微信 之jsapi实现支付

一、微信公众号号后台支付配置

附微信支付参考文档：https://pay.weixin.qq.com/wiki/doc/api/index.html

二、微信支付类封装

该类可以实现付款码支付、JSAPI支付、Native支付

<?php

/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/2/16 0016
 * Time: 下午 4:04
 */
class Wxpay
{
    const TRADETYPE_JSAPI = 'JSAPI', TRADETYPE_NATIVE = 'NATIVE', TRADETYPE_APP = 'APP';
    const URL_UNIFIEDORDER = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    const URL_ORDERQUERY = "https://api.mch.weixin.qq.com/pay/orderquery";
    const URL_CLOSEORDER = 'https://api.mch.weixin.qq.com/pay/closeorder';
    const URL_REFUND = 'https://api.mch.weixin.qq.com/secapi/pay/refund';
    const URL_REFUNDQUERY = 'https://api.mch.weixin.qq.com/pay/refundquery';
    const URL_DOWNLOADBILL = 'https://api.mch.weixin.qq.com/pay/downloadbill';
    const URL_REPORT = 'https://api.mch.weixin.qq.com/payitil/report';
    const URL_SHORTURL = 'https://api.mch.weixin.qq.com/tools/shorturl';
    const URL_MICROPAY = 'https://api.mch.weixin.qq.com/pay/micropay';
    /**
     * 错误信息
     */
    public $error = null;
    /**
     * 错误信息XML
     */
    public $errorXML = null;
    /**
     * 微信支付配置数组
     * appid        公众账号appid
     * mch_id       商户号
     * apikey       加密key
     * appsecret    公众号appsecret
     * sslcertPath  证书路径(apiclient_cert.pem)
     * sslkeyPath   密钥路径(apiclient_key.pem)
     */
    private $_config;

    /**
     * @param $config 微信支付配置数组
     */
    public function __construct($config)
    {
        $this->_config = $config;
    }

    /**
     * JSAPI获取prepay_id
     * @param $body
     * @param $out_trade_no
     * @param $total_fee
     * @param $notify_url
     * @param $openid
     * @return null
     */
    public function getPrepayId($body, $out_trade_no, $total_fee, $notify_url, $openid)
    {
        $data = array();
        $data["nonce_str"] = $this->get_nonce_string();
        $data["body"] = $body;
        $data["out_trade_no"] = $out_trade_no;
        $data["total_fee"] = $total_fee;
        $data["spbill_create_ip"] = $_SERVER["REMOTE_ADDR"];
        $data["notify_url"] = $notify_url;
        $data["trade_type"] = self::TRADETYPE_JSAPI;
        $data["openid"] = $openid;
        $result = $this->unifiedOrder($data);
        if ($result["return_code"] == "SUCCESS" && $result["result_code"] == "SUCCESS") {
            return $result["prepay_id"];
        } else {
            $this->error = $result["return_code"] == "SUCCESS" ? $result["err_code_des"] : $result["return_msg"];
            $this->errorXML = $this->array2xml($result);
            return null;
        }
    }

    private function get_nonce_string()
    {
        return substr(str_shuffle("abcdefghijklmnopqrstuvwxyz0123456789"), 0, 32);
    }

    /**
     * 统一下单接口
     */
    public function unifiedOrder($params)
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["device_info"] = (isset($params['device_info']) && trim($params['device_info']) != '') ? $params['device_info'] : null;
        $data["nonce_str"] = $this->get_nonce_string();
        $data["body"] = $params['body'];
        $data["detail"] = isset($params['detail']) ? $params['detail'] : null;//optional
        $data["attach"] = isset($params['attach']) ? $params['attach'] : null;//optional
        $data["out_trade_no"] = isset($params['out_trade_no']) ? $params['out_trade_no'] : null;
        $data["fee_type"] = isset($params['fee_type']) ? $params['fee_type'] : 'CNY';
        $data["total_fee"] = $params['total_fee'];
        $data["spbill_create_ip"] = $params['spbill_create_ip'];
        $data["time_start"] = isset($params['time_start']) ? $params['time_start'] : null;//optional
        $data["time_expire"] = isset($params['time_expire']) ? $params['time_expire'] : null;//optional
        $data["goods_tag"] = isset($params['goods_tag']) ? $params['goods_tag'] : null;
        $data["notify_url"] = $params['notify_url'];
        $data["trade_type"] = $params['trade_type'];
        $data["product_id"] = isset($params['product_id']) ? $params['product_id'] : null;//required when trade_type = NATIVE
        $data["openid"] = isset($params['openid']) ? $params['openid'] : null;//required when trade_type = JSAPI
        $result = $this->post(self::URL_UNIFIEDORDER, $data);
        return $result;
    }

