支付

思路，前端請求後端準備好的引數（用openid,course_id請求行 簽名等資訊），去支付，後端在回撥地址方法裡，寫支付成功後的業務邏輯

<?php
namespace Home\Controller;

use Think\Controller;
use Think\Model;
use Think\Controller\WechatAppPay;
include_once "wxBizDataCrypt.php";


class SmallwxController extends Controller
{
    protected $productModel;
    protected $orderModel;

    public function __construct(){
        parent::__construct();

        $this->alipy_log="/data/web/web/Public/notify_url.log";
        //證書路徑
        //$this->sslcert_path = './xxxx/cert/apiclient_cert.pem';
        //$this->sslkey_path  = './xxxx/cert/apiclient_key.pem';

        $this->sslcert_path = '/data/web/web/xxxx/example/cert/apiclient_cert.pem';
        $this->sslkey_path  = '/data/web/web/xxxx/example/cert/apiclient_key.pem';



        $this->productModel =D('Product');
        $this->orderModel = D('Order');
    }



//發起拼團時，去支付。（實戰課程拼團）
    public function unifiedOrder2() {
        $config = array('appid'=>"wxxxxxxxxxxxxxxxxx",'grant_type'=>"authorization_code",'appsecret'=>"41b0xxxxxxxxxxxxxxxxx",'mchid'=>'1xxxxxx401','key' => 'ece3c7b6bxxxxxx960d40a','sslcert_path'=>'./cert/apiclient_cert.pem','sslkey_path'=>'./cert/apiclient_key.pem','company'=>'xxx公司');
        $unifiedOrder = new \UnifiedOrder_pub($config);
        // 接收引數
        $data = I('post.','','strip_tags');
        $openid = $data['openid'];
        $total_fee = $data['price'];
        /*$key = $data['key'];
        $total_fee = $data['price'];
        // 獲取使用者的openid
        $where['session_id'] = $key;
        $oid = M('session2') ->field('session_value') -> where($where) -> find();*/

        //設定統一支付介面引數

        $pay_type = 'HR實戰課程';
        $out_trade_no = ordersn();
        $unifiedOrder->setParameter("body","HR實戰課程");//商品描述
        $unifiedOrder->setParameter("out_trade_no",$out_trade_no);//商戶訂單號
        $unifiedOrder->setParameter("total_fee",($total_fee * 100));//總金額
        $unifiedOrder->setParameter("product_id",($total_fee * 100));//總金額
        $unifiedOrder->setParameter("notify_url", 'http://www.xxxx.com/index.php/Home/Smallwx/notify');//通知地址 #測試
        $unifiedOrder->setParameter("trade_type","JSAPI");//交易型別
        $unifiedOrder->setParameter("time_start",date("YmdHis"));
        $unifiedOrder->setParameter("time_expire",date("YmdHis",time()+600));
        $unifiedOrder->setParameter("openid",$openid);

        //將組合資料再次簽名
        $prepayId = $unifiedOrder -> getPrepayId();
        $params = array();
        $params['appId'] = "wxxxxxxxxxxxxxxxxx";
        $params['timeStamp'] = ''.time();
        $params['nonceStr'] = md5(uniqid(mt_rand(),true));
        $params['nonceStr'] = $unifiedOrder -> createNoncestr();
        $params['package'] = 'prepay_id='.$prepayId;
        $params['signType'] = 'MD5';
        $sign = $unifiedOrder -> getSign($params);
        $params['paySign'] = $sign;
        // 返回支付引數
        $this -> ajaxReturn($params);

    }
 

回撥

 /**
     * 〈微信非同步通知頁面〉
     * @return[返回型別說明]
     */
    public function notify()
    {
        //使用通用通知介面
        $notify = new \Notify_pub();
        //儲存微信的回撥
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        $notify->saveData($xml);
      //將xml轉為array

