ThinkPHP5微信小程序支付

做支付必须要满足以下条件

  1. appid:绑定支付的APPID(必须配置,开户邮件中可查看)
  2. mch_id:商户号(必须配置,开户邮件中可查看)
  3. key:商户支付密钥,参考开户邮件设置(必须配置,登录商户平台自行设置)设置地址:https://pay.weixin.qq.com/index.php/account/api_cert
  4. 有订单表而且必须有,订单编号(唯一的),支付金额,支付状态。这些字段,才能走完支付整个流程。

表Demo

DROP TABLE IF EXISTS `order`;
CREATE TABLE `order` (
  `id` int(30) NOT NULL AUTO_INCREMENT COMMENT '订单ID',
  `uid` int(30) DEFAULT NULL COMMENT '用户ID',
  `price` decimal(10,2) DEFAULT NULL COMMENT '金额',
  `order_sn` varchar(255) DEFAULT NULL COMMENT '订单编号',
  `status` int(2) DEFAULT '0' COMMENT '状态,0未付款,1已付款',
  `transaction_id` varchar(255) DEFAULT NULL COMMENT '微信支付流水号',
  `create_time` varchar(255) DEFAULT NULL,
  `update_time` varchar(255) DEFAULT NULL,
  `delete_time` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=34 DEFAULT CHARSET=utf8 COMMENT='订单表';

发起支付

<?php
/**
 * Pasa吴
 * 2019年2月9日12:10:04
 */
namespace app\common_ext\logic;
//微信支付工具类
use app\tools\WeChatPay;

class Order extends LogicBase
{
    /*
     * 发起支付
     */
    public function pay()
    {
        $appid      = '你的appid';
        $mch_id     = '你的mch_id';
        $notify_url = 'www.baidu.com/api/v1/order/notify'; //支付回调地址
        $key        = '你的key';
        $openid     = "用户openid";
        $WeChatPay  = new WeChatPay($appid, $mch_id, $notify_url, $key, $openid);

        $params['body']         = '买代码'; //商品描述
        $params['out_trade_no'] = $order_sn; //自定义的订单号 time()."-".$openid
        $params['total_fee']    = $amount * 100; //订单金额 只能为整数 单位为分
        $params['trade_type']   = 'JSAPI'; //交易类型 JSAPI | NATIVE | APP | WAP

        $result = $WeChatPay->unifiedOrder($params);
        return [SUCCESS, '获取支付参数成功!', $result];
    }
}

微信支付回调

<?php
/**
 * Pasa吴
 * 2019年2月9日12:10:04
 */
namespace app\common_ext\logic;
//微信支付工具类
use app\tools\WeChatPay;

class Order extends LogicBase
{
    /*
     * 微信支付回调接口
     */
    public function notify()
    {
        $appid      = '你的appid';
        $mch_id     = '你的mch_id';
        $notify_url = '';
        $key        = '你的key';
        $WeChatPay  = new WeChatPay($appid, $mch_id, $notify_url, $key,'');

        //获取支付结果通知数据 并且将xml转为array
        $data = $WeChatPay->getNotifyData();

        // 保存微信服务器返回的签名sign
        $data_sign = $data['sign'];
        // sign不参与签名算法
        unset($data['sign']);
        //生成签名
        $sign = $WeChatPay->MakeSign($data);
        /*  微信官方提醒:
         *  商户系统对于支付结果通知的内容一定要做【签名验证】,
         *  并校验返回的【订单金额是否与商户侧的订单金额】一致,
         *  防止数据泄漏导致出现“假通知”,造成资金损失。
         */
        // 判断签名是否正确  判断支付状态
        if (($sign === $data_sign) && ($data['return_code'] == 'SUCCESS') && ($data['result_code'] == 'SUCCESS')) {
            //获取服务器返回的数据
            $order_sn       = $data['out_trade_no'];          //订单单号
            $transaction_id = $data['transaction_id'];  //微信支付流水号
            //这里根据项目需求来写你的操作 如更新订单状态等信息 更新成功返回'success'即可
            $order = Order::where('order_sn',$order_sn)->find();
            if (!$order) {
                //订单不存在
                // $str = '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[签名失败]]></return_msg></xml>';
                //通知微信接收通知成功
                return $WeChatPay->replyNotify();
            }
            if ($order['status'] == 1) {
                //通知微信接收通知成功
                return $WeChatPay->replyNotify();
            }
            //订单状态更新
            $order->save(['status' => 1, 'transaction_id' => $transaction_id]);//保存流水号
            //通知微信接收通知成功
            return $WeChatPay->replyNotify();