    private function post($url, $data, $cert = false)
    {
        $data["sign"] = $this->sign($data);
        $xml = $this->array2xml($data);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_URL, $url);
        if ($cert == true) {
            //使用证书：cert 与 key 分别属于两个.pem文件
            curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
            curl_setopt($ch, CURLOPT_SSLCERT, $this->_config['sslcertPath']);
            curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
            curl_setopt($ch, CURLOPT_SSLKEY, $this->_config['sslkeyPath']);
        }
        $content = curl_exec($ch);
        $array = $this->xml2array($content);
        return $array;
    }

    /**
     * 数据签名
     * @param $data
     * @return string
     */
    private function sign($data)
    {
        ksort($data);
        $string1 = "";
        foreach ($data as $k => $v) {
            if ($v && trim($v) != '') {
                $string1 .= "$k=$v&";
            }
        }
        $stringSignTemp = $string1 . "key=" . $this->_config["apikey"];
        $sign = strtoupper(md5($stringSignTemp));
        return $sign;
    }

    private function array2xml($array)
    {
        $xml = "<xml>" . PHP_EOL;
        foreach ($array as $k => $v) {
            if ($v && trim($v) != '')
                $xml .= "<$k><![CDATA[$v]]></$k>" . PHP_EOL;
        }
        $xml .= "</xml>";
        return $xml;
    }

    private function xml2array($xml)
    {
        $array = array();
        $tmp = null;
        try {
            $tmp = (array)simplexml_load_string($xml);
        } catch (Exception $e) {
        }
        if ($tmp && is_array($tmp)) {
            foreach ($tmp as $k => $v) {
                $array[$k] = (string)$v;
            }
        }
        return $array;
    }

    /**
     * 扫码支付(模式二)获取支付二维码
     * @param $body
     * @param $out_trade_no
     * @param $total_fee
     * @param $notify_url
     * @param $product_id
     * @return null
     */
    public function getCodeUrl($body, $out_trade_no, $total_fee, $notify_url, $product_id)
    {
        $data = array();
        $data["nonce_str"] = $this->get_nonce_string();
        $data["body"] = $body;
        $data["out_trade_no"] = $out_trade_no;
        $data["total_fee"] = $total_fee;
        $data["spbill_create_ip"] = $_SERVER["SERVER_ADDR"];
        $data["notify_url"] = $notify_url;
        $data["trade_type"] = self::TRADETYPE_NATIVE;
        $data["product_id"] = $product_id;
        $result = $this->unifiedOrder($data);
        if ($result["return_code"] == "SUCCESS" && $result["result_code"] == "SUCCESS") {
            return $result["code_url"];
        } else {
            $this->error = $result["return_code"] == "SUCCESS" ? $result["err_code_des"] : $result["return_msg"];
            return null;
        }
    }

    /**
     * 查询订单
     * @param $transaction_id
     * @param $out_trade_no
     * @return array
     */
    public function orderQuery($transaction_id, $out_trade_no)
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["transaction_id"] = $transaction_id;
        $data["out_trade_no"] = $out_trade_no;
        $data["nonce_str"] = $this->get_nonce_string();
        $result = $this->post(self::URL_ORDERQUERY, $data);
        return $result;
    }

    /**
     * 关闭订单
     * @param $out_trade_no
     * @return array
     */
    public function closeOrder($out_trade_no)
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["out_trade_no"] = $out_trade_no;
        $data["nonce_str"] = $this->get_nonce_string();
        $result = $this->post(self::URL_CLOSEORDER, $data);
        return $result;
    }

    /**
     * 申请退款 - 使用商户订单号
     * @param $out_trade_no 商户订单号
     * @param $out_refund_no 退款单号
     * @param $total_fee 总金额（单位：分）
     * @param $refund_fee 退款金额（单位：分）
     * @param $op_user_id 操作员账号
     * @return array
     */
    public function refund($out_trade_no, $out_refund_no, $total_fee, $refund_fee, $op_user_id)
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["nonce_str"] = $this->get_nonce_string();
        $data["out_trade_no"] = $out_trade_no;
        $data["out_refund_no"] = $out_refund_no;
        $data["total_fee"] = $total_fee;
        $data["refund_fee"] = $refund_fee;
        $data["op_user_id"] = $op_user_id;
        $result = $this->post(self::URL_REFUND, $data, true);
        return $result;
    }

