Method of WeChat payment on PHP APP

class Wxpayandroid
{
    //参数配置
    public $config = array(
                'appid' => "",    /*微信开放平台上的应用id*/
                'mch_id' => "",   /*微信申请成功之后邮件中的商户id*/
                'api_key' => "",    /*在微信商户平台上自己设定的api密钥 32位*/
            );
    
    //服务器异步通知页面路径(必填)
    public $notify_url = '';
    
    //商户订单号(必填，商户网站订单系统中唯一订单号)
    public $out_trade_no = '';

    //商品描述(必填，不填则为商品名称)
    public $body = '';
    
    //付款金额(必填)
    public $total_fee = 0;
    
    //自定义超时(选填，支持dhmc)
    public $time_expire = '';
    
    private $WxPayHelper;
    
    public function Weixinpayandroid($total_fee,$tade_no)
    {
        $this->total_fee = intval($total_fee * 100);//订单的金额 1元
        $this->out_trade_no = $tade_no;// date('YmdHis') . substr(time(), - 5) . substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 99));//订单号
        $this->body = 'wxpay';//支付描述信息
        $this->time_expire = date('YmdHis', time() + 86400);//订单支付的过期时间(eg:一天过期)
        $this->notify_url = "http://www.ceshi.com/notifyandroid";//异步通知URL(更改支付状态)
        //数据以JSON的形式返回给APP
        $app_response = $this->doPay();  
        if (isset($app_response['return_code']) && $app_response['return_code'] == 'FAIL') {
            $errorCode = 100;
            $errorMsg = $app_response['return_msg'];
            $this->echoResult($errorCode, $errorMsg);
        } else {
            $errorCode = 0;
            $errorMsg = 'success';
            $responseData = array(
                'notify_url' => $this->notify_url,
                'app_response' => $app_response,
            );
            $this->echoResult($errorCode, $errorMsg, $responseData);
        }
    }
    
    //接口输出
    function echoResult($errorCode = 0, $errorMsg = 'success', $responseData = array())
    {
        $arr = array(
            'errorCode' => $errorCode,
            'errorMsg' => $errorMsg,
            'responseData' => $responseData,
        );
         exit(json_encode($arr));      //exit可以正常发送给APP json数据
        // return json_encode($arr);  //在TP5中return这个json数据，APP接收到的是null,无法正常吊起微信支付
    }
    
    function getVerifySign($data, $key) 
    {
        $String = $this->formatParameters($data, false);
        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $key;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($String);
        return $result;
    }
    
    function formatParameters($paraMap, $urlencode) 
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if($k=="sign"){
                continue;
            }
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar;
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
    
    /**
     * 得到签名
     * @param object $obj
     * @param string $api_key
     * @return string
     */
    function getSign($obj, $api_key)
    {
        foreach ($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);
        //签名步骤二：在string后加入KEY
        $String = $String."&key=".$api_key;
        //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
     * @param int $length
     * @return Ambigous <NULL, string>
     */
    function getRandChar($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
     * @param array $arr
     * @return string
     */
    function arrayToXml($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; 
    }
    
    /**
     * 以post方式提交xml到对应的接口url
     *
     * @param string $xml  需要post的xml数据
     * @param string $url  url
     * @param bool $useCert 是否需要证书，默认不需要
     * @param int $second   url执行超时时间，默认30s
     * @throws WxPayException
     */
    function postXmlCurl($xml, $url, $second=30, $useCert=false, $sslcert_path=&#39;&#39;, $sslkey_path=&#39;&#39;)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch,CURLOPT_URL, $url);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
    
        if($useCert == true){
            curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE);
            curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//严格校验
            //设置证书
            //使用证书：cert 与 key 分别属于两个.pem文件
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,&#39;PEM&#39;);
            curl_setopt($ch,CURLOPT_SSLCERT, $sslcert_path);
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,&#39;PEM&#39;);
            curl_setopt($ch,CURLOPT_SSLKEY, $sslkey_path);
        }
        //post提交方式
        curl_setopt($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);
    
            curl_close($ch);
            return false;
        }
    }
    
    /**
     * 获取当前服务器的IP
     * @return Ambigous <string, unknown>
     */
    function get_client_ip()
    {
        if (isset($_SERVER[&#39;REMOTE_ADDR&#39;])) {
            $cip = $_SERVER[&#39;REMOTE_ADDR&#39;];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "127.0.0.1";
        }
        return $cip;
    }
 
    /**
     * 将数组转成uri字符串
     * @param array $paraMap
     * @param bool $urlencode
     * @return string
     */
    function formatBizQueryParaMap($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转数组
     * @param unknown $xml
     * @return mixed
     */
    function xmlToArray($xml) 
    {
        //将XML转为array
        $array_data = json_decode(json_encode(simplexml_load_string($xml, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA)), true);
        return $array_data;
    }
    public function chkParam() 
    {
        //用户网站订单号
        if (empty($this->out_trade_no)) {
            die(&#39;out_trade_no error&#39;);
        }   
        //商品描述
        if (empty($this->body)) {
            die(&#39;body error&#39;);
        }
        if (empty($this->time_expire)){
            die(&#39;time_expire error&#39;);
        }
        //检测支付金额
        if (empty($this->total_fee) || !is_numeric($this->total_fee)) {
            die(&#39;total_fee error&#39;);
        }
        //异步通知URL
        if (empty($this->notify_url)) {
            die(&#39;notify_url error&#39;);
        }
        if (!preg_match("#^http:\/\/#i", $this->notify_url)) {
            $this->notify_url = "http://" . $_SERVER[&#39;HTTP_HOST&#39;] . $this->notify_url;
        }
        return true;
    }
    