        //驗證簽名，並回應微信。
        //對後臺通知互動時，如果微信收到商戶的應答不是成功或超時，微信認為通知失敗，
        //微信會通過一定的策略（如30分鐘共8次）定期重新發起通知，
        //儘可能提高通知的成功率，但微信不保證通知最終能成功。
        if($notify->checkSign() == FALSE){
            $notify->setReturnParameter("return_code","FAIL");//返回狀態碼
            $notify->setReturnParameter("return_msg","簽名失敗");//返回資訊
        }else{
            $notify->setReturnParameter("return_code","SUCCESS");//設定返回碼
        }
        $returnXml = $notify->returnXml();
        //echo $returnXml;

        //==商戶根據實際情況設定相應的處理流程，此處僅作舉例=======

        //以log檔案形式記錄回撥資訊
        //         $log_ = new Log_();
        //$log_name= "/data/web/web/Public/notify_url.log";//log檔案路徑

        //$this->log_result($log_name,"【接收到的notify通知】:\n".$xml."\n");
        log_into_txt($this->alipy_log,"【接收到的notify通知】:\n".$xml."\n");
        if($notify->checkSign() == TRUE)
        {


            if ($notify->data["return_code"] == "FAIL") {
                //此處應該更新一下訂單狀態，商戶自行增刪操作
                //$this->log_result($log_name,"【通訊出錯】:\n".$xml."\n");
                log_into_txt($this->alipy_log,"【通訊出錯】:\n".$xml."\n");
                $this->error("1");
            }
            elseif($notify->data["result_code"] == "FAIL"){
                //此處應該更新一下訂單狀態，商戶自行增刪操作
                log_into_txt($this->alipy_log,"【業務出錯】:\n".$xml."\n");
                $this->error("失敗2");
            }else{

            }

        }
    }
 

退款

    //拼團未成功時，退款
    public function OrderRefund(){ //$user_id,$out_trade_no,$transaction_id,$out_refund_no,$total_fee,$refund_fee,$refund_desc,$targetType='HR實戰拼團'
        //接收引數
    

        $out_trade_no   = 'HA167943625999159084';
        $out_refund_no  = 'HA167943625999159084';
        $transaction_id = '4200000193201810169207759790';
        $total_fee      = 0.01*100;//單位分//訂單金額
        $refund_fee     = 0.01*100;//單位分//退款金額
        $refund_desc    = '正常退款';
        $user_id        = I('user_id',107208);
        $targetType='HR實戰拼團';

        //呼叫退款介面
        $result = $this->refundWeChat($out_trade_no,$transaction_id,$out_refund_no,$total_fee,$refund_fee,$refund_desc,$targetType);

        //返回結果判斷
        $res2 = 0;
        if($result['return_code'] == 'SUCCESS' && $result['result_code'] == 'SUCCESS'){//退款成功
            log_into_txt($this->alipy_log,"【退款成功】:\n");
            $insert_data['status'] = 'success';
            $res2 = 1;

            //修改訂單狀態
            $res = $this->orderModel->updateOrderInfo($out_trade_no,['operation_state'=>6]);
            if($res === false){
                log_into_txt($this->alipy_log,"【product_order表,訂單狀態修改失敗】:\n");
                $insert_data['status'] = 'failed';
            }
        }else{
            log_into_txt($this->alipy_log,"【退款失敗】:\n");
            $insert_data['status'] = 'failed';
        }

        //返回資料儲存至,order_refund,表
        $insert_data['userId']         = $user_id;
        $insert_data['reundType']      = 'weChat';
        $insert_data['targetType']     = $targetType;
        $insert_data['expectedAmount'] = $refund_fee/100;
        $insert_data['actualAmount']   = $result['refund_fee']/100;
        $insert_data['createdTime']    = time();
        $insert_data['returnCode']     = $result['return_code'];
        $insert_data['returnMsg']      = $result['return_msg'];
        $insert_data['returnSubcode']  = $result['err_code'];
        $insert_data['returnSubmsg']   = $result['err_code_des'];
        $insert_data['out_trade_no']   = $out_trade_no;
        $insert_data['trade_no']       = $result['transaction_id'];
        $insert_data['buyer_logon_id'] = $result['appid'];
        $insert_data['buyer_user_id']  = $result['mch_id'];
        $insert_data['fund_change']    = $result['refund_fee'];
        $insert_data['gmt_refund_pay'] = date('Y-m-d H:i:s');
        $insert_data['sign']           = $result['sign'];
        log_into_txt($this->alipy_log,"【order_refund表資料】:".json_encode($insert_data)."\n");

