随着微信支付的升级，PHP微信支付类V3接口也来了

                                                                               

不知不觉微信支付也更新了，接口版本也升级到了V3,跟着微信的升级，将个人使用微信支付类也进行了升级，V3微信支付文档：https://pay.weixin.qq.com/wiki/doc/apiv3/index.shtml。

使用方法还和之前的一样（V2微信支付），直接传递参数就可使用：

新版新增了composer安装，便于集成框架使用（Github地址）：

composer require fengkui/pay

首先把配置文件填写完整（细心不要填错，否则会导致签名错误）：

# 微信支付配置
$wechatConfig = [
    'xcxid'         => '', // 小程序 appid
    'appid'         => '', // 微信支付 appid
    'mchid'         => '', // 微信支付 mch_id 商户收款账号
    'key'           => '', // 微信支付 apiV3key（尽量包含大小写字母，否则验签不通过）
    'appsecret'     => '', // 公众帐号 secert (公众号支付获取 code 和 openid 使用)

    'notify_url'    => '', // 接收支付状态的连接  改成自己的回调地址
    'redirect_url'  => '', // 公众号支付，调起支付页面

    'serial_no'     => '', // 证书序列号
    'cert_client'   => './cert/apiclient_cert.pem', // 证书（退款，红包时使用）
    'cert_key'      => './cert/apiclient_key.pem', // 商户私钥（Api安全中下载）
    'public_key'    => './cert/public_key.pem', // 平台公钥（调动证书列表，自动生成）
];

支付类封装相关方法：

method	描述
js	JSAPI下单
app	APP支付
h5	H5支付
scan	Navicat支付
xcx	小程序支付
query	查询订单
close	关闭订单
refund	申请退款
notify	支付结果通知

使用方法（这里已小程序支付为示例）：

<?php
require_once(&#39;./vendor/autoload.php&#39;);

$config = []; // 支付配置
$order = [
    &#39;order_sn&#39; => time(), // 订单编号
    &#39;total_amount&#39; => 1, // 订单金额（分）
    &#39;body&#39; => &#39;测试商品&#39;, // 商品名称
    &#39;openid&#39; => &#39;&#39;, // 用户openid
    // &#39;type&#39; => &#39;Wap&#39;,
];

$wechat = new fengkui\Pay\Wechat($config);
$re = $wechat->xcx($order);
die(json_encode($re)); // JSON化直接返回小程序客户端

如下代码是封装好的完整支付类文件（Wechat.php），
可以根据自己需求随意修改，详细的使用方法后期会有文档：

<?php
/**
 * @Author: [FENG] <1161634940@qq.com>
 * @Date:   2019-09-06 09:50:30
 * @Last Modified by:   [FENG] <1161634940@qq.com>
 * @Last Modified time: 2021-07-12 18:24:18
 */
namespace fengkui\Pay;

use Exception;
use RuntimeException;
use fengkui\Supports\Http;

/**
 * Wechat 微信支付
 * 新版（V3）接口（更新中）
 */
class Wechat
{
    const AUTH_TAG_LENGTH_BYTE = 16;

    // 新版相关接口
    // GET 获取平台证书列表
    private static $certificatesUrl = &#39;https://api.mch.weixin.qq.com/v3/certificates&#39;;
    // 统一下订单管理
    private static $transactionsUrl = &#39;https://api.mch.weixin.qq.com/v3/pay/transactions/&#39;;
    // 申请退款
    private static $refundUrl = &#39;https://api.mch.weixin.qq.com/v3/refund/domestic/refunds&#39;;
    // 静默授权，获取code
    private static $authorizeUrl = &#39;https://open.weixin.qq.com/connect/oauth2/authorize&#39;;
    // 通过code获取access_token以及openid
    private static $accessTokenUrl = &#39;https://api.weixin.qq.com/sns/oauth2/access_token&#39;;

