APP微信支付php后端处理

 "",    
        'mch_id'     => "",   
        'api_key'    => "",    
        'notify_url' => 'http://XXXXXX/Wxpays/notify_url.php'
    );

    public function  __construct($appid, $mch_id, $api_key) {
		
		$this->config['appid']   = $appid;
		$this->config['mch_id']  = $mch_id;
		$this->config['api_key'] = $api_key;
        
    }

    
    public function getPrePayOrder($body, $out_trade_no, $total_fee){

        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        $notify_url = $this->config["notify_url"];
        $onoce_str = $this->getRandChar(32);
        $data["appid"]            = $this->config["appid"];
        $data["body"]             = $body;
        $data["mch_id"]           = $this->config['mch_id'];
        $data["nonce_str"]        = $onoce_str;
        $data["notify_url"]       = $notify_url;
        $data["out_trade_no"]     = $out_trade_no;
        $data["spbill_create_ip"] = $this->get_client_ip();
        $data["total_fee"]        = $total_fee;
        $data["trade_type"]       = "APP";
        $s = $this->getSign($data, false);
        $data["sign"] = $s;
        $xml = $this->arrayToXml($data);
        $response = $this->postXmlCurl($xml, $url);
        return $this->xmlstr_to_array($response);
    }


    public function getOrder($prepayId){
        $data["appid"]     = $this->config["appid"];
        $data["noncestr"]  = $this->getRandChar(32);
        $data["package"]   = "Sign=WXPay";
        $data["partnerid"] = $this->config['mch_id'];
        $data["prepayid"]  = $prepayId;
        $data["timestamp"] = time();
        $s = $this->getSign($data, false);
        $data["sign"] = $s;

        return $data;
    }


    function getSign($Obj)
    {
        foreach ($Obj as $k => $v)
        {
            $Parameters[strtolower($k)] = $v;
        }
 
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        $String = $String."&key=".$this->config['api_key'];
        $result_ = strtoupper(md5($String));
        return $result_;
    }




    function getRandChar($length){
       $str = null;
       $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
       $max = strlen($strPol)-1;

       for($i=0;$i<$length;$i++){
        $str.=$strPol[rand(0,$max)];
       }

       return $str;
    }



    function arrayToXml($arr)
    {
        $xml = "";
        foreach ($arr as $key=>$val)
        {
             if (is_numeric($val))
             {
                $xml.="<".$key.">".$val.""; 

             }
             else
                $xml.="<".$key.">";  
        }
        $xml.="";
        return $xml; 
    }

    function postXmlCurl($xml,$url,$second=30)
    {       
        //初始化curl        
        $ch = curl_init();
        //超时时间
        curl_setopt($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($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
		curl_setopt($ch,CURLOPT_VERBOSE, TRUE);
        //设置header
        curl_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);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data)
        {
            curl_close($ch);
            return $data;
        }
        else 
        { 
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."
";
            echo "错误原因查询
";
            curl_close($ch);
            return false;
        }
    }

    
    function get_client_ip()
    {
        if ($_SERVER['REMOTE_ADDR']) {
        $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
        $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
        $cip = getenv("HTTP_CLIENT_IP");
        } else {
        $cip = "unknown";
        }
        return $cip;
    }


    function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
               $v = urlencode($v);
            }
            $buff .= strtolower($k) . "=" . $v . "&";
        }
        $reqPar;
        if (strlen($buff) > 0) 
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    
    function xmlstr_to_array($xmlstr) {
      $doc = new DOMDocument();
      $doc->loadXML($xmlstr);
      return $this->domnode_to_array($doc->documentElement);
    }
    function domnode_to_array($node) {
      $output = array();
      switch ($node->nodeType) {
       case XML_CDATA_SECTION_NODE:
       case XML_TEXT_NODE:
        $output = trim($node->textContent);
       break;
       case XML_ELEMENT_NODE:
        for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {
         $child = $node->childNodes->item($i);
         $v = $this->domnode_to_array($child);
         if(isset($child->tagName)) {
           $t = $child->tagName;
           if(!isset($output[$t])) {
            $output[$t] = array();
           }
           $output[$t][] = $v;
         }
         elseif($v) {
          $output = (string) $v;
         }
        }
        if(is_array($output)) {
         if($node->attributes->length) {
          $a = array();
          foreach($node->attributes as $attrName => $attrNode) {
           $a[$attrName] = (string) $attrNode->value;
          }
          $output['@attributes'] = $a;
         }
         foreach ($output as $t => $v) {
          if(is_array($v) && count($v)==1 && $t!='@attributes') {
           $output[$t] = $v[0];
          }
         }
        }
       break;
      }
      return $output;
    }
}
?>