        $res1 = M('order_refund')->data($insert_data)->add();
        log_into_txt($this->alipy_log,"【order_refund表資料入庫結果】:{$res1}\n",'foot');

        return $res2;
    }

    public function initWeChat($notify_type=''){
        //回撥地址
        $notify_url = "http://www.xxxx.com/index.php/Smallwx/notify";

        //統一初始化
        $appid        = "wxxxxxxxxxxxxxxxxx";//C('app_wechat_config.appid');
        $mch_id       = "1xxxxxxxxx";//C('app_wechat_config.mch_id');
        $key          = "exxxxxxxxxxxxxxxxxxxxxx";//C('app_wechat_config.key');
        $wechatAppPay = new \Home\Controller\WechatAppPay($appid, $mch_id, $notify_url, $key);

        return $wechatAppPay;
    }

    //微信-統一退款
    public function refundWeChat($out_trade_no,$transaction_id,$out_refund_no='',$total_fee,$refund_fee,$refund_desc='正常退款',$targetType=''){
        //初始化微信支付工具類
        $wechatAppPay = $this->initWeChat();

        $params['out_trade_no']   = $out_trade_no;//商戶系統內部訂單號
        $params['transaction_id'] = $transaction_id;//微信生成的訂單號
        $params['out_refund_no']  = $out_refund_no;//商戶系統內部的退款單號
        $params['total_fee']      = $total_fee; //訂單金額 只能為整數 單位為分
        $params['refund_fee']     = $refund_fee;//退款金額
        $params['refund_desc']    = $refund_desc;//商品描述
        $params['refund_account'] = 'REFUND_SOURCE_UNSETTLED_FUNDS';//退款資金來源,未結算資金退款,預設
        // $params['refund_account'] = 'REFUND_SOURCE_RECHARGE_FUNDS';//退款資金來源,可用餘額退款
        $params['sslcert_path']   = $this->sslcert_path;//證書pem格式.apiclient_cert.pem
        $params['sslkey_path']    = $this->sslkey_path;//證書金鑰pem格式,apiclient_key.pem
        log_into_txt($this->alipy_log,"【發起微信退款申請】:\n",'head');
        log_into_txt($this->alipy_log,"【申請來源】:{$targetType}\n");
        log_into_txt($this->alipy_log,"【微信退款請求引數】:".json_encode($params)."\n");
        $result = $wechatAppPay->refundOrder($params);
        log_into_txt($this->alipy_log,"【微信返回結果】:".json_encode($result)."\n");

        //驗籤
        $res=$wechatAppPay->checkSign($result);
        if($res){
            log_into_txt($this->alipy_log,"【驗籤成功】:\n");
            return $result;
        }else{
            log_into_txt($this->alipy_log,"【驗籤失敗】:\n");
            return false;
        }
    }
 

退款時用到的類

<?php
namespace Home\Controller;