    // 支付完整配置
    private static $config = array(
        &#39;xcxid&#39;         => &#39;&#39;, // 小程序appid
        &#39;appid&#39;         => &#39;&#39;, // 微信支付appid
        &#39;mchid&#39;         => &#39;&#39;, // 微信支付 mch_id 商户收款账号
        &#39;key&#39;           => &#39;&#39;, // 微信支付 apiV3key（尽量包含大小写字母，否则验签不通过）
        &#39;appsecret&#39;     => &#39;&#39;, // 公众帐号 secert (公众号支付获取code 和 openid使用)

        &#39;notify_url&#39;    => &#39;&#39;, // 接收支付状态的连接  改成自己的回调地址
        &#39;redirect_url&#39;  => &#39;&#39;, // 公众号支付，调起支付页面

        &#39;serial_no&#39;     => &#39;&#39;, // 证书序列号
        &#39;cert_client&#39;   => &#39;./cert/apiclient_cert.pem&#39;, // 证书（退款，红包时使用）
        &#39;cert_key&#39;      => &#39;./cert/apiclient_key.pem&#39;, // 商户私钥（Api安全中下载）
        &#39;public_key&#39;    => &#39;./cert/public_key.pem&#39;, // 平台公钥（调动证书列表，自动生成）
    );

    /**
     * [__construct 构造函数]
     * @param [type] $config [传递微信支付相关配置]
     */
    public function __construct($config=NULL, $referer=NULL){
        $config && self::$config = array_merge(self::$config, $config);
    }

    /**
     * [unifiedOrder 统一下单]
     * @param  [type]  $order [订单信息（必须包含支付所需要的参数）]
     * @param  boolean $type  [区分是否是小程序，是则传 true]
     * @return [type]         [description]
     * $order = array(
     *      &#39;body&#39;         => &#39;&#39;, // 产品描述
     *      &#39;order_sn&#39;     => &#39;&#39;, // 订单编号
     *      &#39;total_amount&#39; => &#39;&#39;, // 订单金额（分）
     * );
     */
    public static function unifiedOrder($order, $type=false)
    {
        $config = array_filter(self::$config);

        // 获取配置项
        $params = array(
            &#39;appid&#39;         => $type ? $config[&#39;xcxid&#39;] : $config[&#39;appid&#39;], // 由微信生成的应用ID
            &#39;mchid&#39;         => $config[&#39;mchid&#39;], // 直连商户的商户号
            &#39;description&#39;   => $order[&#39;body&#39;], // 商品描述
            &#39;out_trade_no&#39;  => (string)$order[&#39;order_sn&#39;], // 商户系统内部订单号
            &#39;notify_url&#39;    => $config[&#39;notify_url&#39;], // 通知URL必须为直接可访问的URL
            &#39;amount&#39;        => [&#39;total&#39; => (int)$order[&#39;total_amount&#39;], &#39;currency&#39; => &#39;CNY&#39;], // 订单金额信息
        );

        !empty($order[&#39;attach&#39;]) && $params[&#39;attach&#39;] = $order[&#39;attach&#39;]; // 附加数据
        if (!empty($order[&#39;time_expire&#39;])) { // 订单失效时间
            preg_match(&#39;/[年\/-]/&#39;, $order[&#39;time_expire&#39;]) && $order[&#39;time_expire&#39;] = strtotime($order[&#39;time_expire&#39;]);
            $time = $order[&#39;time_expire&#39;] > time() ? $order[&#39;time_expire&#39;] : $order[&#39;time_expire&#39;] + time();
            $params[&#39;time_expire&#39;] = date(DATE_ATOM, $time);
        }

        if (!in_array($order[&#39;type&#39;], [&#39;native&#39;])) {
            !empty($order[&#39;openid&#39;]) && $params[&#39;payer&#39;] = [&#39;openid&#39; => $order[&#39;openid&#39;]];
            $params[&#39;scene_info&#39;] = [&#39;payer_client_ip&#39; => self::get_ip()];
        }

        if (in_array($order[&#39;type&#39;], [&#39;iOS&#39;, &#39;Android&#39;, &#39;Wap&#39;])) {
            $params[&#39;scene_info&#39;][&#39;h5_info&#39;] = [&#39;type&#39; => $order[&#39;type&#39;]];
            $url = self::$transactionsUrl . &#39;h5&#39;; // 拼接请求地址
        } else {
            $url = self::$transactionsUrl . strtolower($order[&#39;type&#39;]); // 拼接请求地址
        }

