微信支付

/**
    *@name 微信支付
    */
    function wxchatPay($body = '',$order_no = '',$total_fee = '',$spbill_create_ip = '') {
        require_once 'wx_config.php';//秘钥、appkey
//        $notify_url = "http://app.yuanmakj.com/api/wxpay/WxPayMain/notify_back.php";//回调函数
        $notify_url = "http://114.247.209.100:8099/api/wxpay/WxPayMain/notify_back.php";//回调函数
        $body = $body;
        $key = '';//key
           $post_data["appid"] = '';//微信账号ID
           $post_data["mch_id"] = '';//商户号
        $post_data["nonce_str"] = createStr();//随机字符串
        $post_data["body"] = '112';//商品描述
        $post_data["out_trade_no"] = '';//商户订单号
        $post_data["total_fee"] = '1';//总金额   金额不能带小数点
        $post_data["spbill_create_ip"] = '14.23.150.211';//终端IP
        $post_data["notify_url"] = $notify_url;//通知地址
        $post_data["trade_type"] = 'APP';//交易类型
        $post_data["sign"] = getSign($post_data,$key);//签名
        //使用方法
        file_put_contents('aa4.txt',var_export($post_data,TRUE),FILE_APPEND);
        $xml_data = arrayXml($post_data);
        file_put_contents('aa3.txt',var_export($xml_data,TRUE),FILE_APPEND);
        $wx_xml_date = send_post('https://api.mch.weixin.qq.com/pay/unifiedorder', $xml_data);
        //发送post请求结束
        file_put_contents('aa1.txt',var_export($wx_xml_date,TRUE),FILE_APPEND);
        $wx_str_date = xmlToArray($wx_xml_date);
        file_put_contents('aa2.txt',var_export($wx_str_date,TRUE),FILE_APPEND);
        $wx_str_date['timestamp'] = time().'';//时间戳
        $wx_str_date['packagevalue'] = 'Sign=WXPay';//扩展字段，暂时写死（Sign=WXPay）
        $res['appid'] = $wx_str_date['appid'].'';
        $res['partnerid'] = $wx_str_date['mch_id'].'';
        $res['prepayid'] = $wx_str_date['prepay_id'].'';
        $res['package'] = $wx_str_date['packagevalue'].'';
        $res['noncestr'] = $wx_str_date['nonce_str'].'';
        $res['timestamp'] = $wx_str_date['timestamp'].'';
        $wx_str_date['sign'] = getSign($res,$key);
        $wx_str_date['sign'] = $wx_str_date['sign'].'';
        return $wx_str_date;
    }
    function getSign($Obj,$key)
    {
        foreach ($Obj as $k => $v)
        {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = formatBizQueryParaMap($Parameters, false);
        //echo '【string1】'.$String.'</br>';
        //签名步骤二：在string后加入KEY
        if(!empty($key)){
            $String = $String."&key=".$key;
        }
        //echo "【string2】".$String."</br>";
        //签名步骤三：MD5加密
        $String = md5($String);
        //echo "【string3】 ".$String."</br>";
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        //echo "【result】 ".$result_."</br>";
        return $result_;
    }
    /**
     *     作用：格式化参数，签名过程需要使用
     */
    function formatBizQueryParaMap($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 $reqPar;
    }
    /**
     *     作用：array转xml
     */
    function arrayXml($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; 
    }

    /**
     * *获取随机字符串
     * @param  integer $length [description]
     * @return [type]          [description]
     */
    function createStr($length = 32){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789"; 
        $str = '';
        $max = strlen($chars)-1;
        for($i=0;$i<$length;$i++){
            $str .=$chars[mt_rand(0,$max)];
        }
        return $str;
    }    
    /**
     * 发送post请求
     * @param string $url 请求地址
     * @param array $post_data post键值对数据
     * @return string
     */
    function send_post($url, $post_data) {
        $options = array(
                            'http' => array(
                            'method' => 'POST',
                            'header' => 'Content-type:application/x-www-form-urlencoded',
                            'content' => "$post_data",
                            'timeout' => 15 * 60 // 超时时间（单位:s）
                            )
                        );
        $context = stream_context_create($options);
        $result = file_get_contents($url, false, $context);
        return $result;
    }
    /**
     *     作用：将xml转为array
     */
    function xmlToArray($xml)
    {
        //将XML转为array
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        // $array_data = json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA));
        return $array_data;
    }