin.qq.com/pay/orderquery', $this->arrayToXml($unified));

        /*

        <xml><return_code><![CDATA[SUCCESS]]></return_code>

                <return_msg><![CDATA[OK]]></return_msg>

                <appid><![CDATA[wx406c5455be1a2590]]></appid>

                <mch_id><![CDATA[1398638602]]></mch_id>

                <nonce_str><![CDATA[ousUeAEvH6KlDiGe]]></nonce_str>

                <sign><![CDATA[D8BFB54A52C324238D5A4BA8C8BC6D01]]></sign>

                <result_code><![CDATA[SUCCESS]]></result_code>

                <out_trade_no><![CDATA[1476157452]]></out_trade_no>

                <trade_state><![CDATA[NOTPAY]]></trade_state>

                <trade_state_desc><![CDATA[订单未支付]]></trade_state_desc>

                </xml>

        */

        $unifiedOrder = simplexml_load_string($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);

            /*

            NOAUTH 商户无此接口权限

            NOTENOUGH 余额不足

            ORDERPAID 商户订单已支付

            ORDERCLOSED 订单已关闭

            SYSTEMERROR 系统错误

            APPID_NOT_EXIST   APPID不存在

            MCHID_NOT_EXIST MCHID不存在

            APPID_MCHID_NOT_MATCH appid和mch_id不匹配

            LACK_PARAMS 缺少参数

            OUT_TRADE_NO_USED 商户订单号重复

            SIGNERROR 签名错误

            XML_FORMAT_ERROR XML格式错误

            REQUIRE_POST_METHOD 请使用post方法

            POST_DATA_EMPTY post数据为空

            NOT_UTF8 编码格式错误

            */

        }

        //$unifiedOrder->trade_type 交易类型 调用接口提交的交易类型，取值如下：JSAPI，NATIVE，APP

        //$unifiedOrder->prepay_id 预支付交易会话标识 微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时

        //$unifiedOrder->code_url 二维码链接 trade_type为NATIVE是有返回，可将该参数值生成二维码展示出来进行扫码支付

                /*

                public 'return_code' => string 'SUCCESS' (length=7)

                public 'return_msg' => string 'OK' (length=2)

                public 'appid' => string 'wx406c5455be1a2590' (length=18)

                public 'mch_id' => string '1398638602' (length=10)

                public 'nonce_str' => string 'lyt2ZGFeE9G0DI4W' (length=16)

                public 'sign' => string 'F942BB644E72FE29936C80E6780D8D8A' (length=32)

                public 'result_code' => string 'SUCCESS' (length=7)

                public 'out_trade_no' => string '1476157452' (length=10)

                public 'trade_state' => string 'NOTPAY' (length=6)

                public 'trade_state_desc' => string '订单未支付' (length=15)

                */

                //已结支付

                /*

                object(SimpleXMLElement)[26]

                    public 'return_code' => string 'SUCCESS' (length=7)

                    public 'return_msg' => string 'OK' (length=2)

                    public 'appid' => string 'wx406c5455be1a2590' (length=18)

                    public 'mch_id' => string '1398638602' (length=10)

                    public 'nonce_str' => string '6cFpzNc5BTyZ02x0' (length=16)

                    public 'sign' => string 'F01C79BD0FC4BC4FE38231BA92A91201' (length=32)

                    public 'result_code' => string 'SUCCESS' (length=7)

                    public 'openid' => string 'ojIdvuCVrweMrgaU-dFobIItTtpk' (length=28)

                    public 'is_subscribe' => string 'N' (length=1)

                    public 'trade_type' => string 'NATIVE' (length=6)

                    public 'bank_type' => string 'CFT' (length=3)

                    public 'total_fee' => string '1' (length=1)

                    public 'fee_type' => string 'CNY' (length=3)

                    public 'transaction_id' => string '4001652001201610116386495939' (length=28)

                    public 'out_trade_no' => string '1476161468' (length=10)

                    public 'attach' => string '支付' (length=6)

                    public 'time_end' => string '20161011125205' (length=14)

                    public 'trade_state' => string 'SUCCESS' (length=7)

                    public 'cash_fee' => string '1' (length=1)

                 */

                if (isset($unifiedOrder->trade_state_desc)){

                    $msg = "订单未支付";

                }

                if (isset($unifiedOrder->transaction_id)){

                    $msg = "已支付";

                }

                return $msg;

    }

    protected function notify()

    {

        $config = array(

                    'mch_id' => $this->mchid,

                    'appid' => $this->appid,

                    'key' => $this->key,

        );