        $header = self::createAuthorization($url, $params, &#39;POST&#39;);
        $response = Http::post($url, json_encode($params, JSON_UNESCAPED_UNICODE), $header);
        $result = json_decode($response, true);
        if (isset($result[&#39;code&#39;]) && isset($result[&#39;message&#39;])) {
            throw new \Exception("[" . $result[&#39;code&#39;] . "] " . $result[&#39;message&#39;]);
        }

        return $result;
    }

    /**
     * [query 查询订单]
     * @param  [type]  $orderSn [订单编号]
     * @param  boolean $type    [微信支付订单编号，是否是微信支付订单号]
     * @return [type]           [description]
     */
    public static function query($orderSn, $type = false)
    {
        $config = self::$config;
        $url = self::$transactionsUrl . ($type ? &#39;id/&#39; : &#39;out-trade-no/&#39;) . $orderSn . &#39;?mchid=&#39; . $config[&#39;mchid&#39;];
        $params = &#39;&#39;;

        $header = self::createAuthorization($url, $params, &#39;GET&#39;);
        $response = Http::get($url, $params, $header);
        $result = json_decode($response, true);

        return $result;
    }

    /**
     * [close 关闭订单]
     * @param  [type] $orderSn [微信支付订单编号]
     * @return [type]          [description]
     */
    public static function close($orderSn)
    {
        $config = self::$config;
        $url = self::$transactionsUrl . &#39;out-trade-no/&#39; . $orderSn . &#39;/close&#39;;
        $params[&#39;mchid&#39;] = $config[&#39;mchid&#39;];

        $header = self::createAuthorization($url, $params, &#39;POST&#39;);
        $response = Http::post($url, json_encode($params, JSON_UNESCAPED_UNICODE), $header);
        $result = json_decode($response, true);

        return true;
    }

    /**
     * [js 获取jssdk需要用到的数据]
     * @param  [type] $order [订单信息数组]
     * @return [type]        [description]
     */
    public static function js($order=[]){
        $config = self::$config;
        if (!is_array($order) || count($order) < 3)
            die("订单数组信息缺失！");
        if (count($order) == 4 && !empty($order[&#39;openid&#39;])) {
            $data = self::xcx($order, false, false); // 获取支付相关信息(获取非小程序信息)
            return $data;
        }
        $code = !empty($order[&#39;code&#39;]) ? $order[&#39;code&#39;] : ($_GET[&#39;code&#39;] ?? &#39;&#39;);
        $redirectUri = $_SERVER[&#39;REQUEST_SCHEME&#39;] . &#39;://&#39; . $_SERVER[&#39;HTTP_HOST&#39;] . rtrim($_SERVER[&#39;REQUEST_URI&#39;], &#39;/&#39;) . &#39;/&#39;; // 重定向地址

        $params = [&#39;appid&#39; => $config[&#39;appid&#39;]];
        // 如果没有get参数没有code；则重定向去获取code；
        if (empty($code)) {
            $params[&#39;redirect_uri&#39;] = $redirectUri; // 返回的url
            $params[&#39;response_type&#39;] = &#39;code&#39;;
            $params[&#39;scope&#39;] = &#39;snsapi_base&#39;;
            $params[&#39;state&#39;] = $order[&#39;order_sn&#39;]; // 获取订单号

            $url = self::$authorizeUrl . &#39;?&#39;. http_build_query($params) .&#39;#wechat_redirect&#39;;
        } else {
            $params[&#39;secret&#39;] = $config[&#39;appsecret&#39;];
            $params[&#39;code&#39;] = $code;
            $params[&#39;grant_type&#39;] = &#39;authorization_code&#39;;

