微信支付

<?php

namespace wechatpay;

use think\Exception;

class WechatPay
{
    //=======【基本信息设置】=====================================
    //微信公众号身份的唯一标识
    protected $APPID = "";//填写您的appid。微信公众平台里的
    protected $APPSECRET = "";
    //受理商ID，身份标识
    protected $MCHID = '';//商户id
    //商户支付密钥Key
    protected $KEY = '';
    //回调通知接口
    protected $APPURL = 'https://******/user/Allot/wechatCallback';
    //交易类型
    protected $TRADETYPE = 'JSAPI';
    //商品类型信息
    protected $BODY = '';
    //终端ip
    protected $IP = '';

    protected $SSLCERT_PATH = '';//证书路径

    protected $SSLKEY_PATH = '';//证书路径

    protected $openid;
    protected $totalFee;
    protected $out_trade_no;

    //微信支付类的构造函数
    public function __construct($openid, $totalFee, $out_trade_no)
    {
        $this->openid = $openid; //用户唯一标识
        $this->totalFee = $totalFee * 100; //总价
        $this->out_trade_no = $out_trade_no;//订单编号
    }

    //微信支付
    public function pay()
    {
        $result = $this->weixinapp();
        return $result;
    }

    //对微信统一下单接口返回的支付相关数据进行处理
    private function weixinapp()
    {
        $unifiedorder = $this->unifiedorder();
        $parameter = array(
            'appId' => $this->APPID,//小程序ID
            'timeStamp' => '' . time() . '',//时间戳
            'nonceStr' => $this->createNoncestr(),//随机串
            'package' => 'prepay_id=' . $unifiedorder['prepay_id'],//数据包
            'signType' => 'MD5'//签名方式
        );
        $parameter['paySign'] = $this->getSign($parameter);
        $parameter['out_trade_no'] = $unifiedorder['out_trade_no'];
        return $parameter;
    }

    /*
     *请求微信统一下单接口
     */
    private function unifiedorder()
    {
        $parameters = array(
            'appid' => $this->APPID,//小程序id
            'mch_id' => $this->MCHID,//商户id
            'spbill_create_ip' => $this->IP,//终端ip
            'notify_url' => $this->APPURL, //通知地址
            'nonce_str' => $this->createNoncestr(),//随机字符串
            'out_trade_no' => $this->out_trade_no,//商户订单编号
            'total_fee' => floatval($this->totalFee), //总金额
            'openid' => $this->openid,//用户openid
            'trade_type' => $this->TRADETYPE,//交易类型
            '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);
        $result['out_trade_no'] = $parameters['out_trade_no'];
        return $result;
    }

    public function order_number($openid)
    {
        return md5($openid . time() . rand(10, 99));//32位
    }


    //数组转字符串方法
    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;
    }

    //发送xml请求方法
    protected function postXmlCurl($xml, $url, $second = 30)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($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, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        //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($ch);
            throw new Exception("curl出错，错误码:$error");
        }
    }

    /*
     * 对要发送到微信统一下单接口的数据进行签名
     */
    protected function getSign($Obj)
    {
        foreach ($Obj as $k => $v) {
            $Parameters[$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=" . $this->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_;
    }

    /*
     *排序并格式化参数方法，签名时需要使用
     */
    protected function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }

    /*
     * 生成随机字符串方法
     */
    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;
    }
}