        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

        /*

        $postStr = '<xml>

        <appid><![CDATA[wx00e5904efec77699]]></appid>

        <attach><![CDATA[支付测试]]></attach>

        <bank_type><![CDATA[CMB_CREDIT]]></bank_type>

        <cash_fee><![CDATA[1]]></cash_fee>

        <fee_type><![CDATA[CNY]]></fee_type>

        <is_subscribe><![CDATA[Y]]></is_subscribe>

        <mch_id><![CDATA[1220647301]]></mch_id>

        <nonce_str><![CDATA[a0tZ41phiHm8zfmO]]></nonce_str>

        <openid><![CDATA[oU3OCt5O46PumN7IE87WcoYZY9r0]]></openid>

        <out_trade_no><![CDATA[550bf2990c51f]]></out_trade_no>

        <result_code><![CDATA[SUCCESS]]></result_code>

        <return_code><![CDATA[SUCCESS]]></return_code>

        <sign><![CDATA[F6F519B4DD8DB978040F8C866C1E6250]]></sign>

        <time_end><![CDATA[20150320181606]]></time_end>

        <total_fee>1</total_fee>

        <trade_type><![CDATA[JSAPI]]></trade_type>

        <transaction_id><![CDATA[1008840847201503200034663980]]></transaction_id>

        </xml>';

        */

        $postObj = simplexml_load_string($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 ($this->getSign($arr, $config['key']) == $postObj->sign) {

            // $mch_id = $postObj->mch_id; //微信支付分配的商户号

            // $appid = $postObj->appid; //微信分配的公众账号ID

            // $openid = $postObj->openid; //用户在商户appid下的唯一标识

            // $transaction_id = $postObj->transaction_id;//微信支付订单号

            // $out_trade_no = $postObj->out_trade_no;//商户订单号

            // $total_fee = $postObj->total_fee; //订单总金额，单位为分

            // $is_subscribe = $postObj->is_subscribe; //用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效

            // $attach = $postObj->attach;//商家数据包，原样返回

            // $time_end = $postObj->time_end;//支付完成时间

            echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';

            return $postObj;

        }

    }

    /**

    * curl get

    * @param string $url

    * @param array $options

    * @return mixed

    */

       private 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请求 不验证证书和host

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

        $data = curl_exec($ch);

        curl_close($ch);

        return $data;

    }

    /**

    * curl post

    * @param string $url

    * @param array $options

    * @return mixed

    */

       private 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); //设置cURL允许执行的最长秒数

        if (!empty($options)) {

            curl_setopt_array($ch, $options);

        }

        //https请求 不验证证书和host

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

        $data = curl_exec($ch);

        curl_close($ch);

        return $data;

    }

    /**

    * 随机生成一定长度字符串

    * @param string $url

    * @param array $options

    * @return mixed

    */

       private 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;

    }

    /**

    * 数组转成XML

    * @param string $url

    * @param array $options

    * @return mixed

    */

       private 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;

    }

    /**

    * 例如：

    * appid：  wxd930ea5d5a258f4f

    * mch_id：  10000100

    * device_info： 1000

    * Body：  test

    * nonce_str： ibuaiVcKdpRxkhJA

    * 第一步：对参数按照 key=value 的格式，并按照参数名 ASCII 字典序排序如下：

    * stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_i

    * d=10000100&nonce_str=ibuaiVcKdpRxkhJA";

    * 第二步：拼接支付密钥：

    * stringSignTemp="stringA&key=192006250b4c09247ec02edce69f6a2d"

    * sign=MD5(stringSignTemp).toUpperCase()="9A0A8659F005D6984697E2CA0A9CF3B7"

    */

       private function getSign($params, $key)

    {

        ksort($params, SORT_STRING);

        $unSignParaString = $this->formatQueryParaMap($params, false);

        $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));

        return $signStr;

    }

    /**

    * 签名时字符组合

    * @param string $url

    * @param array $options

    * @return mixed

    */

       private 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;

    }

}

调取实例：

$money = 0.1;//订单金额

$out_trade_no = 'test_8888888';//唯一的订单号

$order_name = '测试订单';//订单名称

$notifyUrl = 'http://www.test.com/';//支付结果通知url 不要有问号

$timeStamp = time();//时间戳

//获取二维码信息

$wx_result = $this->createJsBizPackage($money, $out_trade_no, $order_name, $notifyUrl, $timeStamp);

//检测支付状态

$str_status = $this->orderQuery($out_trade_no);

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