            $response = Http::get(self::$accessTokenUrl, $params); // 进行GET请求
            $result = json_decode($response, true);

            $order[&#39;openid&#39;] = $result[&#39;openid&#39;]; // 获取到的openid
            $data = self::xcx($order, false, false); // 获取支付相关信息(获取非小程序信息)

            if (!empty($order[&#39;code&#39;])) {
                return $data;
            }

            $url = $config[&#39;redirect_url&#39;] ?? $redirectUri;
            $url .= &#39;?data=&#39; . json_encode($data, JSON_UNESCAPED_UNICODE);
        }
        header(&#39;Location: &#39;. $url);
        die;
    }

    /**
     * [app 获取APP支付需要用到的数据]
     * @param  [type]  $order [订单信息数组]
     * @return [type]         [description]
     */
    public static function app($order=[], $log=false)
    {
        if(empty($order[&#39;order_sn&#39;]) || empty($order[&#39;total_amount&#39;]) || empty($order[&#39;body&#39;])){
            die("订单数组信息缺失！");
        }

        $order[&#39;type&#39;] = &#39;app&#39;; // 获取订单类型，用户拼接请求地址
        $result = self::unifiedOrder($order, true);
        if (!empty($result[&#39;prepay_id&#39;])) {
            $data = array (
                &#39;appId&#39;     => self::$config[&#39;appid&#39;], // 微信开放平台审核通过的移动应用appid
                &#39;timeStamp&#39; => (string)time(),
                &#39;nonceStr&#39;  => self::get_rand_str(32, 0, 1), // 随机32位字符串
                &#39;prepayid&#39;  => $result[&#39;prepay_id&#39;],
            );
            $data[&#39;paySign&#39;] = self::makeSign($data);
            $data[&#39;partnerid&#39;] = $config[&#39;mchid&#39;];
            $data[&#39;package&#39;] = &#39;Sign=WXPay&#39;;
            return $data; // 数据小程序客户端
        } else {
            return $log ? $result : false;
        }
    }

    /**
     * [h5 微信H5支付]
     * @param  [type] $order [订单信息数组]
     * @return [type]        [description]
     */
    public static function h5($order=[], $log=false)
    {
        if(empty($order[&#39;order_sn&#39;]) || empty($order[&#39;total_amount&#39;]) || empty($order[&#39;body&#39;]) || empty($order[&#39;type&#39;]) || !in_array(strtolower($order[&#39;type&#39;]), [&#39;ios&#39;, &#39;android&#39;, &#39;wap&#39;])){
            die("订单数组信息缺失！");
        }
        $result = self::unifiedOrder($order);
        if (!empty($result[&#39;h5_url&#39;])) {
            return $result[&#39;h5_url&#39;]; // 返回链接让用户点击跳转
        } else {
            return $log ? $result : false;
        }
    }

    /**
     * [xcx 获取jssdk需要用到的数据]
     * @param  [type]  $order [订单信息数组]
     * @param  boolean $log   [description]
     * @param  boolean $type  [区分是否是小程序，默认 true]
     * @return [type]         [description]
     */
    public static function xcx($order=[], $log=false, $type=true)
    {
        if(empty($order[&#39;order_sn&#39;]) || empty($order[&#39;total_amount&#39;]) || empty($order[&#39;body&#39;]) || empty($order[&#39;openid&#39;])){
            die("订单数组信息缺失！");
        }

