小程序支付功能

小程序访问php

　　/**
     * 支付测试
     */
    public function wxpayTest()
    {
        $appid = C('WX_APPID');
        // $openid = I('openid');
        $openid = '';
        $mch_id = C('MCH_ID');  //商户号
        $key = C('KEY'); //API
        $out_trade_no = '102';  //订单号
        $body = 'test';
        $total_fee = 1;
        Vendor('Wxpay.WeixinPay');
        $wxPay = new \WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);
        $return = $wxPay->pay();

        $this->ajaxReturn($return,'json');
        // var_dump($openid);
    }

 

WeixinPay.php:

<?php


/*
 * 小程序微信支付
 */


class WeixinPay {


    protected $appid;
    protected $mch_id;
    protected $key;
    protected $openid;
    protected $out_trade_no;
    protected $body;
    protected $total_fee;
    function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) {
        $this->appid = $appid;
        $this->openid = $openid;
        $this->mch_id = $mch_id;
        $this->key = $key;
        $this->out_trade_no = $out_trade_no;
        $this->body = $body;
        $this->total_fee = $total_fee;
    }


    public function pay() {
        //统一下单接口
        $return = $this->weixinapp();
        return $return;
    }


    //统一下单接口
    private function unifiedorder() {
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $parameters = array(
            'appid' => $this->appid, //小程序ID
            'mch_id' => $this->mch_id, //商户号
            'nonce_str' => $this->createNoncestr(), //随机字符串
//            'body' => 'test', //商品描述
            'body' => $this->body,
//            'out_trade_no' => '2015450806125348', //商户订单号
            'out_trade_no'=> $this->out_trade_no,
//            'total_fee' => floatval(0.01 * 100), //总金额 单位 分
            'total_fee' => $this->total_fee,
           // 'spbill_create_ip' => '192.168.0.161', //终端IP
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
            'notify_url' => 'http://回调地址/', //通知地址  确保外网能正常访问
            'openid' => $this->openid, //用户id
            'trade_type' => 'JSAPI'//交易类型
        );
        // var_dump($parameters);
        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $xmlData = $this->arrayToXml($parameters);
        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
        return $return;
    }


    private static 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);
        set_time_limit(0);


        //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($ch);
            throw new WxPayException("curl出错，错误码:$error");
        }
    }
    

    private function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }


    //xml转换成数组
    private function xmlToArray($xml) {


        //禁止引用外部xml实体 


        libxml_disable_entity_loader(true);


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


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


        return $val;
    }


    //微信小程序接口
    private function weixinapp() {
        //统一下单接口
        $unifiedorder = $this->unifiedorder();
       // print_r($unifiedorder);
        $parameters = 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
        );
        //签名
        $parameters['paySign'] = $this->getSign($parameters);
        return $parameters;
    }


    //作用：产生随机字符串，不长于32位
    private 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;
    }


    //作用：生成签名
    private 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_;
    }


    ///作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar;
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }


}

 

小程序页面处理：

/*支付测试 */
        wx.request({
            url: getApp().interFaceUrl._url + 'Home/Wx/wxpayTest',
            method: 'POST',
            data: {},
            header: {
                'content-type': 'application/x-www-form-urlencoded'
            },
            success: function (res) {
                console.log(res.data);
                console.log('调起支付');
                wx.requestPayment({
                    'timeStamp': res.data.timeStamp,
                    'nonceStr': res.data.nonceStr,
                    'package': res.data.package,
                    'signType': 'MD5',
                    'paySign': res.data.paySign,
                    success: function (res) {
                        console.log('success');
                    },
                    fail: function (res) {
                        console.log('fail'); 
                    }
                })
            }
        })
        return;
        /*支付测试 */

 

回调url:notify.php

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数  
if (empty($postXml)) {  
    return false;  
}  
  
//将xml格式转换成数组  
function xmlToArray($xml) {  
  
    //禁止引用外部xml实体   
    libxml_disable_entity_loader(true);  
  
    $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);  
  
    $val = json_decode(json_encode($xmlstring), true);  
  
    return $val;  
}  
  
$attr = xmlToArray($postXml);  
  
$total_fee = $attr[total_fee];  
$open_id = $attr[openid];  
$out_trade_no = $attr[out_trade_no];  
$time = $attr[time_end];