dggjimai/extend/tools/WxxiaopayApi.php

<?php
namespace tools;

/**
 * 微信小程序支付
 *
 */
use Org\Util\Date;

class WxxiaopayApi {

    protected $APPID;
    protected $MCHID;
    protected $KEY;
    protected $notify_url;

    public function __construct($APPID,$MCHID,$KEY,$notify_url)
    {
        $this->APPID  = $APPID;
        $this->MCHID = $MCHID;
        $this->KEY = $KEY;
        $this->notify_url = $notify_url;
    }

    /**
     **$order_sn 原订单号
     **$order_sn 现订单号
     **$totalFee 价格
     **$openid
     **/
    //统一下单调用
    public function prePay($order_sn,$order_by_sn, $totalFee, $openid,$ip){
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $nonce_str = self::getRandChar_l(32);
        $data['appid'] =$this->APPID;
        $data['mch_id'] = $this->MCHID;
        $data['nonce_str'] = $nonce_str;
        $data['body'] = '订单编号：'.$order_sn;
        $data['out_trade_no'] = $order_by_sn;
        $data['total_fee'] = $totalFee*100;
        $data['spbill_create_ip'] =$ip;
        $data['notify_url'] = $this->notify_url;
        $data['trade_type'] = 'JSAPI';
        $data['openid'] = $openid;
        $data['sign'] = self::sign($data,$this->KEY);
        $xml = self::arrayToXml($data);
        $response = self::postXmlCurl($xml, $url);
        $array=self::xmlstr_to_array($response);
        $wxData = self::wxPay($array['prepay_id'],$this->APPID,$this->KEY);
        return $wxData;
    }

    //微信支付
    static function wxPay($prepayId,$APPID,$KEY){
        $data['appId'] = $APPID;
        $data['nonceStr'] = self::getRandChar_l(32);
        $data['package'] = "prepay_id=".$prepayId;
        $data['signType'] = 'MD5';
        $data['timeStamp'] = time();
        $data['sign'] =  self::getSign($data,$KEY);
        return $data;
    }



    ///生成签名
    static function getSign($Obj,$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);
        $String  = "appId=".$Obj['appId']."&nonceStr=".$Obj['nonceStr']."&package=".$Obj['package']."&signType=MD5&timeStamp=".$Obj['timeStamp'];
        // 签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $KEY;
        // 签名步骤三：MD5加密
        $result_ = strtoupper(md5($String));
        return $result_;
    }

    // xml转成数组
    static function xmlstr_to_array($xmlstr){
        //禁止引用外部xml实体

        libxml_disable_entity_loader(true);

        $xmlstring = simplexml_load_string($xmlstr, 'SimpleXMLElement', LIBXML_NOCDATA);

        $val = json_decode(json_encode($xmlstring),true);

        return $val;


    }


    // 获取指定长度的随机字符串
    protected 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;
    }


    // 将数组转成uri字符串
    static 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;
    }

    // 数组转xml
    static 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
    static 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;
        }
    }


    //生成签名
    static function sign($Obj,$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);
        $String = self::formatBizQueryParaMap($Parameters, false);
        // 签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $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
    static function getRandChar_l($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;
    }
}