php 微信小程序支付代码实例

  public function pay(){
        //获取openid
         if($_GET['code']){   //用code获取openid
             $code=$_GET['code'];
             $WX_APPID =C('WX_APPID');//appid
             $WX_SECRET = C('WX_SECRET');//AppSecret
             $url = "https://api.weixin.qq.com/sns/jscode2session?appid=" .$WX_APPID. "&secret=" .$WX_SECRET. "&js_code=" .$code. "&grant_type=authorization_code";
              $infos = json_decode(file_get_contents($url));
             $openid = $infos->openid;
        }
        if($_GET['uid']){
                $where['id']=$_GET['uid'];
        }
        $oid=$_GET['oid'];
        //$fee = $_GET['price'];
        $fee = 0.01;//举例支付0.01
        $time = time();
        $out_trade_no=$this->order_number($openid);
        $param = array(
        'appid' => '',//小程序id
        'mch_id'=>'1247127301',//商户 idC('WX_ID')
        'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],//终端ip
        'notify_url'=>'http://bzl.isoft.mobi/index.php/Home/Pay/notify', //回调通知地址
        'nonce_str'=> $this->createNoncestr(),//随机字符串
        'out_trade_no'=>$out_trade_no,//商户订单编号
        'total_fee'=>$fee*100, //总金额
        'openid'=>$openid,//用户openid
        'trade_type'=>'JSAPI',//交易类型
        'body' =>'XXX消费', //商品信息
        );
        $aa['id']=$oid;
        $da['out_trade_no']=$out_trade_no;
        $order =M('order')->where($aa)->save($da); //给订单里生成订单编号
         //通过签名算法计算得出的签名值，详见签名生成算法
        $param['sign'] = $this->getSign($param);
        //var_dump($param);die;
        //将数组内容转为xml格式，向微信发出请求
        $xmlData = $this->arrayToXml($param);
        $xml_result = $this->postXmlCurl($xmlData,'https://api.mch.weixin.qq.com/pay/unifiedorder',60);
       // var_dump($xml_result,$xmlData);die;
        $array = $this->xmlToArray($xml_result);
           if($array['return_code'] == 'SUCCESS' && $array['result_code'] == 'SUCCESS'){
            $time = time();

            $key=C('WX_KEY');
            $tmp = [];//临时数组用于签名
            $tmp['appId'] = ' ';
            $tmp['nonceStr'] = $array['nonce_str'];
            $tmp['package'] = 'prepay_id='.$array['prepay_id'];
            $tmp['signType'] = 'MD5';
            $tmp['timeStamp'] = (string)$time;
            $result['nonceStr'] = $array['nonce_str'];//随机字符串
            $result['signType'] = 'MD5';//签名算法，暂支持 MD5
            $result['package'] = 'prepay_id='.$array['prepay_id'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
            $result['paySign'] = $this->getSign($tmp);
            $result['timeStamp'] =(string)$time;
            $result['appId'] = $array['appid'];
     
     
        }else{
            $result['return_code'] = $array['return_code'];
            $result['return_msg'] = $array['return_msg'];
        }

        echo json_encode($result,JSON_UNESCAPED_UNICODE);

    }

    //生成订单号
    private function order_number($openid){
        //date('Ymd',time()).time().rand(10,99);//18位
        return md5($openid.time().rand(10,99));//32位
    }

    /*
    * 对要发送到微信统一下单接口的数据进行签名
    */
    protected function getSign($Obj){
        foreach ($Obj as $k => $v){
            $param[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($param);
        $String = $this->formatBizQueryParaMap($param, false);
        //签名步骤二：在string后加入KEY
        $wx_key=C('WX_KEY'); //申请支付后有给予一个商户账号和密码，登陆后自己设置的key
        $String = $String."&key=".$wx_key;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
       // var_dump($result_);
        return $result_;
    }
    /*
     *排序并格式化参数方法，签名时需要使用
     */
    protected function formatBizQueryParaMap($paraMap, $urlencode){
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v){
            if($urlencode){
                $v = urlencode($v);
            }
            //$buff .= strtolower($k) . "=" . $v . "&";
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = "";
        if (strlen($buff) > 0){
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    /*
     * 生成随机字符串方法
     */
    protected function createNoncestr($length = 32 ){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ ) {
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }
    //数组转字符串方法
    protected function arrayToXml($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;
    }

    //将xml字符串转换为数组
    protected static function xmlToArray($xml){
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }

    //发送xml请求方法
    private static function postXmlCurl($xml, $url, $second = 30) {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        }else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new WxPayException("curl出错，错误码:$error");
        }
    }