php实现微信支付之退款功能

网上的很多PHP微信支付接入教程都颇为复杂，且需要配置和引入较多的文件，本人通过整理后给出一个单文件版的，希望可以给各位想接入微信支付的带来些许帮助和借鉴意义。

直接运行该文件即可给指定的微信用户退款。

需要注意的事项：

1.微信退款到零钱要求必传证书，需要到这里账户中心->账户设置->API安全->下载证书，然后修改代码中的证书路径 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。 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：微信公众平台支付接口调试工具4.错误码参照：参照地址

代码如下：

<?php/** * 关于微信退款的说明 * 1.微信退款要求必传证书，需要到https://pay.weixin.qq.com 账户中心->账户设置->API安全->下载证书，证书路径在第119行和122行修改 * 2.错误码参照 ：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4 */header("Content-type:text/html; Charset=utf-8");$mchid = "xxxxx";     //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送$appid = "xxxxx"; //微信支付申请对应的公众号的APPID$apiKey = "xxxxx";  //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥$orderNo = "";           //商户订单号（商户订单号与微信订单号二选一，至少填一个）$wxOrderNo = "";           //微信订单号（商户订单号与微信订单号二选一，至少填一个）$totalFee = 0.01;          //订单金额，单位:元$refundFee = 0.01;         //退款金额，单位:元$refundNo = "refund_".uniqid();    //退款订单号(可随机生成)$wxPay = new WxpayService($mchid,$appid,$apiKey);$result = $wxPay->doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo,$orderNo);if($result===true){  echo "refund success";exit();}echo "refund fail";class WxpayService{  protected $mchid;  protected $appid;  protected $apiKey;  public $data = null;  public function __construct($mchid, $appid, $key)  {    $this->mchid = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号    $this->appid = $appid; //微信支付申请对应的公众号的APPID    $this->apiKey = $key;  //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥  }  /**   * 退款   * @param float $totalFee 订单金额 单位元   * @param float $refundFee 退款金额 单位元   * @param string $refundNo 退款单号   * @param string $wxOrderNo 微信订单号   * @param string $orderNo 商户订单号   * @return string   */  public function doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo="",$orderNo="")  {    $config = array(      "mch_id" => $this->mchid,      "appid" => $this->appid,      "key" => $this->apiKey,    );    $unified = array(      "appid" => $config["appid"],      "mch_id" => $config["mch_id"],      "nonce_str" => self::createNonceStr(),      "total_fee" => intval($totalFee * 100),    //订单金额  单位 转为分      "refund_fee" => intval($refundFee * 100),    //退款金额 单位 转为分      "sign_type" => "MD5",      //签名类型 支持HMAC-SHA256和MD5，默认为MD5      "transaction_id"=>$wxOrderNo,        //微信订单号      "out_trade_no"=>$orderNo,    //商户订单号      "out_refund_no"=>$refundNo,    //商户退款单号      "refund_desc"=>"商品已售完",   //退款原因（选填）    );    $unified["sign"] = self::getSign($unified, $config["key"]);    $responseXml = $this->curlPost("https://api.mch.weixin.qq.com/secapi/pay/refund", self::arrayToXml($unified));    $unifiedOrder = simplexml_load_string($responseXml, "SimpleXMLElement", LIBXML_NOCDATA);    if ($unifiedOrder === false) {      die("parse xml error");    }    if ($unifiedOrder->return_code != "SUCCESS") {      die($unifiedOrder->return_msg);    }    if ($unifiedOrder->result_code != "SUCCESS") {      die($unifiedOrder->err_code);    }    return true;  }  public static function curlGet($url = "", $options = array())  {    $ch = curl_init($url);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    curl_setopt($ch, CURLOPT_TIMEOUT, 30);    if (!empty($options)) {      curl_setopt_array($ch, $options);    }    //https请求 不验证证书和host    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);    $data = curl_exec($ch);    curl_close($ch);    return $data;  }  public function curlPost($url = "", $postData = "", $options = array())  {    if (is_array($postData)) {      $postData = http_build_query($postData);    }    $ch = curl_init();    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    curl_setopt($ch, CURLOPT_POST, 1);    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);    curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数    if (!empty($options)) {      curl_setopt_array($ch, $options);    }    //https请求 不验证证书和host    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);    //第一种方法，cert 与 key 分别属于两个.pem文件    //默认格式为PEM，可以注释    curl_setopt($ch,CURLOPT_SSLCERTTYPE,"PEM");    curl_setopt($ch,CURLOPT_SSLCERT,getcwd()."/cert/apiclient_cert.pem");    //默认格式为PEM，可以注释    curl_setopt($ch,CURLOPT_SSLKEYTYPE,"PEM");    curl_setopt($ch,CURLOPT_SSLKEY,getcwd()."/cert/apiclient_key.pem");    //第二种方式，两个文件合成一个.pem文件//    curl_setopt($ch,CURLOPT_SSLCERT,getcwd()."/all.pem");    $data = curl_exec($ch);    curl_close($ch);    return $data;  }  public static function createNonceStr($length = 16)  {    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";    $str = "";    for ($i = 0; $i < $length; $i++) {      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);    }    return $str;  }  public static function arrayToXml($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 $xml;  }  public static function getSign($params, $key)  {    ksort($params, SORT_STRING);    $unSignParaString = self::formatQueryParaMap($params, false);    $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));    return $signStr;  }  protected static function formatQueryParaMap($paraMap, $urlEncode = false)  {    $buff = "";    ksort($paraMap);    foreach ($paraMap as $k => $v) {      if (null != $v && "null" != $v) {        if ($urlEncode) {          $v = urlencode($v);        }        $buff .= $k . "=" . $v . "&";      }    }    $reqPar = "";    if (strlen($buff) > 0) {      $reqPar = substr($buff, 0, strlen($buff) - 1);    }    return $reqPar;  }}?>

github下载地址

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