    /**
     * 生成支付(返回给APP)
     * @return boolean|mixed
     */
    public function doPay() {
        //检测构造参数
        $this->chkParam();
        return $this->createAppPara();
    }
    
    /**
     * APP统一下单
     */
    private  function createAppPara() 
    {
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        
        $data["appid"]        = $this->config[&#39;appid&#39;];//微信开放平台审核通过的应用APPID
        $data["body"]         = $this->body;//商品或支付单简要描述
        $data["mch_id"]       = $this->config[&#39;mch_id&#39;];//商户号
        $data["nonce_str"]    = $this->getRandChar(32);//随机字符串
        $data["notify_url"]   = $this->notify_url;//通知地址
        $data["out_trade_no"] = $this->out_trade_no;//商户订单号
        $data["spbill_create_ip"] = $this->get_client_ip();//终端IP
        $data["total_fee"]        = $this->total_fee;//总金额
        $data["time_expire"]      = $this->time_expire;//交易结束时间
        $data["trade_type"]       = "APP";//交易类型
        $data["sign"]             = $this->getSign($data, $this->config[&#39;api_key&#39;]);//签名
        $xml        = $this->arrayToXml($data);
        $response   = $this->postXmlCurl($xml, $url);
        //将微信返回的结果xml转成数组
        $responseArr = $this->xmlToArray($response);
        if(isset($responseArr["return_code"]) && $responseArr["return_code"]==&#39;SUCCESS&#39;){
            return  $this->getOrder($responseArr[&#39;prepay_id&#39;]);
        }
        return $responseArr;
    }
    
    /**
     * 执行第二次签名，才能返回给客户端使用
     * @param int $prepayId:预支付交易会话标识
     * @return array
     */
    public function getOrder($prepayId)
    {
        $data["appid"]      = $this->config[&#39;appid&#39;];
        $data["noncestr"]   = $this->getRandChar(32);
        $data["package"]    = "Sign=WXPay";
        $data["partnerid"]  = $this->config[&#39;mch_id&#39;];
        $data["prepayid"]   = $prepayId;
        $data["timestamp"]  = time();
        $data["sign"]       = $this->getSign($data, $this->config[&#39;api_key&#39;]);
        $data["packagestr"] = "Sign=WXPay";
        return $data;
    }
    
    /**
     * 异步通知信息验证
     * @return boolean|mixed
     */
    public function verifyNotify()
    {
        $xml = isset($GLOBALS[&#39;HTTP_RAW_POST_DATA&#39;]) ? $GLOBALS[&#39;HTTP_RAW_POST_DATA&#39;] : &#39;&#39;;  
        if(!$xml){
            return false;
        }
        $wx_back = $this->xmlToArray($xml);
        if(empty($wx_back)){
            return false;
        }
        $checkSign = $this->getVerifySign($wx_back, $this->config[&#39;api_key&#39;]);     
        if($checkSign=$wx_back[&#39;sign&#39;]){
            return $wx_back;
        }else{
            return false;
        }   
    }
}　　

vendor('Wxpayandroid');//引入支付类
class Wxpayandroid extends Controller 
{
//异步通知接口
    public function notifyandroid()
    {
        $wxpayandroid = new \Wxpayandroid;     //实例化微信支付类
        $verify_result = $wxpayandroid->verifyNotify(); 
        if ($verify_result['return_code']=='SUCCESS' && $verify_result['result_code']=='SUCCESS') {
        　　//商户订单号
        　　$out_trade_no = $verify_result['out_trade_no'];
        　　//交易号
        　　$trade_no     = $verify_result['transaction_id'];
        　　//交易状态
        　　$trade_status = $verify_result['result_code'];
        　　//支付金额
        　　$total_fee    = $verify_result['total_fee']/100;
        　　//支付过期时间
        　　$pay_date     = $verify_result['time_end'];
        　　$order = new Order();
        　　$ret = $order->getOrderN2($out_trade_no); //获取订单信息
        　　$total_amount=$ret['money'];
        　　if ($total_amount==$total_fee) {
            　　// 验证成功 修改数据库的订单状态等 $result['out_trade_no']为订单号
            　　//此处写自己的逻辑代码
        　　}
            exit(&#39;<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>&#39;);
        }else{
            exit(&#39;<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[ERROR]]></return_msg></xml>&#39;);
        }
    }

    //调用统一下单接口生成预支付订单并把数据返回给APP
    public function wxpayandroid(Request $request)
    {
        $param = $request->param(); //接收值

        $tade_no = $param[&#39;orderCode&#39;];
        $order = new Order();   //实例化订单
        $ret = $order->getOrderN2($tade_no);  //查询订单信息
        $total_fee = $ret[&#39;money&#39;]; //订单总金额
        
        $wxpayandroid = new \Wxpayandroid;     //实例化微信支付类
        $res = $wxpayandroid->Weixinpayandroid($total_fee,$tade_no);    //调用weixinpay方法
    }
}