    /**
     * 申请退款 - 使用微信订单号
     * @param $out_trade_no 商户订单号
     * @param $out_refund_no 退款单号
     * @param $total_fee 总金额（单位：分）
     * @param $refund_fee 退款金额（单位：分）
     * @param $op_user_id 操作员账号
     * @return array
     */
    public function refundByTransId($transaction_id, $out_refund_no, $total_fee, $refund_fee, $op_user_id)
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["nonce_str"] = $this->get_nonce_string();
        $data["transaction_id"] = $transaction_id;
        $data["out_refund_no"] = $out_refund_no;
        $data["total_fee"] = $total_fee;
        $data["refund_fee"] = $refund_fee;
        $data["op_user_id"] = $op_user_id;
        $result = $this->post(self::URL_REFUND, $data, true);
        return $result;
    }

    /**
     * 下载对账单
     * @param $bill_date 下载对账单的日期，格式：20140603
     * @param $bill_type 类型
     * @return array
     */
    public function downloadBill($bill_date, $bill_type = 'ALL')
    {
        $data = array();
        $data["appid"] = $this->_config["appid"];
        $data["mch_id"] = $this->_config["mch_id"];
        $data["bill_date"] = $bill_date;
        $data["bill_type"] = $bill_type;
        $data["nonce_str"] = $this->get_nonce_string();
        $result = $this->post(self::URL_DOWNLOADBILL, $data);
        return $result;
    }

    /**
     * 获取js支付使用的第二个参数
     */
    public function get_package($prepay_id)
    {
        $data = array();
        $data["appId"] = $this->_config["appid"];
        $data["timeStamp"] = time();
        $data["nonceStr"] = $this->get_nonce_string();
        $data["package"] = "prepay_id=$prepay_id";
        $data["signType"] = "MD5";
        $data["paySign"] = $this->sign($data);
        return $data;
    }

    /**
     * 获取发送到通知地址的数据(在通知地址内使用)
     * @return 结果数组，如果不是微信服务器发送的数据返回null
     *          appid
     *          bank_type
     *          cash_fee
     *          fee_type
     *          is_subscribe
     *          mch_id
     *          nonce_str
     *          openid
     *          out_trade_no    商户订单号
     *          result_code
     *          return_code
     *          sign
     *          time_end
     *          total_fee       总金额
     *          trade_type
     *          transaction_id  微信支付订单号
     */
    public function get_back_data()
    {
        $xml = file_get_contents("php://input");
        $data = $this->xml2array($xml);
        if ($this->validate($data)) {
            return $data;
        } else {
            return null;
        }
    }

    /**
     * 验证数据签名
     * @param $data 数据数组
     * @return 数据校验结果
     */
    public function validate($data)
    {
        if (!isset($data["sign"])) {
            return false;
        }
        $sign = $data["sign"];
        unset($data["sign"]);
        return $this->sign($data) == $sign;
    }

    /**
     * 响应微信支付后台通知
     * @param $return_code 返回状态码 SUCCESS/FAIL
     * @param $return_msg  返回信息
     */
    public function response_back($return_code = "SUCCESS", $return_msg = null)
    {
        $data = array();
        $data["return_code"] = $return_code;
        if ($return_msg) {
            $data["return_msg"] = $return_msg;
        }
        $xml = $this->array2xml($data);
        print $xml;
    }
}

先调用getPrepayId方法，后再调用get_package方法，返回的参数传给前台。

三、前台js代码

function onBridgeReady(){
   WeixinJSBridge.invoke(
      'getBrandWCPayRequest', {
         "appId":"wx2421b1c4370ec43b",     //公众号名称，由商户传入     
         "timeStamp":"1395712654",         //时间戳，自1970年以来的秒数     
         "nonceStr":"e61463f8efa94090b1f366cccfbbb444", //随机串     
         "package":"prepay_id=u802345jgfjsdfgsdg888",     
         "signType":"MD5",         //微信签名方式：     
         "paySign":"70EA570631E4BB79628FBCA90534C63FF7FADD89" //微信签名 
      },
      function(res){
      if(res.err_msg == "get_brand_wcpay_request:ok" ){
      // 使用以上方式判断前端返回,微信团队郑重提示：
            //res.err_msg将在用户支付成功后返回ok，但并不保证它绝对可靠。
      } 
   }); 
}
if (typeof WeixinJSBridge == "undefined"){
   if( document.addEventListener ){
       document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
   }else if (document.attachEvent){
       document.attachEvent('WeixinJSBridgeReady', onBridgeReady); 
       document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
   }
}else{
   onBridgeReady();
}