        $order[&#39;type&#39;] = &#39;jsapi&#39;; // 获取订单类型，用户拼接请求地址
        $config = self::$config;
        $result = self::unifiedOrder($order, $type);
        if (!empty($result[&#39;prepay_id&#39;])) {
            $data = array (
                &#39;appId&#39;     => $type ? $config[&#39;xcxid&#39;] : $config[&#39;appid&#39;], // 由微信生成的应用ID
                &#39;timeStamp&#39; => (string)time(),
                &#39;nonceStr&#39;  => self::get_rand_str(32, 0, 1), // 随机32位字符串
                &#39;package&#39;   => &#39;prepay_id=&#39;.$result[&#39;prepay_id&#39;],
            );
            $data[&#39;paySign&#39;] = self::makeSign($data);
            $data[&#39;signType&#39;] = &#39;RSA&#39;;
            return $data; // 数据小程序客户端
        } else {
            return $log ? $result : false;
        }
    }

    /**
     * [scan 微信扫码支付]
     * @param  [type] $order [订单信息数组]
     * @return [type]        [description]
     */
    public static function scan($order=[], $log=false)
    {
        if(empty($order[&#39;order_sn&#39;]) || empty($order[&#39;total_amount&#39;]) || empty($order[&#39;body&#39;])){
            die("订单数组信息缺失！");
        }
        $order[&#39;type&#39;] = &#39;native&#39;; // Native支付
        $result = self::unifiedOrder($order);

        if (!empty($result[&#39;code_url&#39;])) {
            return urldecode($result[&#39;code_url&#39;]); // 返回链接让用户点击跳转
        } else {
            return $log ? $result : false;
        }
    }

    /**
     * [notify 回调验证]
     * @return [array] [返回数组格式的notify数据]
     */
    public static function notify($server = [], $response = [])
    {
        $config = self::$config;
        $server = $server ?? $_SERVER;
        $response = $response ?? file_get_contents(&#39;php://input&#39;, &#39;r&#39;);
        if (empty($response) || empty($server[&#39;HTTP_WECHATPAY_SIGNATURE&#39;])) {
            return false;
        }
        $body = [
            &#39;timestamp&#39; => $server[&#39;HTTP_WECHATPAY_TIMESTAMP&#39;],
            &#39;nonce&#39; => $server[&#39;HTTP_WECHATPAY_NONCE&#39;],
            &#39;data&#39; => $response,
        ];
        // 验证应答签名
        $verifySign = self::verifySign($body, trim($server[&#39;HTTP_WECHATPAY_SIGNATURE&#39;]), trim($server[&#39;HTTP_WECHATPAY_SERIAL&#39;]));
        if (!$verifySign) {
            die("签名验证失败！");
        }
        $result = json_decode($response, true);
        if (empty($result) || $result[&#39;event_type&#39;] != &#39;TRANSACTION.SUCCESS&#39; || $result[&#39;summary&#39;] != &#39;支付成功&#39;) {
            return false;
        }
        // 加密信息
        $associatedData = $result[&#39;resource&#39;][&#39;associated_data&#39;];
        $nonceStr = $result[&#39;resource&#39;][&#39;nonce&#39;];
        $ciphertext = $result[&#39;resource&#39;][&#39;ciphertext&#39;];
        $data = $result[&#39;resource&#39;][&#39;ciphertext&#39;] = self::decryptToString($associatedData, $nonceStr, $ciphertext);

        return json_decode($data, true);
    }

    /**
     * [refund 微信支付退款]
     * @param  [type] $order [订单信息]
     * @param  [type] $type  [是否是小程序]
     */
    public static function refund($order)
    {
        $config = self::$config;
        if(empty($order[&#39;refund_sn&#39;]) || empty($order[&#39;refund_amount&#39;]) || (empty($order[&#39;order_sn&#39;]) && empty($order[&#39;transaction_id&#39;]))){
            die("订单数组信息缺失！");
        }