        }
    }
}

微信支付工具类微信支付工具类

文件路径application/tools/WeChatPay.php
<?php
/**
 * 微信支付工具类
 * Pasa吴
 * 2019年2月9日09:52:56
 */

namespace app\tools;

use think\Controller;

class WeChatPay extends Controller
{
    //接口API URL前缀
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
    //下单地址URL
    const UNIFIEDORDER_URL = "/pay/unifiedorder";
    //查询订单URL
    const ORDERQUERY_URL = "/pay/orderquery";
    //关闭订单URL
    const CLOSEORDER_URL = "/pay/closeorder";
    //公众账号ID
    private $appid;
    //商户号
    private $mch_id;
    //随机字符串
    private $nonce_str;
    //签名
    private $sign;
    //商品描述
    private $body;
    //商户订单号
    private $out_trade_no;
    //支付总金额
    private $total_fee;
    //终端IP
    private $spbill_create_ip;
    //支付结果回调通知地址
    private $notify_url;
    //交易类型
    private $trade_type;
    //支付密钥
    private $key;
    //证书路径
    private $SSLCERT_PATH;
    private $SSLKEY_PATH;

    private $openid;

    //所有参数
    private $params = array();

    public function __construct($appid, $mch_id, $notify_url, $key, $openid)
    {
        $this->appid      = trim($appid);
        $this->mch_id     = trim($mch_id);
        $this->notify_url = trim($notify_url);
        $this->key        = trim($key);
        $this->openid     = trim($openid);
    }

    /**
     * 生成支付参数
     * @param $prepay_id
     * @return mixed
     */
    public function SplicingParam($prepay_id)
    {
        $data['timeStamp']    = $this->getMillisecond();
        $data['nonceStr']     = $this->nonce_str;
        $data['package']      = $prepay_id;//没加prepay_id= 之前加签名
        $data['out_trade_no'] = $this->out_trade_no;//订单编号
        $data['paySign']      = strtoupper(md5("appId=" . $this->appid . "&nonceStr=" . $this->nonce_str . "&package=prepay_id=" . $prepay_id . "&signType=MD5&timeStamp=" . $this->getMillisecond() . "&key=" . $this->key));
        $data['package']      = "prepay_id=" . $prepay_id;//加签名后 加上prepay_id=
        return $data;
    }

    /**
     * 下单方法
     * @param $params 下单参数
     */
    public function unifiedOrder($params)
    {
        $this->body                       = $params['body'];
        $this->out_trade_no               = $params['out_trade_no'];
        $this->total_fee                  = $params['total_fee'];
        $this->trade_type                 = $params['trade_type'];
        $this->nonce_str                  = $this->genRandomString();
        $this->spbill_create_ip           = $_SERVER['REMOTE_ADDR'];
        $this->params['appid']            = $this->appid;
        $this->params['mch_id']           = $this->mch_id;
        $this->params['nonce_str']        = $this->nonce_str;
        $this->params['body']             = $this->body;
        $this->params['out_trade_no']     = $this->out_trade_no;
        $this->params['total_fee']        = $this->total_fee;
        $this->params['total_fee']        = 1;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url']       = $this->notify_url;
        $this->params['trade_type']       = $this->trade_type;
        $this->params['openid']           = $this->openid;
        //$this->params['attach'] = '支付测试';

        //获取签名数据
        $this->sign = $this->MakeSign($this->params);

        $this->params['sign'] = $this->sign;
        $xml                  = $this->data_to_xml($this->params);

        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::UNIFIEDORDER_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (!empty($result['result_code']) && !empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        //return $result;
        return $this->SplicingParam($result['prepay_id']);
    }

    /**
     * 查询订单信息
     * @param $out_trade_no 订单号
     * @return array
     */
    public function orderQuery($out_trade_no)
    {
        $this->params['appid']        = $this->appid;
        $this->params['mch_id']       = $this->mch_id;
        $this->params['nonce_str']    = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign           = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml                  = $this->data_to_xml($this->params);
        $response             = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::ORDERQUERY_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (!empty($result['result_code']) && !empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 关闭订单
     * @param $out_trade_no 订单号
     * @return array
     */
    public function closeOrder($out_trade_no)
    {
        $this->params['appid']        = $this->appid;
        $this->params['mch_id']       = $this->mch_id;
        $this->params['nonce_str']    = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        //获取签名数据
        $this->sign           = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml                  = $this->data_to_xml($this->params);
        $response             = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::CLOSEORDER_URL);
        if (!$response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        return $result;
    }

    /**
     *
     * 获取支付结果通知数据
     * return array
     */
    public function getNotifyData()
    {
        //获取通知的数据
        $xml = file_get_contents("php://input");
        //$xml  = $GLOBALS['HTTP_RAW_POST_DATA'];
        $data = array();
        if (empty($xml)) {
            return false;
        }
        $data = $this->xml_to_data($xml);
        if (!empty($data['return_code'])) {
            if ($data['return_code'] == 'FAIL') {
                return false;
            }
        }
        return $data;
    }

