基于thinkphp5框架实现微信小程序支付/退款/订单查询/退款查询的方法

/**
 * 预支付请求接口(POST)
 * @param string $openid openid
 * @param string $body 商品简单描述
 * @param string $order_sn 订单编号
 * @param string $total_fee 金额
 * @return json的数据
 */
 public function prepay()
 {
 tp_log('预支付请求数据===>' . json_encode($_POST), 'prepay', request()->controller());
 $goods_user = db('tf_goods_user')->where(array('order_no' => $_POST['order_no']))->find();
 $goods = db('tf_goods')->where(array('id' => $goods_user['goods_id']))->find();
 //判断产品的数量
 if (($goods['sales_initial'] - $goods['sales_actual']) <= 0) {
 $return['status'] = 0;
 $return['info'] = '此产品已售完';
 exit(json_encode($return));
 }

 $order_no = $_POST['order_no']; //订单号
 $is_sale = $_POST['is_sale'];
 $openid = $_POST['openid'];
 $goods_name = $_POST['goods_name'];
 $pay_price = $_POST['price'];
 $attach['is_sale'] = $_POST['is_sale'];
 $attach['sale_id'] = $_POST['sale_id'];
 $nonce_str = $this->nonce_str();//随机字符串


 $order_no_ssh = $this->get_orderssh(); //商户订单号
 //组装支付数据
 $data = [
 'appid' => config('pay.APPID'),
 'mch_id' => config('pay.MCHID'),
 'nonce_str' => $nonce_str,
 'body' => $goods_name, //商品名称组合
 'attach' => json_encode($attach),
 'out_trade_no' => $order_no_ssh,//$order_no, //订单号 商户订单号
 'total_fee' => intval($pay_price * 100),
 'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],
 'notify_url' => config('pay.NOTIFY_URL'),
 'trade_type' => 'JSAPI',
 'openid' => $openid
 ];

 //订单支付表创建订单支付数据
 $p_o_data['createtime'] = time();
 $p_o_data['order_no'] = $order_no;
 $p_o_data['order_no_ssh'] = $order_no_ssh;
 $p_o_data['ready'] = json_encode($data);
 $p_o_return = db('tf_pay_order')->insert($p_o_data);
 if(!$p_o_return){
 //失败
 $return['status'] = -1;
 $return['info'] = $p_o_data;
 exit(json_encode($return));
 }

 // 获取签名
 $sign = $this->makeSign($data);
 $data['sign'] = $sign;
 $xml = $this->toXml($data);
 $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder'; //发起支付接口链接
 //发起预支付请求
 $prepay_return_reslut_xml = $this->http_request($url, $xml);
 $xml_to_arr = $this->fromXml($prepay_return_reslut_xml);
 $return_result = json_encode($xml_to_arr, true);
 tp_log('预支付请求返回数据array===>' .$return_result , 'prepay', request()->controller());
 //记录预支付返回信息
 db('tf_goods_order')->where(array('order_no' => $order_no))
 ->update(array(
 'go_pay' => $return_result,
 'updatetime' => time(),
 'updateuser' => $openid
 ));
 if($xml_to_arr['return_code'] == 'SUCCESS' && $xml_to_arr['result_code'] == 'SUCCESS'){
 //成功

 $time = time();
 //临时数组用于签名
 $tmp = [
 'appId' => config('pay.APPID'),
 'nonceStr' => $nonce_str,
 'package' => 'prepay_id='.$xml_to_arr['prepay_id'],
 'signType' => 'MD5',
 'timeStamp' => "$time",
 ];
 $data['timeStamp'] = "$time";//时间戳
 $data['nonceStr'] = $nonce_str;//随机字符串
 $data['signType'] = 'MD5';//签名算法，暂支持 MD5
 $data['package'] = 'prepay_id='.$xml_to_arr['prepay_id'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
 $data['paySign'] = $this->makeSign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档;$data['out_trade_no'] = $out_trade_no;


 $return['status'] = 1;
 $return['info'] = $data;
 }else{
 //失败
 $return['status'] = -1;
 $return['info'] = $xml_to_arr;
 }
 exit(json_encode($return));
 }

 //curl请求
 public function http_request($url, $data = null, $headers = array())
 {
 $curl = curl_init();
 if (count($headers) >= 1) {
 curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
 }
 curl_setopt($curl, CURLOPT_URL, $url);


 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);


 if (!empty($data)) {
 curl_setopt($curl, CURLOPT_POST, 1);
 curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
 }
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 $output = curl_exec($curl);
 curl_close($curl);
 return $output;
 }

/**
 * 申请退款API
 * @param $transaction_id
 * @param double $total_fee 账单总金额
 * @param double $refund_fee 退款金额
 * @return bool
 * @throws BaseException
 */
 public function refund()
 {