/**
 * 微信支付伺服器端下單
 * 微信APP支付文件地址:  https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_6
 * 使用示例
 *  構造方法引數
 *      'appid'     =>  //填寫微信分配的公眾賬號ID
 *      'mch_id'    =>  //填寫微信支付分配的商戶號
 *      'notify_url'=>  //填寫微信支付結果回撥地址
 *      'key'       =>  //填寫微信商戶支付金鑰
 *  );
 *  統一下單方法
 *  $WechatAppPay = new wechatAppPay($options);
 *  $params['body'] = '商品描述';                   //商品描述
 *  $params['out_trade_no'] = '1217752501201407';   //自定義的訂單號，不能重複
 *  $params['total_fee'] = '100';                   //訂單金額 只能為整數 單位為分
 *  $params['trade_type'] = 'APP';                  //交易型別 JSAPI | NATIVE |APP | WAP
 *  $wechatAppPay->unifiedOrder( $params );
 */
class WechatAppPay
{
    //介面API URL字首
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
    //下單地址URL
    const UNIFIEDORDER_URL = "/pay/unifiedorder";
    //查詢訂單URL
    const ORDERQUERY_URL = "/pay/orderquery";
    //關閉訂單URL
    const CLOSEORDER_URL = "/pay/closeorder";
    //退款訂單URL
    const REFUNDORDER_URL = "/secapi/pay/refund";
    //公眾賬號ID
    private $appid;
    //商戶號
    private $mch_id;
    //隨機字串
    private $nonce_str;
    //簽名
    private $sign;
    //商品描述
    private $body;
    //商戶訂單號
    private $out_trade_no;
    //支付總金額
    private $total_fee;
    //終端IP
    private $spbill_create_ip;
    //支付結果回撥通知地址
    private $notify_url;
    //交易型別
    private $trade_type;
    //支付金鑰
    private $key;
    //證書路徑
    private $SSLCERT_PATH;
    private $SSLKEY_PATH;
    //所有引數
    private $params = array();
    public function __construct($appid, $mch_id, $notify_url, $key)
    {
        $this->appid      = $appid;
        $this->mch_id     = $mch_id;
        $this->notify_url = $notify_url;
        $this->key        = $key;
    }
    /**
     * 下單方法
     * @param   $params 下單引數
     */
    public function unifiedOrder( $params ){
        $this->body                       = $params['body'];
        $this->out_trade_no               = $params['out_trade_no'];
        $this->total_fee                  = $params['total_fee'];
        $this->trade_type                 = $params['trade_type'];
        $this->params['openid']           = $params['openid'];
        $this->nonce_str                  = $this->genRandomString();
        $this->spbill_create_ip           = $params['spbill_create_ip'] ? $params['spbill_create_ip'] :$_SERVER['REMOTE_ADDR'];
        $this->params['appid']            = $this->appid;
        $this->params['mch_id']           = $this->mch_id;
        $this->params['nonce_str']        = $this->nonce_str;
        $this->params['body']             = $this->body;
        $this->params['out_trade_no']     = $this->out_trade_no;
        $this->params['total_fee']        = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url']       = $this->notify_url;
        $this->params['trade_type']       = $this->trade_type;
        //獲取簽名資料
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) ){
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $result;
    }
    /**
     * 查詢訂單資訊
     * @param $out_trade_no     訂單號
     * @return array
     */
    public function orderQuery( $out_trade_no ){
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //獲取簽名資料
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) ){
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $result;
    }
    /**
     * 關閉訂單
     * @param $out_trade_no     訂單號
     * @return array
     */
    public function closeOrder( $out_trade_no ){
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //獲取簽名資料
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        return $result;
    }
    /**
     * 退款訂單
     * @param $out_trade_no     訂單號
     * @return array
     */