    /**
     * 接收通知成功后应答输出XML数据
     * @param string $xml
     */
    public function replyNotify()
    {
        $data['return_code'] = 'SUCCESS';
        $data['return_msg']  = 'OK';
        $xml                 = $this->data_to_xml($data);
        echo $xml;
        die();
    }

    /**
     * 生成APP端支付参数
     * @param $prepayid 预支付id
     */
    public function getAppPayParams($prepayid)
    {
        $data['appid']     = $this->appid;
        $data['partnerid'] = $this->mch_id;
        $data['prepayid']  = $prepayid;
        $data['package']   = 'Sign=WXPay';
        $data['noncestr']  = $this->genRandomString();
        $data['timestamp'] = time();
        $data['sign']      = $this->MakeSign($data);
        return $data;
    }

    /**
     * 生成签名
     * @return 签名
     */
    public function MakeSign($params)
    {
        //签名步骤一:按字典序排序数组参数
        ksort($params);
        $string = $this->ToUrlParams($params);
        //签名步骤二:在string后加入KEY
        //$string = "openid=".$this->openid."&".$string . "&key=".$this->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;
    }

    /**
     * 将参数拼接为url: key=value&key=value
     * @param $params
     * @return string
     */
    public function ToUrlParams($params)
    {
        $string = '';
        if (!empty($params)) {
            $array = array();
            foreach ($params as $key => $value) {
                $array[] = $key . '=' . $value;
            }
            $string = implode("&", $array);
        }
        return $string;
    }

    /**
     * 输出xml字符
     * @param $params 参数名称
     * return string 返回组装的xml
     **/
    public function data_to_xml($params)
    {
        if (!is_array($params) || count($params) <= 0) {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
            }
        }
        $xml .= "</xml>";

        return $xml;
    }

    /**
     * 将xml转为array
     * @param string $xml
     * return array
     */
    public function xml_to_data($xml)
    {
        if (!$xml) {
            return false;
        }
        //将XML转为array
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }

    /**
     * 获取毫秒级别的时间戳
     */
    private static function getMillisecond()
    {
        //获取毫秒的时间戳
        $time  = explode(" ", microtime());
        $time  = $time[1] . ($time[0] * 1000);
        $time2 = explode(".", $time);
        $time  = $time2[0];
        return $time;
    }

    /**
     * 产生一个指定长度的随机字符串,并返回给用户
     * @param type $len 产生字符串的长度
     * @return string 随机字符串
     */
    private function genRandomString($len = 32)
    {
        $chars    = array(
            "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
            "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
            "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
            "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
            "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
            "3", "4", "5", "6", "7", "8", "9"
        );
        $charsLen = count($chars) - 1;
        // 将数组打乱
        shuffle($chars);
        $output = "";
        for ($i = 0; $i < $len; $i++) {
            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;
    }

    /**
     * 以post方式提交xml到对应的接口url
     *
     * @param string $xml 需要post的xml数据
     * @param string $url url
     * @param bool $useCert 是否需要证书,默认不需要
     * @param int $second url执行超时时间,默认30s
     * @throws WxPayException
     */
    private function postXmlCurl($xml, $url, $useCert = false, $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($ch, CURLOPT_SSL_VERIFYHOST, 2);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if ($useCert == true) {
            //设置证书
            //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, WxPayConfig::SSLCERT_PATH);
            curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
            //curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
        }
        //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);
            curl_close($ch);
            return false;
        }
    }

    public function getNonceStr()
    {
        return $this->nonce_str;
    }

    public function getIp()
    {
        return $this->spbill_create_ip;
    }


    /**
     * 错误代码
     * @param $code 服务器输出的错误代码
     * return string
     */
    public function error_code($code)
    {
        $errList = array(
            'NOAUTH'                => '商户未开通此接口权限',
            'NOTENOUGH'             => '用户帐号余额不足',
            'ORDERNOTEXIST'         => '订单号不存在',
            'ORDERPAID'             => '商户订单已支付,无需重复操作',
            'ORDERCLOSED'           => '当前订单已关闭,无法支付',
            'SYSTEMERROR'           => '系统错误!系统超时',
            'APPID_NOT_EXIST'       => '参数中缺少APPID',
            'MCHID_NOT_EXIST'       => '参数中缺少MCHID',
            'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',
            'LACK_PARAMS'           => '缺少必要的请求参数',
            'OUT_TRADE_NO_USED'     => '同一笔交易不能多次提交',
            'SIGNERROR'             => '参数签名结果不正确',
            'XML_FORMAT_ERROR'      => 'XML格式错误',
            'REQUIRE_POST_METHOD'   => '未使用post传递参数 ',
            'POST_DATA_EMPTY'       => 'post数据不能为空',
            'NOT_UTF8'              => '未使用指定编码格式',
        );
        if (array_key_exists($code, $errList)) {
            return $errList[$code];
        }
    }

}

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