PHP实现微信退款的方法示例

本文实例讲述了php实现微信退款的方法。分享给大家供大家参考，具体如下：

$obj = new wxrefund('参数');
$obj->refundapi();

直接能用 公众号的参数 自己加上吧 只能帮你们到这了！

<?php
namespace wechat;
/**
 * 微信退款
 * @author    zzy
 * @version   $v1.0.0$
 * @date    2018-11-9
 */
class wxrefund
{
  protected $sslcert_path ='';//证书
  protected $sslkey_path = '';//证书
  protected $opuserid = '';//商户号
  protected $key = '';//api密钥
  protected $appid = '';//appid
  function __construct($outtradeno, $totalfee, $outrefundno, $refundfee)
  {
    //初始化退款类需要的变量
    $this->totalfee = $totalfee;//订单金额
    $this->refundfee = $refundfee;//退款金额
    $this->outtradeno = $outtradeno;//订单号
    $this->outrefundno = $outrefundno;//退款订单
  }
  /**
   * 通过微信api进行退款流程 唯一对外接口
   * @return string
   */
  public function refundapi()
  {
    $parma = array(
      'appid' => $this->appid,
      'mch_id' => $this->opuserid,
      'nonce_str' => randoms(32),//这个是随机数 自己封装去吧。。。
      'out_refund_no' => $this->outrefundno,
      'out_trade_no' => $this->outtradeno,
      'total_fee' => intval($this->totalfee * 100),
      'refund_fee' => intval($this->refundfee * 100),
    );
    $parma['sign'] = $this->getsign($parma, $this->key);
    $xmldata = $this->arraytoxml($parma);
    $xmlresult = $this->postxmlsslcurl($xmldata, 'https://api.mch.weixin.qq.com/secapi/pay/refund');
    $result = $this->arraytoxml($xmlresult);
    return $result;
  }
  /**
   * 数组转xml
   * @param $arr
   * @return string
   */
  protected function arraytoxml($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;
  }
  /**
   * 签名加密
   * @param $params
   * @param $key
   */
  protected function getsign($params, $key)
  {
    ksort($params, sort_string);
    $unsignparastring = $this->formatqueryparamap($params, false);
    return $signstr = strtoupper(md5($unsignparastring . "&key=" . $key));
  }
  /**
   * 排序
   * @param $paramap
   * @param bool $urlencode
   * @return bool|string
   */
  protected function formatqueryparamap($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;
  }
  /**
   * 需要使用证书的请求
   * @param $xml
   * @param $url
   * @param int $second
   * @return bool|mixed
   */
  protected function postxmlsslcurl($xml, $url, $second = 30)
  {
    $ch = curl_init();
    curl_setopt($ch, curlopt_timeout, $second);
    curl_setopt($ch, curlopt_url, $url);
    curl_setopt($ch, curlopt_ssl_verifypeer, false);
    curl_setopt($ch, curlopt_ssl_verifyhost, false);
    curl_setopt($ch, curlopt_header, false);
    curl_setopt($ch, curlopt_returntransfer, true);
    curl_setopt($ch, curlopt_sslcerttype, 'pem');
    curl_setopt($ch, curlopt_sslcert, $this->sslcert_path);
    curl_setopt($ch, curlopt_sslkeytype, 'pem');
    curl_setopt($ch, curlopt_sslkey, $this->sslkey_path);
    curl_setopt($ch, curlopt_post, true);
    curl_setopt($ch, curlopt_postfields, $xml);
    $data = curl_exec($ch);
    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;
    }
  }
}

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希望本文所述对大家php程序设计有所帮助。