 $transaction_id = '4200000712202007274705432240';
 $total_fee = '0.01';
 $refund_fee = '0.01';
 // 当前时间
 $time = time();
 // 生成随机字符串
 $nonceStr = md5($time . $transaction_id . $total_fee . $refund_fee);
 // API参数
 $params = [
 'appid' => config('pay.APPID'),
 'mch_id' => config('pay.MCHID'),
 'nonce_str' => $nonceStr,
 'transaction_id' => $transaction_id,
 'out_refund_no' => $time,
 'total_fee' => $total_fee * 100,
 'refund_fee' => $refund_fee * 100,
 'notify_url' => config('pay.NOTIFY_URL_REFUND'),//退款回调地址
 ];
 // 生成签名
 $params['sign'] = $this->makeSign($params);

 tp_log('退款请求数据===>' . json_encode($params), 'refund', request()->controller());

 // 请求API
 $url = 'https://api.mch.weixin.qq.com/secapi/pay/refund';
 $result = $this->post($url, $this->toXml($params), true, $this->getCertPem());
 $prepay = $this->fromXml($result);
 // 请求失败
 if (empty($result)) {
 throw new BaseException(['msg' => '微信退款api请求失败']);
 }
 // 格式化返回结果
 $prepay = $this->fromXml($result);
 tp_log('退款返回数据===>' . json_encode($prepay), 'refund', request()->controller());
 // 请求失败
// if ($prepay['return_code'] === 'FAIL') {
// throw new BaseException(['msg' => 'return_msg: ' . $prepay['return_msg']]);
// }
// if ($prepay['result_code'] === 'FAIL') {
// throw new BaseException(['msg' => 'err_code_des: ' . $prepay['err_code_des']]);
// }
 return true;
 }
 /**
 * 模拟POST请求
 * @param $url
 * @param array $data
 * @param bool $useCert
 * @param array $sslCert
 * @return mixed
 */
 public function post($url, $data = [], $useCert = false, $sslCert = [])
 {
 $header = [
 'Content-type: application/json;'
 ];
 $curl = curl_init();
 //如果有配置代理这里就设置代理
// if(WxPayConfig::CURL_PROXY_HOST != "0.0.0.0"
// && WxPayConfig::CURL_PROXY_PORT != 0){
// curl_setopt($ch,CURLOPT_PROXY, WxPayConfig::CURL_PROXY_HOST);
// curl_setopt($ch,CURLOPT_PROXYPORT, WxPayConfig::CURL_PROXY_PORT);
// }

 curl_setopt($curl, CURLOPT_URL, $url);
 curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
 curl_setopt($curl, CURLOPT_HEADER, false);
 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($curl, CURLOPT_POST, TRUE);
 curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
 if ($useCert == true) {
 // 设置证书：cert 与 key 分别属于两个.pem文件
 curl_setopt($curl, CURLOPT_SSLCERTTYPE, 'PEM');
 curl_setopt($curl, CURLOPT_SSLCERT, $sslCert['certPem']);
 curl_setopt($curl, CURLOPT_SSLKEYTYPE, 'PEM');
 curl_setopt($curl, CURLOPT_SSLKEY, $sslCert['keyPem']);
 }
 $result = curl_exec($curl);
 curl_close($curl);
 return $result;
 }

/**
 * 订单查询
 * @param $out_trade_no
 * @return mixed
 * @throws BaseException
 */
 public function orderquery()
 {
 $transaction_id = '4200000712202007274705432240';//微信订单号
 // 当前时间
 $time = time();
 // 生成随机字符串
 $nonce_str = md5($time . mt_rand(00000,99999));
 //API参数
 $params = [
 'appid' => config('pay.APPID'), //公众号ID
 'mch_id' => config('pay.MCHID'), //商户号
 'transaction_id' => $transaction_id, //商户订单号
 'nonce_str' => $nonce_str, // 随机字符串
 ];
 //生成签名
 $params['sign'] = $this->makeSign($params);
 //请求API
 $url = 'https://api.mch.weixin.qq.com/pay/orderquery';
 $result = $this->post($url, $this->toXml($params));
 $prepay = $this->fromXml($result);
 // 请求失败
 if ($prepay['return_code'] === 'FAIL') {
 throw new BaseException(['msg' => $prepay['return_msg'], 'code' => 0]);
 }
 if ($prepay['result_code'] === 'FAIL') {
 throw new BaseException(['msg' => $prepay['err_code_des'], 'code' => 0]);
 }
 return $prepay;
 }

