<?php

header("Content-type: text/html; charset=utf-8");

include "../../config.php";

$orderBody = "test商品";

$tade_no = "abc_" . time();

$total_fee = 1;

$WxPayHelper = new WxPayHelper();

$response = $WxPayHelper->getPrePayOrder($orderBody, $tade_no, $total_fee);

p_val("---response----");

p_val($response);

p_val("---拿到prepayId再次签名----");

$x = $WxPayHelper->getOrder($response['prepay_id']);

p_val($x);

/**

 * convert xml string to php array - useful to get a serializable value

 *

 * @param string $xmlstr

 * @return array

 * @author Adrien aka Gaarf

 */

class WxPayHelper{

    /*

    配置参数

    */

    var $config = array(

        'appid' => "wx7e26b00000000000",    /*微信开放平台上的应用id*/

        'mch_id' => "1233000000",   /*微信申请成功之后邮件中的商户id*/

        'api_key' => "s6aITei3J3d4UYcCn3k0Mq0000000000",    /*在微信商户平台上自己设定的api密钥 32位*/

        'notify_url' => 'http://mycompany.com/pub_v2/pay/notify.v2.php' /*自定义的回调程序地址id*/

    );

    public function  __construct() {

    }

    //获取预支付订单

    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);

        //将微信返回的结果xml转成数组

        return $this->xmlstr_to_array($response);

    }

    //执行第二次签名，才能返回给客户端使用

    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;

    }

    /*

        生成签名

    */

    function getSign($Obj)

    {

        foreach ($Obj as $k => $v)

        {

            $Parameters[strtolower($k)] = $v;

        }

        //签名步骤一：按字典序排序参数

        ksort($Parameters);

        $String = $this->formatBizQueryParaMap($Parameters, false);

        //echo "【string】 =".$String."</br>";

        //签名步骤二：在string后加入KEY

        $String = $String."&key=".$this->config['api_key'];

        echo "<textarea style='width: 50%; height: 150px;'>$String</textarea> <br />";

        //签名步骤三：MD5加密

        $result_ = strtoupper(md5($String));

        return $result_;

    }

    //获取指定长度的随机字符串

    function getRandChar($length){

       $str = null;

       $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";

       $max = strlen($strPol)-1;

       for($i=0;$i<$length;$i++){

        $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数

       }

       return $str;

    }

    //数组转xml

    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;

    }

    //post https请求，CURLOPT_POSTFIELDS xml格式

    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);

        //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"."<br>";

            echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";

            curl_close($ch);

            return false;

        }

    }

    /*

        获取当前服务器的IP

    */

    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;

    }

    //将数组转成uri字符串

    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;

    }

    /**

    xml转成数组

    */

    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;

    }

}

?>