        $params = array(
            &#39;out_refund_no&#39; => (string)$order[&#39;refund_sn&#39;], // 商户退款单号
            &#39;funds_account&#39; => &#39;AVAILABLE&#39;, // 退款资金来源
            &#39;amount&#39; => [
                    &#39;refund&#39; => $order[&#39;refund_amount&#39;],
                    &#39;currency&#39; => &#39;CNY&#39;,
                ]
        );

        if (!empty($order[&#39;transaction_id&#39;])) {
            $params[&#39;transaction_id&#39;] = $order[&#39;transaction_id&#39;];
            $orderDetail = self::query($order[&#39;transaction_id&#39;], true);
        } else {
            $params[&#39;out_trade_no&#39;] = $order[&#39;order_sn&#39;];
            $orderDetail = self::query($order[&#39;order_sn&#39;]);
        }
        $params[&#39;amount&#39;][&#39;total&#39;] = $orderDetail[&#39;amount&#39;][&#39;total&#39;];
        !empty($order[&#39;reason&#39;]) && $params[&#39;reason&#39;] = $order[&#39;reason&#39;];

        $url = self::$refundUrl;
        $header = self::createAuthorization($url, $params, &#39;POST&#39;);
        $response = Http::post($url, json_encode($params, JSON_UNESCAPED_UNICODE), $header);
        $result = json_decode($response, true);

        return $result;
    }

    /**
     * [queryRefund 查询退款]
     * @param  [type] $refundSn [退款单号]
     * @return [type]           [description]
     */
    public static function queryRefund($refundSn, $type = false)
    {
        $url = self::$refundUrl . &#39;/&#39; . $refundSn;
        $params = &#39;&#39;;

        $header = self::createAuthorization($url, $params, &#39;GET&#39;);
        $response = Http::get($url, $params, $header);
        $result = json_decode($response, true);

        return $result;
    }

    /**
     * [success 通知支付状态]
     */
    public static function success()
    {
        $str = [&#39;code&#39;=>&#39;SUCCESS&#39;, &#39;message&#39;=>&#39;成功&#39;];
        die(json_encode($str, JSON_UNESCAPED_UNICODE));
    }

    /**
     * [createAuthorization 获取接口授权header头信息]
     * @param  [type] $url    [请求地址]
     * @param  array  $data   [请求参数]
     * @param  string $method [请求方式]
     * @return [type]         [description]
     */
    //生成v3 Authorization
    protected static function createAuthorization($url, $data=[], $method=&#39;POST&#39;){
        $config = self::$config;
        //商户号
        $mchid = $config[&#39;mchid&#39;];
        // 证书序列号
        if (empty($config[&#39;serial_no&#39;])) {
            $certFile = @file_get_contents($config[&#39;cert_client&#39;]);
            $certArr = openssl_x509_parse($publicStr);
            $serial_no = $certArr[&#39;serialNumberHex&#39;];
        } else {
            $serial_no = $config[&#39;serial_no&#39;];
        }

        // 解析url地址
        $url_parts = parse_url($url);
        //生成签名
        $body = [
            &#39;method&#39; => $method,
            &#39;url&#39;   => ($url_parts[&#39;path&#39;] . (!empty($url_parts[&#39;query&#39;]) ? "?${url_parts[&#39;query&#39;]}" : "")),
            &#39;time&#39;  => time(), // 当前时间戳
            &#39;nonce&#39; => self::get_rand_str(32, 0, 1), // 随机32位字符串
            &#39;data&#39;  => (strtolower($method) == &#39;post&#39; ? json_encode($data, JSON_UNESCAPED_UNICODE) : $data), // POST请求时 需要 转JSON字符串
        ];
        $sign = self::makeSign($body);
        //Authorization 类型
        $schema = &#39;WECHATPAY2-SHA256-RSA2048&#39;;
        //生成token
        $token = sprintf(&#39;mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"&#39;, $mchid, $body[&#39;nonce&#39;], $body[&#39;time&#39;], $serial_no, $sign);

        $header = [
            &#39;Content-Type:application/json&#39;,
            &#39;Accept:application/json&#39;,
            &#39;User-Agent:*/*&#39;,
            &#39;Authorization: &#39;.  $schema . &#39; &#39; . $token
        ];
        return $header;
    }