/**
 * 退款查询
 * @param $out_trade_no
 * @return mixed
 * @throws BaseException
 */
 public function refundquery()
 {
 $transaction_id = '4200000712202007274705432240';//微信订单号
 // 当前时间
 $time = time();
 // 生成随机字符串
 $nonce_str = md5($time . mt_rand(00000,99999));
 //API参数
 $params = [
 'appid' => config('pay.APPID'), //公众号ID
 'mch_id' => config('pay.MCHID'), //商户号
 'transaction_id' => $transaction_id, //商户订单号
 'nonce_str' => $nonce_str, // 随机字符串
 ];
 //生成签名
 $params['sign'] = $this->makeSign($params);
 //请求API
 $url = 'https://api.mch.weixin.qq.com/pay/refundquery';
 $result = $this->post($url, $this->toXml($params));
 $prepay = $this->fromXml($result);
 dump($prepay);die;
 // 请求失败
 if ($prepay['return_code'] === 'FAIL') {
 throw new BaseException(['msg' => $prepay['return_msg'], 'code' => 0]);
 }
 if ($prepay['result_code'] === 'FAIL') {
 throw new BaseException(['msg' => $prepay['err_code_des'], 'code' => 0]);
 }
 return $prepay;
 }

public function index()
 {
 $data = file_get_contents('php://input');
 $data = $this->FromXml($data);
 tp_log('支付回调数据===>' . json_encode($data), 'index', request()->controller());
 // 保存微信服务器返回的签名sign
 $data_sign = $data['sign'];
 // sign不参与签名算法
 unset($data['sign']);
 $sign = $this->makeSign($data);//回调验证签名

 $str_success = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
 $str_error = '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[签名失败]]></return_msg></xml>';

 if (($sign === $data_sign) && ($data['return_code'] == 'SUCCESS') && ($data['result_code'] == 'SUCCESS')) {
 // 支付成功 进行你的逻辑处理
 }
echo $str_success;//str_error 告知微信 你已的逻辑处理完毕 不用再推送或再次推送你结果
 }

/*
 * 小程序 退款结果通知
 */
 public function refund(){

 $data = file_get_contents('php://input');
 $data = $this->FromXml($data);
 tp_log('退款回调数据===>' . json_encode($data), 'refund', request()->controller());

 //对加密的字符串解密
 $req_info_xml = openssl_decrypt(base64_decode($data['req_info']), 'aes-256-ecb', md5(config('pay.KEY')),OPENSSL_RAW_DATA);
 $req_info = $this->FromXml($req_info_xml);

// // 保存微信服务器返回的签名sign
// $data_sign = $data['sign'];
// // sign不参与签名算法
// unset($data['sign']);
// $sign = $this->makeSign($data);//回调验证签名
//
// $str_success = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
// $str_error = '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[签名失败]]></return_msg></xml>';
//
//
//
// if (($sign === $data_sign) && ($data['return_code'] == 'SUCCESS') && ($data['result_code'] == 'SUCCESS')) {
// tp_log('退款成功===>', 'refund', request()->controller());
// //去修改订单的状态 和支付回调的一样 修改成功 告知微信 不在推送
// }
 }

/**
 * 生成签名
 * @param $values
 * @return string 本函数不覆盖sign成员变量，如要设置签名需要调用SetSign方法赋值
 */
 private function makeSign($values)
 {
 //签名步骤一：按字典序排序参数
 ksort($values);
 $string = $this->toUrlParams($values);
 //签名步骤二：在string后加入KEY
 $string = $string . '&key=' . config('pay.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);
 return $result;
 }
 private function ToUrlParams($array)
 {
 $buff = "";
 foreach ($array as $k => $v) {
 if ($k != "sign" && $v != "" && !is_array($v)) {
 $buff .= $k . "=" . $v . "&";
 }
 }
 $buff = trim($buff, "&");
 return $buff;
 }

 /**
 * 输出xml字符
 * @param $values
 * @return bool|string
 */
 private function toXml($values)
 {
 if (!is_array($values)
 || count($values) <= 0
 ) {
 return false;
 }
 $xml = "<xml>";
 foreach ($values as $key => $val) {
 if (is_numeric($val)) {
 $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
 } else {
 $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
 }
 }
 $xml .= "</xml>";
 return $xml;
 }

 /**
 * 将xml转为array
 * @param $xml
 * @return mixed
 */
 private function fromXml($xml)
 {
 // 禁止引用外部xml实体
 libxml_disable_entity_loader(true);
 return json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
 }

 /**
 * 获取cert证书文件
 * @return array
 * @throws BaseException
 */
 private function getCertPem()
 {
// if (empty($this->config['cert_pem']) || empty($this->config['key_pem'])) {
// throw new BaseException(['msg' => '请先到后台小程序设置填写微信支付证书文件']);
// }
 // cert目录
 $filePath = EXTEND_PATH.'wxpay/cert/';
 return [
 'certPem' => $filePath . 'apiclient_cert.pem',
 'keyPem' => $filePath . 'apiclient_key.pem'
 ];
 }
/**
 * 生成商户订单号
 */
 public function get_orderssh()
 {
 return date("YmdHis") . mt_rand(10000000, 99999999);
 }