本文主要是介绍php 微信退款,异步通知实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
需要注意的事项：
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1.微信退款到零钱要求必传证书，需要到https://pay.weixin.qq.com 账户中心->账户设置->API安全->下载证书，然后修改代码中的证书路径
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2.该文件需放到支付授权目录下，可以在微信支付商户平台->产品中心->开发配置中设置。
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3.如提示签名错误可以通过微信支付签名验证工具进行验证：https://pay.weixin.qq.com/wiki/tools/signverify/
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4 服务器也要授权这个证书路径的权限,不然没有权限会导致失败
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代码如下:
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向微信发起退款封装类
WxRefund.php
class WxRefund
{protected $SSLCERT_PATH;//证书路径protected $SSLKEY_PATH;//证书路径protected $key;//商户号function __construct($app_id, $mch_id, $key, $outRefundNo, $out_trade_no, $totalFee, $refundFee, $notify_url){/*初始化退款类需要的变量*/$this->app_id = $app_id;$this->mch_id = $mch_id;//商户号$this->outRefundNo = $outRefundNo;//自己订单后台升成的退款单号$this->out_trade_no = $out_trade_no;//商户系统内部订单号，要求32个字符内，只能是数字、大小写字母_-|*@ ，且在同一个商户号下唯一。$this->totalFee = $totalFee * 100;//微信以一分为单位,系统以元为单位故乘以100,订单总金额$this->refundFee = $refundFee * 100;//微信以一分为单位,系统以元为单位故乘以100,此次退款退的总金额$this->key = $key;$this->notify_url = $notify_url;$this->SSLCERT_PATH = '/home/tyuiyii89fdf5656565gpoeirdf_cert.pem';//证书在服务器中的绝对路径$this->SSLKEY_PATH = '/home/zyiyuiuiuiuuiusaldl3489usoij54_key.pem';//证书在服务器中的绝对路径}public function refundStart(){//对外暴露的退款接口$result = $this->wxrefundapi();return $result;}private function wxrefundapi(){//通过微信api进行退款流程$parma = array('appid' => $this->app_id,'mch_id' => $this->mch_id,//商户号'nonce_str' => $this->createNoncestr(32),'out_refund_no' => $this->outRefundNo,'out_trade_no' => $this->out_trade_no,'total_fee' => $this->totalFee,'refund_fee' => $this->refundFee,'notify_url'=>$this->notify_url);$parma['sign'] = $this->getSign($parma);$xmldata = $this->arrayToXml($parma);$xmlresult = $this->postXmlSSLCurl($xmldata, 'https://api.mch.weixin.qq.com/secapi/pay/refund');$result = $this->xmlToArray($xmlresult);return $result;}//需要使用证书的请求function postXmlSSLCurl($xml, $url, $second = 30){$ch = curl_init();//超时时间curl_setopt($ch, CURLOPT_TIMEOUT, $second);//这里设置代理，如果有的话//curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');//curl_setopt($ch,CURLOPT_PROXYPORT, 8080);curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);//设置headercurl_setopt($ch, CURLOPT_HEADER, FALSE);//要求结果为字符串且输出到屏幕上curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);//设置证书//使用证书：cert 与 key 分别属于两个.pem文件//默认格式为PEM，可以注释curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');curl_setopt($ch, CURLOPT_SSLCERT, $this->SSLCERT_PATH);//默认格式为PEM，可以注释curl_setopt($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, $xml);$data = curl_exec($ch);//返回结果if ($data) {curl_close($ch);return $data;} else {$error = curl_errno($ch);echo "curl出错，错误码:$error" . "<br>";curl_close($ch);return false;}}//作用：产生随机字符串，不长于32位private function createNoncestr($length = 32){$chars = "abcdefghijklmnopqrstuvwxyz0123456789";$str = "";for ($i = 0; $i < $length; $i++) {$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);}return $str;}//作用：生成签名private function getSign($Obj){foreach ($Obj as $k => $v) {$Parameters[$k] = $v;}//签名步骤一：按字典序排序参数ksort($Parameters);$String = $this->formatBizQueryParaMap($Parameters, false);//签名步骤二：在string后加入KEY$String = $String . "&key=" . $this->key;//签名步骤三：MD5加密$String = md5($String);//签名步骤四：所有字符转为大写$result_ = strtoupper($String);return $result_;}//数组转换成xmlprivate function arrayToXml($arr){$xml = "<xml>";foreach ($arr as $key => $val) {if (is_array($val)) {$xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";} else {$xml .= "<" . $key . ">" . $val . "</" . $key . ">";}}$xml .= "</xml>";return $xml;}//xml转换成数组private function xmlToArray($xml){//禁止引用外部xml实体libxml_disable_entity_loader(true);$xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);$val = json_decode(json_encode($xmlstring), true);return $val;}// 作用：格式化参数，签名过程需要使用private function formatBizQueryParaMap($paraMap, $urlencode){$buff = "";ksort($paraMap);foreach ($paraMap as $k => $v) {if ($urlencode) {$v = urlencode($v);}$buff .= $k . "=" . $v . "&";}$reqPar = '';if (strlen($buff) > 0) {$reqPar = substr($buff, 0, strlen($buff) - 1);}return $reqPar;}