    /**
     * [makeSign 生成签名]
     * @param  [type] $data [加密数据]
     * @return [type]       [description]
     */
    public static function makeSign($data)
    {
        $config = self::$config;
        if (!in_array(&#39;sha256WithRSAEncryption&#39;, \openssl_get_md_methods(true))) {
            throw new \RuntimeException("当前PHP环境不支持SHA256withRSA");
        }
        // 拼接生成签名所需的字符串
        $message = &#39;&#39;;
        foreach ($data as $value) {
            $message .= $value . "\n";
        }
        // 商户私钥
        $private_key = self::getPrivateKey($config[&#39;cert_key&#39;]);
        // 生成签名
        openssl_sign($message, $sign, $private_key, &#39;sha256WithRSAEncryption&#39;);
        $sign = base64_encode($sign);
        return $sign;
    }

    /**
     * [verifySign 验证签名]
     * @param  [type] $data   [description]
     * @param  [type] $sign   [description]
     * @param  [type] $serial [description]
     * @return [type]         [description]
     */
    public static function verifySign($data, $sign, $serial)
    {
        $config = self::$config;
        if (!in_array(&#39;sha256WithRSAEncryption&#39;, \openssl_get_md_methods(true))) {
            throw new \RuntimeException("当前PHP环境不支持SHA256withRSA");
        }
        $sign = \base64_decode($sign);
        // 拼接生成签名所需的字符串
        $message = &#39;&#39;;
        foreach ($data as $value) {
            $message .= $value . "\n";
        }
        // 获取证书相关信息
        self::certificates($serial);
        // 平台公钥
        $public_key = self::getPublicKey($config[&#39;public_key&#39;]); //平台公钥
        // 验证签名
        $recode = \openssl_verify($message, $sign, $public_key, &#39;sha256WithRSAEncryption&#39;);
        return $recode == 1 ? true : false;
    }

    //获取私钥
    public static function getPrivateKey($filepath)
    {
        return openssl_pkey_get_private(file_get_contents($filepath));
    }

    //获取公钥
    public static function getPublicKey($filepath)
    {
        return openssl_pkey_get_public(file_get_contents($filepath));
    }

    /**
     * [certificates 获取证书]
     * @return [type] [description]
     */
    public static function certificates($serial)
    {
        $config = self::$config;

        $publicStr = @file_get_contents($config[&#39;public_key&#39;]);
        if ($publicStr) { // 判断证书是否存在
            $openssl = openssl_x509_parse($publicStr);
            if ($openssl[&#39;serialNumberHex&#39;] == $serial) { // 是否是所需证书
                // return self::getPublicKey($config[&#39;public_key&#39;]); //平台公钥
                return &#39;&#39;;
            }
        }

        $url = self::$certificatesUrl;
        $params = &#39;&#39;;

        $header = self::createAuthorization($url, $params, &#39;GET&#39;);
        $response = Http::get($url, $params, $header);
        $result = json_decode($response, true);
        if (empty($result[&#39;data&#39;])) {
            throw new RuntimeException("[" . $result[&#39;code&#39;] . "] " . $result[&#39;message&#39;]);
        }
        foreach ($result[&#39;data&#39;] as $key => $certificate) {
            if ($certificate[&#39;serial_no&#39;] == $serial) {
                $publicKey = self::decryptToString(
                    $certificate[&#39;encrypt_certificate&#39;][&#39;associated_data&#39;],
                    $certificate[&#39;encrypt_certificate&#39;][&#39;nonce&#39;],
                    $certificate[&#39;encrypt_certificate&#39;][&#39;ciphertext&#39;]
                );
                file_put_contents($config[&#39;public_key&#39;], $publicKey);
                break; // 终止循环
            }
            // self::$publicKey[$certificate[&#39;serial_no&#39;]] = $publicKey;
        }
        // return self::getPublicKey($config[&#39;public_key&#39;]); //平台公钥
    }