    public function refundOrder( $params ){
        //證書
        $this->SSLCERT_PATH            = $params['sslcert_path'];
        $this->SSLKEY_PATH             = $params['sslkey_path'];
        //請求引數
        $this->params['appid']         = $this->appid;
        $this->params['mch_id']        = $this->mch_id;
        $this->params['nonce_str']     = $this->genRandomString();
        $this->params['out_trade_no']  = $params['out_trade_no'];//商戶系統內部訂單號
        $this->params['out_refund_no'] = $params['out_refund_no'];//商戶系統內部的退款單號
        $this->params['total_fee']     = $params['total_fee'];//訂單總金額,單位為分,只能為整數
        $this->params['refund_fee']    = $params['refund_fee'];//退款總金額,單位為分,只能為整數
        $this->params['refund_desc']   = $params['refund_desc'];//退款原因
        $this->params['refund_account']= $params['refund_account'];//退款資金來源
        //獲取簽名資料
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::REFUNDORDER_URL,true);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        return $result;
    }
    /**
     *
     * 獲取支付結果通知資料
     * return array
     */
    public function getNotifyData(){
        //獲取通知的資料
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        $data = array();
        if( empty($xml) ){
            return false;
        }
        $data = $this->xml_to_data( $xml );
        if( !empty($data['return_code']) ){
            if( $data['return_code'] == 'FAIL' ){
                return false;
            }
        }
        return $data;
    }
    /**
     * 接收通知成功後應答輸出XML資料
     * @param string $xml
     */
    public function replyNotify(){
        $data['return_code'] = 'SUCCESS';
        $data['return_msg'] = 'OK';
        $xml = $this->data_to_xml( $data );
        echo $xml;
        die();
    }
     /**
      * 生成APP端支付引數
      * @param  $prepayid   預支付id
      */
     public function getAppPayParams( $prepayid ){
         $data['appid'] = $this->appid;
         $data['mch_id'] = $this->mch_id;
         $data['prepayId'] = $prepayid;
         $data['package'] = 'Sign=WXPay';
         $data['nonce_str'] = $this->genRandomString();
         $data['timestamp'] = time();
         $data['sign'] = $this->MakeSign( $data );
         $data['key'] = '5413A29BD915E1BCF870292FB4EC7852';
         return $data;
     }
    /**
     * 生成簽名
     *  @return 簽名
     */
    public function MakeSign( $params ){
        //簽名步驟一：按字典序排序陣列引數
        ksort($params);
        $string = $this->ToUrlParams($params);
        //簽名步驟二：在string後加入KEY
        $string = $string . "&key=".$this->key;
        //簽名步驟三：MD5加密
        $string = md5($string);
        //簽名步驟四：所有字元轉為大寫
        $result = strtoupper($string);
        return $result;
    }
    /**
     * [checkSign 回撥函式驗籤]
     * @param  [type] $tmpData [返回的資料,陣列]
     * @param  string $xml     [返回的資料,xml]
     * @return [type]          [description]
     */
    public function checkSign($tmpData,$xml='')
    {
        if($xml){
            $tmpData = $this->xml_to_data($xml);
        }
        $online_sign=$tmpData['sign'];//遠端接收的簽名
        unset($tmpData['sign']);
        $off_sign = $this->MakeSign($tmpData);//本地簽名
        if ($online_sign == $off_sign) {
            return 1;
        }
        return 0;
    }
    /**
     * [returnXml 輸出返回結果]
     * @param  [type] $tmpData [返回的資料]
     * @return [type]          [description]
     */
    public function returnXml($tmpData){
        header('Content-Type:application/json; charset=utf-8');
        header("Access-Control-Allow-Origin:*" );/*星號表示所有的域都可以接受，*/
        header("Access-Control-Allow-Methods:POST,GET" );
        header('Access-Control-Allow-Headers:origin, x-requested-with,x-requested_with, content-type, accept');