}
$out_refund_no ='refund_'.uniqid() ;//退款单号,生成随机的64位字符串,不加特殊字符$appid = 123468998989;$mch_id = 6987656545556;$key = uere758589656765665;$money_amount=100;//订单总金额,单位元$refundFee = 50;//退款的金额 单位元,退款金额必须小于等于订单总金额$out_trade_no ='refund_'.uniqid(); //商户系统内部订单号，要求32个字符内，只能是数字、大小写字母_-|*@ ，且在同一个商户号下唯一。/*$notify_url 微信退款异步通知的地址*/$notify_url = 'https://www.cctv.cn/refundNotifyByWx';$start = new WxRefund($appid, $mch_id, $key, $out_refund_no, $out_trade_no,$money_amount, $refundFee);$result = $start->refundStart();/*return_code 此字段是通信标识，表示接口层的请求结果，并非退款状态*result_code SUCCESS退款申请接收成功，结果通过退款查询接口查询 FAIL 提交业务失败*/if (($result['return_code'] == 'SUCCESS') && ($result['result_code'] == 'SUCCESS')){echo '退款请求成功';}else{$reason = (empty($result['err_code_des'])) ? $result['return_msg'] : $result['err_code_des'];echo '退款请求失败原因:'.$reson;}
另一篇参考文章:https://www.cnblogs.com/lxwphp/p/9888604.html
异步接收微信通知类封装和使用
1.异步通知接收类封装
WxRefundNotify.php
class WxRefundNotify
{public $return_info;public function __construct($str, $key) {$str=$this->xmltoArray($str);if($str['return_code']=='SUCCESS'){$key=strtolower(MD5($key));$decrypt = base64_decode($str['req_info'], true);$this->return_info=$this->xmlToArray(openssl_decrypt($decrypt , 'aes-256-ecb', $key, OPENSSL_RAW_DATA));$this->return_info['return_code']='SUCCESS';}else{$this->return_info=['return_code'=>'FAIL','return_msg'=>$str['return_msg']];}}public function decryptData(){return $this->return_info;}public function xmlToArray($xml){libxml_disable_entity_loader(true); // 禁止引用外部xml实体$jsonxml = json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA));$result = json_decode($jsonxml, true);return $result;}
}
异步通知类的坑:
网上参考的文章:微信退款结果通知解密https://blog.csdn.net/tsummerb/article/details/78290554
下面是网上的微信退款结果通知解密代码:
function refund_decrypt($str, $key) {$str = base64_decode($str);$str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);$block = mcrypt_get_block_size('rijndael_128', 'ecb');$pad = ord($str[($len = strlen($str)) - 1]);$len = strlen($str);$pad = ord($str[$len - 1]);return substr($str, 0, strlen($str) - $pad);
}
$str="微信同步的加密串req_info";
$key=MD5('商户key');
$data=refund_decrypt($str, $key);
echo $data;- 其中 mcrypt_decrypt() 在php7.2的时候已经弃用了,会报错:
Call to undefined function mcrypt_decrypt()
用 openssl_decrypt()替换即可 - 参考PHP微信退款异步通知aes-256-ecb解密
2.异步通知类的使用
/*接收微信通知*/$post = input('post.');if ($post == null) {$post = file_get_contents("php://input");}if ($post == null) {$post = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';}if (empty($post) || $post == null || $post == '') {//阻止微信接口反复回调接口 文档地址 https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=9_7&index=7，下面这句非常重要!!!$str = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';echo $str;exit('Notify 非法回调');}$wx_config = getConfig();/*$key 商户秘钥key*/$key = $wx_config['key'];$weixin_data = new WxRefundNotify($post, $key);$result=$weixin_data->decryptData();//return_code此字段是通信标识，非交易标识，交易是否成功需要查看refund_status来判断if($result['return_code']=='SUCCESS'&&$result['refund_status']=='SUCCESS'){echo '退款成功';//退款成功之后的逻辑}else if($result['refund_status']=='CHANGE'){echo '退款异常';}else if($result['refund_status']=='REFUNDCLOSE'){echo '退款关闭';}
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