    /**
     * [decryptToString 证书和回调报文解密]
     * @param  [type] $associatedData [附加数据包（可能为空）]
     * @param  [type] $nonceStr       [加密使用的随机串初始化向量]
     * @param  [type] $ciphertext     [Base64编码后的密文]
     * @return [type]                 [description]
     */
    public static function decryptToString($associatedData, $nonceStr, $ciphertext)
    {
        $config = self::$config;
        $ciphertext = base64_decode($ciphertext);
        if (strlen($ciphertext) <= self::AUTH_TAG_LENGTH_BYTE) {
            return false;
        }

        // ext-sodium (default installed on >= PHP 7.2)
        if (function_exists(&#39;\sodium_crypto_aead_aes256gcm_is_available&#39;) &&
            \sodium_crypto_aead_aes256gcm_is_available()) {
            return \sodium_crypto_aead_aes256gcm_decrypt($ciphertext, $associatedData, $nonceStr, $config[&#39;key&#39;]);
        }

        // ext-libsodium (need install libsodium-php 1.x via pecl)
        if (function_exists(&#39;\Sodium\crypto_aead_aes256gcm_is_available&#39;) &&
            \Sodium\crypto_aead_aes256gcm_is_available()) {
            return \Sodium\crypto_aead_aes256gcm_decrypt($ciphertext, $associatedData, $nonceStr, $config[&#39;key&#39;]);
        }

        // openssl (PHP >= 7.1 support AEAD)
        if (PHP_VERSION_ID >= 70100 && in_array(&#39;aes-256-gcm&#39;, \openssl_get_cipher_methods())) {
            $ctext = substr($ciphertext, 0, -self::AUTH_TAG_LENGTH_BYTE);
            $authTag = substr($ciphertext, -self::AUTH_TAG_LENGTH_BYTE);

            return \openssl_decrypt($ctext, &#39;aes-256-gcm&#39;, $config[&#39;key&#39;], \OPENSSL_RAW_DATA, $nonceStr,
                $authTag, $associatedData);
        }

        throw new \RuntimeException(&#39;AEAD_AES_256_GCM需要PHP 7.1以上或者安装libsodium-php&#39;);
    }

    /** fengkui.net
     * [get_rand_str 获取随机字符串]
     * @param  integer $randLength    [长度]
     * @param  integer $addtime       [是否加入当前时间戳]
     * @param  integer $includenumber [是否包含数字]
     * @return [type]                 [description]
     */
    public static function get_rand_str($randLength=6, $addtime=0, $includenumber=1)
    {
        if ($includenumber)
            $chars=&#39;abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQEST123456789&#39;;
        $chars=&#39;abcdefghijklmnopqrstuvwxyz&#39;;

        $len = strlen($chars);
        $randStr = &#39;&#39;;
        for ($i=0; $i<$randLength; $i++){
            $randStr .= $chars[rand(0, $len-1)];
        }
        $tokenvalue = $randStr;
        $addtime && $tokenvalue = $randStr . time();
        return $tokenvalue;
    }

    /** fengkui.net
     * [get_ip 定义一个函数get_ip() 客户端IP]
     * @return [type] [description]
     */
    public static function get_ip()
    {
        if (getenv("HTTP_CLIENT_IP"))
            $ip = getenv("HTTP_CLIENT_IP");
        else if(getenv("HTTP_X_FORWARDED_FOR"))
            $ip = getenv("HTTP_X_FORWARDED_FOR");
        else if(getenv("REMOTE_ADDR"))
            $ip = getenv("REMOTE_ADDR");
        else $ip = "Unknow";

        if(preg_match(&#39;/^((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1 -9]?\d))))$/&#39;, $ip))
            return $ip;
        else
            return &#39;&#39;;
    }
}

本文参考文档：
1、微信支付 小程序 （v3）- PHP 完整后端代码
2、PHP 微信小程序 微信支付 v3
3、微信支付V3版本小程序支付 php签名,验签,数据解密代码分享（完整方法主参考）
4、微信支付 API v3 回调通知 签名验证 PHPdemo有嘛？

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