/**

* Created by snow.

* IDE: PhpStorm

* Date: 2019/3/29

* Time: 8:33

*/

namespace app\park\controller;

use think\Request;

class NewPay

{

private $APPID = ;//小程序ID

private $WE_CHAT_PAY_KEY = ;//微信支付秘钥

private $MCH_ID = ;//微信支付商户号

public function pay()

{

$request = Request::instance();

//fee: 支付的金额

//openId:从前端传来,

//notify:支付成功回调url,暂时不用

$openid=$request->post('open_id');

$billid=$request->post('bill_id');

$fee=$request->post('fee');

$payResult = $this->make($fee, '第二次付款', $request->ip(), $openid, '回调地址');

if (is_null($payResult)) {

return [

'code' => 300,

'msg' => 'pay error'

];

}

$orderId = $payResult['orderNum'];//随机生成的订单号

$responseData = $payResult['response'];

if (isset($responseData['return_code']) && $responseData['return_code'] == 'SUCCESS') {//下单成功

//构造返回数据

$dataArr = [

'appId' => $this->APPID,

'nonceStr' => $this->getRandChar(30),

'package' => 'prepay_id=' . $responseData['prepay_id'],

'signType' => 'MD5',

'timeStamp' => (string)time()

];

$dataArr['paySign'] = $this->signString($dataArr);

unset($dataArr['appId']);

return [

'code' => 200,

'result' => [

'billId' => $billid,

'payData' => $dataArr

],

];

}

//下单失败返回

return [

'code' => 400,

'msg' => 'make order error'

];

}

public function make($fee, $body, $requestIP, $openId, $notify)

{

$data['appid'] = $this->APPID;//小程序Id

$data['mch_id'] = $this->MCH_ID;//微信商户号

$data['nonce_str'] = $this->getRandChar(30);//30为随机字符

$data['out_trade_no'] = $this->makeOrderId();//商户订单号,10位时间戳+6位随机

$data['body'] = $body;//商品描述

$data['total_fee'] = $fee;//金额

$data['spbill_create_ip'] = $requestIP;//终端ip

$data['notify_url'] = $notify;//通知地址

$data['trade_type'] = 'JSAPI';

$data['openid'] = $openId;

$sign = $this->signString($data);

$data['sign'] = $sign;

$xmlData = $this->arrayToXML($data);

$result = $this->sendData($xmlData, 'https://api.mch.weixin.qq.com/pay/unifiedorder');

if (is_null($result)) {//网络错误

return null;

}

$payResult = $this->xmlToArray($result);

//xml字符串转数组,返回

return [

'orderNum' => $data['out_trade_no'],

'response' => $payResult

];

}

/*

* 发送数据到微信服务器,获取支付信息

*/

private function sendData($data, $url)

{

$ch = curl_init();

//设置获取的信息以文件流的形式返回，而不是直接输出。

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

//不校验ssl证书

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: text/xml']);

curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

curl_setopt($ch, CURLOPT_URL, $url);

$result = curl_exec($ch);

if (curl_errno($ch)) {

return null;

}

curl_close($ch);

return $result;

}

/**

* 生成签名

* @param $dataArr

* @return string

*/

public

function signString($dataArr)

{

ksort($dataArr);//参数必须由abcd排序

$buff = "";

foreach ($dataArr as $k => $v) {

if ($k != "sign" && $v != "" && !is_array($v)) {

$buff .= $k . "=" . $v . "&";

}

}

$buff = trim($buff, "&");

$buff .= '&key=' . $this->WE_CHAT_PAY_KEY;

return md5($buff);

}

/**

* 获取指定长度随机字符串

* @param $length

* @return null|string

*/

public

function getRandChar($length)

{

$str = null;

$strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";

$max = strlen($strPol) - 1;

for ($i = 0; $i < $length; $i++) {

$str .= $strPol[rand(0, $max)];

}

return $str;

}

/**

* 生成商户订单号,10位时间戳+6位随机

* @return string

*/

public

function makeOrderId()

{

return time() . mt_rand(100000, 999999);

}

/**

* 数组转xml

* @param $arr

* @return string

*/

public

function arrayToXML($arr)

{

$xml = "";

foreach ($arr as $key => $val) {

if (is_numeric($val)) {

$xml .= "" . $val . "" . $key . ">";

} else {

$xml .= "" . $key . ">";

}

}

$xml .= "";

return $xml;

}

/**

* xml字符串转数组

* @param $xmlStr

* @return array

*/

public function xmlToArray($xmlStr)

{

try {

return (array)simplexml_load_string($xmlStr, 'SimpleXMLElement', LIBXML_NOCDATA);

} catch (\Exception $e) {

return null;

}

}

}