//微信支付類
class WeiXinPay{
  //=======【基本信息設置】=====================================
  //微信公眾號身份的唯一標識
  protected $APPID = appid;//填寫您的appid。微信公眾平臺里的
  protected $APPSECRET = secret;
  //受理商ID，身份標識
  protected $MCHID = '11111111';//商戶id
  //商戶支付密鑰Key
  protected $KEY = '192006250b4c09247ec02edce69f6a2d';
  //回調(diào)通知接口
  protected $APPURL =   'https://smart.afei.com/receivesuc';
  //交易類型
  protected $TRADETYPE = 'JSAPI';
  //商品類型信息
  protected $BODY = 'wx/book';
  //微信支付類的構(gòu)造函數(shù)
  function __construct($openid,$outTradeNo,$totalFee){
    $this->openid = $openid; //用戶唯一標識
    $this->outTradeNo = $outTradeNo; //商品編號
    $this->totalFee = $totalFee; //總價
  }
  //微信支付類向外暴露的支付接口
  public function pay(){
    $result = $this->weixinapp();
    return $result;
  }
   //對微信統(tǒng)一下單接口返回的支付相關數(shù)據(jù)進行處理
   private function weixinapp(){
     $unifiedorder=$this->unifiedorder();
     $parameters=array(
     'appId'=>$this->APPID,//小程序ID
     'timeStamp'=>''.time().'',//時間戳
     'nonceStr'=>$this->createNoncestr(),//隨機串
     'package'=>'prepay_id='.$unifiedorder['prepay_id'],//數(shù)據(jù)包
     'signType'=>'MD5'//簽名方式
       );
     $parameters['paySign']=$this->getSign($parameters);
     return $parameters;
   }
  /*
   *請求微信統(tǒng)一下單接口
   */
  private function unifiedorder(){
    $parameters = array(
      'appid' => $this->APPID,//小程序id
      'mch_id'=> $this->MCHID,//商戶id
      'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],//終端ip
      'notify_url'=>$this->APPURL, //通知地址
      'nonce_str'=> $this->createNoncestr(),//隨機字符串
      'out_trade_no'=>$this->outTradeNo,//商戶訂單編號
      'total_fee'=>floatval($this->totalFee), //總金額
      'open_id'=>$this->openid,//用戶openid
      'trade_type'=>$this->TRADETYPE,//交易類型
      'body' =>$this->BODY, //商品信息
    );
    $parameters['sign'] = $this->getSign($parameters);
    $xmlData = $this->arrayToXml($parameters);
    $xml_result = $this->postXmlCurl($xmlData,'https://api.mch.weixin.qq.com/pay/unifiedorder',60);
    $result = $this->xmlToArray($xml_result);
    return $result;
  }
  //數(shù)組轉(zhuǎn)字符串方法
  protected function arrayToXml($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 $xml;
  }
  protected function xmlToArray($xml){
    $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    return $array_data;
  }
  //發(fā)送xml請求方法
  private static function postXmlCurl($xml, $url, $second = 30)
  {
    $ch = curl_init();
    //設置超時
    curl_setopt($ch, CURLOPT_TIMEOUT, $second);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //嚴格校驗
    //設置header
    curl_setopt($ch, CURLOPT_HEADER, FALSE);
    //要求結(jié)果為字符串且輸出到屏幕上
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    //post提交方式
    curl_setopt($ch, CURLOPT_POST, TRUE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
    curl_setopt($ch, CURLOPT_TIMEOUT, 40);
    set_time_limit(0);
    //運行curl
    $data = curl_exec($ch);
    //返回結(jié)果
    if ($data) {
      curl_close($ch);
      return $data;
    } else {
      $error = curl_errno($ch);
      curl_close($ch);
      throw new WxPayException("curl出錯，錯誤碼:$error");
    }
  }
  /*
   * 對要發(fā)送到微信統(tǒng)一下單接口的數(shù)據(jù)進行簽名
   */
  protected function getSign($Obj){
     foreach ($Obj as $k => $v){
     $Parameters[$k] = $v;
     }
     //簽名步驟一：按字典序排序參數(shù)
     ksort($Parameters);
     $String = $this->formatBizQueryParaMap($Parameters, false);
     //簽名步驟二：在string后加入KEY
     $String = $String."&key=".$this->KEY;
     //簽名步驟三：MD5加密
     $String = md5($String);
     //簽名步驟四：所有字符轉(zhuǎn)為大寫
     $result_ = strtoupper($String);
     return $result_;
   }
  /*
   *排序并格式化參數(shù)方法，簽名時需要使用
   */
  protected function formatBizQueryParaMap($paraMap, $urlencode)
  {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v)
    {
      if($urlencode)
      {
        $v = urlencode($v);
      }
      //$buff .= strtolower($k) . "=" . $v . "&";
      $buff .= $k . "=" . $v . "&";
    }
    $reqPar;
    if (strlen($buff) > 0)
    {
      $reqPar = substr($buff, 0, strlen($buff)-1);
    }
    return $reqPar;
  }
  /*
   * 生成隨機字符串方法
   */
  protected function createNoncestr($length = 32 ){
     $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
     $str ="";
     for ( $i = 0; $i < $length; $i++ ) {
     $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
     }
     return $str;
     }
}

````
 class WinXinRefund extends WeiXinPay{
  protected \$SSLCERT_PATH = 'cert/apiclient_cert.pem';//證書路徑
  protected \$SSLKEY_PATH = 'cert/apiclient_key.pem';//證書路徑
  protected \$opUserId = '1234567899';//商戶號
function __construct($openid,$outTradeNo,$totalFee,$outRefundNo,$refundFee){
  //初始化退款類需要的變量
  $this->openid = $openid;
  $this->outTradeNo = $outTradeNo;
  $this->totalFee = $totalFee;
  $this->outRefundNo = $outRefundNo;
  $this->refundFee = $refundFee;
} 
public function refund(){
  //對外暴露的退款接口
  $result = $this->wxrefundapi();
  return $result;
}
private function wxrefundapi(){
  //通過微信api進行退款流程
  $parma = array(
    'appid'=> $this->APPID,
    'mch_id'=> $this->MCHID,
    'nonce_str'=> $this->createNoncestr(),
    'out_refund_no'=> $this->outRefundNo,
    'out_trade_no'=> $this->outTradeNo,
    'total_fee'=> $this->totalFee,
    'refund_fee'=> $this->refundFee,
    'op_user_id' => $this->opUserId,
  );
  $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 $result;
}
//需要使用證書的請求
function postXmlSSLCurl($xml,$url,$second=30)
{
  $ch = curl_init();
  //超時時間
  curl_setopt($ch,CURLOPT_TIMEOUT,$second);
  //這里設置代理，如果有的話
  //curl_setopt($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($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
  //設置header
  curl_setopt($ch,CURLOPT_HEADER,FALSE);
  //要求結(jié)果為字符串且輸出到屏幕上
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
  //設置證書
  //使用證書：cert 與 key 分別屬于兩個.pem文件
  //默認格式為PEM，可以注釋
  curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
  curl_setopt($ch,CURLOPT_SSLCERT, $this->SSLCERT_PATH);
  //默認格式為PEM，可以注釋
  curl_setopt($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);
  //返回結(jié)果
  if($data){
    curl_close($ch);
    return $data;
  }
  else {
    $error = curl_errno($ch);
    echo "curl出錯，錯誤碼:$error"."<br>";
    curl_close($ch);
    return false;
  }
}}