        $xml=$this->data_to_xml($tmpData);

        echo $xml;
        exit();
    }
    /**
     * 將引數拼接為url: key=value&key=value
     * @param   $params
     * @return  string
     */
    public function ToUrlParams( $params ){
        $string = '';
        if( !empty($params) ){
            $array = array();
            foreach( $params as $key => $value ){
                //校驗空值
                if(!$this->checkEmpty($value)){
                    $array[] = $key.'='.$value;
                }
            }
            $string = implode("&",$array);
        }
        return $string;
    }
    /**
     * 校驗$value是否非空
     *  if not set ,return true;
     *    if is null , return true;
     **/
    protected function checkEmpty($value) {
        if (!isset($value))
            return true;
        if ($value === null)
            return true;
        if (trim($value) === "")
            return true;
        if ($value === [])
            return true;

        return false;
    }
    /**
     * 輸出xml字元
     * @param   $params     引數名稱
     * return   string      返回組裝的xml
     **/
    public function data_to_xml( $params ){
        if(!is_array($params)|| count($params) <= 0)
        {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key=>$val)
        {
            if (is_numeric($val)){
                $xml.="<".$key.">".$val."</".$key.">";
            }else{
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml.="</xml>";
        return $xml;
    }
    /**
     * 將xml轉為array
     * @param string $xml
     * return array
     */
    public function xml_to_data($xml){
        if(!$xml){
            return false;
        }
        //將XML轉為array
        //禁止引用外部xml實體
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }
    /**
     * 獲取毫秒級別的時間戳
     */
    private static function getMillisecond(){
        //獲取毫秒的時間戳
        $time = explode ( " ", microtime () );
        $time = $time[1] . ($time[0] * 1000);
        $time2 = explode( ".", $time );
        $time = $time2[0];
        return $time;
    }
    /**
     * 產生一個指定長度的隨機字串,並返回給使用者
     * @param type $len 產生字串的長度
     * @return string 隨機字串
     */
    public function genRandomString($len = 32) {
        $chars = array(
            "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
            "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
            "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
            "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
            "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
            "3", "4", "5", "6", "7", "8", "9"
        );
        $charsLen = count($chars) - 1;
        // 將陣列打亂
        shuffle($chars);
        $output = "";
        for ($i = 0; $i < $len; $i++) {
            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;
    }
    /**
     * 以post方式提交xml到對應的介面url
     *
     * @param string $xml  需要post的xml資料
     * @param string $url  url
     * @param bool $useCert 是否需要證書，預設不需要
     * @param int $second   url執行超時時間，預設30s
     * @throws WxPayException
     */
    private function postXmlCurl($xml, $url, $useCert = false, $second = 30){
        $ch = curl_init();
        //設定超時
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
        //設定header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求結果為字串且輸出到螢幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if($useCert == true){
            //設定證書
            //使用證書：cert 與 key 分別屬於兩個.pem檔案
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
            curl_setopt($ch,CURLOPT_SSLCERT, $this->SSLCERT_PATH);
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
            curl_setopt($ch,CURLOPT_SSLKEY, $this->SSLKEY_PATH);
        }
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //執行curl
        $data = curl_exec($ch);
        //返回結果
        if($data){
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            return false;
        }
    }
    /**
      * 錯誤程式碼
      * @param  $code       伺服器輸出的錯誤程式碼
      * return string
      */
     public function error_code( $code ){
         $errList = array(
            'NOAUTH'                =>  '商戶未開通此介面許可權',
            'NOTENOUGH'             =>  '使用者帳號餘額不足',
            'ORDERNOTEXIST'         =>  '訂單號不存在',
            'ORDERPAID'             =>  '商戶訂單已支付，無需重複操作',
            'ORDERCLOSED'           =>  '當前訂單已關閉，無法支付',
            'SYSTEMERROR'           =>  '系統錯誤!系統超時',
            'APPID_NOT_EXIST'       =>  '引數中缺少APPID',
            'MCHID_NOT_EXIST'       =>  '引數中缺少MCHID',
            'APPID_MCHID_NOT_MATCH' =>  'appid和mch_id不匹配',
            'LACK_PARAMS'           =>  '缺少必要的請求引數',
            'OUT_TRADE_NO_USED'     =>  '同一筆交易不能多次提交',
            'SIGNERROR'             =>  '引數簽名結果不正確',
            'XML_FORMAT_ERROR'      =>  'XML格式錯誤',
            'REQUIRE_POST_METHOD'   =>  '未使用post傳遞引數 ',
            'POST_DATA_EMPTY'       =>  'post資料不能為空',
            'NOT_UTF8'              =>  '未使用指定編碼格式',
         );
         if( array_key_exists( $code , $errList ) ){
            return $errList[$code];
         }
     }
}