php、Thinkphp微信支付V3 、php、Thinkphp微信API V3、摒弃官方demo，自写调用demo

以前一直使用v2，格式是xml格式，但是微信最新推出v3之后，只有以前的老用户才能用v2，而新用户只能用v3。阅读了一下文档，发现v3采用的是json格式和以前的xml大有不同。官方的demo又不清不白，用的是guzzle（关键我不会啊，研究又要太久时间，项目赶，没办法只有自己编写一个demo了，希望可以帮助大家）

首先创建一个文件和类，如WxPayv3.php，请勿直接复制，因为可以看到这个类继承了另一个类（别担心，父类只是一些配置参数而已，可以自己去创建一个，我就不写出来了）

<?php
namespace wx;
use wxWxExtend;
class WxPayv3 extends WxExtend{
    
    /**
     * # +========================================================================
     * # | - @name        执行
     * # | - @author     cq <just_leaf@foxmail.com> 
     * # | - @copyright zmtek 2021-01-20
     * # +========================================================================
     */
    public function execute($url,$body = null,$http_method = 'POST') {
        
        # 转化大写
        $http_method = strtoupper($http_method);
        
        if($http_method == 'POST') {
            
            $body   = json_encode($body);
        }else{
            
            $url    = $url . '?' . http_build_query($body); 
            $body   = null;
        }
        
        # 分割符号
        $sign       = $this -> getV3Sign($url,$http_method,$body);
        
        $header[]   = 'User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.108 Safari/537.36';
        $header[]   = 'Accept: application/json';
        $header[]   = 'Content-Type: application/json;';
        $header[]   = 'Authorization: WECHATPAY2-SHA256-RSA2048 '.$sign;
    
        $exc        = $this -> Curl($url,$body,$http_method,$header);
        return $exc;
    }
    
    /**
     * # +========================================================================
     * # | - @name        请求
     * # | - @author     cq <just_leaf@foxmail.com> 
     * # | - @copyright zmtek 2021-01-20
     * # +========================================================================
     */
    public function Curl($url, $data, $http_method,$header = array(), $timeout = 30)
    {
        $opts = array(
                CURLOPT_TIMEOUT        => 30,
                CURLOPT_RETURNTRANSFER => 1,
                CURLOPT_SSL_VERIFYPEER => false,
                CURLOPT_SSL_VERIFYHOST => false,
                CURLOPT_HTTPHEADER     => $header,
                CURLOPT_URL            => $url,
                CURLOPT_HEADER         => 1 ,
        );
        
        # 根据请求类型设置特定参数
        if($http_method == 'POST') {
            
            # 判断是否传输文件
            $opts[CURLOPT_POST] = 1;
            $opts[CURLOPT_POSTFIELDS] = $data;
        }
                
        # 初始化并执行curl请求
        $ch         = curl_init();
        curl_setopt_array($ch, $opts);
        
        $data       = curl_exec($ch);
        $error      = curl_error($ch);
        $httpCode   = curl_getinfo($ch,CURLINFO_HTTP_CODE); 
        curl_close($ch);
        if($error) throw new Exception('请求发生错误：' . $error);
        list($headers, $body) = explode("

", $data, 2);
        
        $result['data']     = $body;
        $result['httpcode'] = $httpCode;
        $result['headers']  = explode("
", $headers);
        return  $result;
    }
    
    /**
     * # +========================================================================
     * # | - @name        签名
     * # | - @author     cq <just_leaf@foxmail.com> 
     * # | - @copyright zmtek 2021-01-20
     * # +========================================================================
     */
    public function getV3Sign($url,$http_method,$body) {
        
        # 商户号
        $merchant_id    = $this -> MCHID;
        # 随机字符串
        $nonce          = strtoupper($this -> getNoncestr());
        # 商户序列号
        $serial_no      = $this -> merchantSerialNumber;
        # 时间搓
        $timestamp      = time();
        # url
        $url_parts      = parse_url($url);
        # 获取绝对路径
        $canonical_url  = ($url_parts['path'] . (!empty($url_parts['query']) ? "?${url_parts['query']}" : ""));
        # 密钥key
        $private_key    = $this -> getPrivateKey($this -> SSLKEY_PATH);
        # 拼接参数
        $message        = 
        $http_method."
".
        $canonical_url."
".
        $timestamp."
".
        $nonce."
".
        $body."
";
        
        # 获取签名             
        openssl_sign($message, $raw_sign, $private_key, 'sha256WithRSAEncryption');
        $sign   = base64_encode($raw_sign);
        
        $token  = sprintf('mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"',
        $merchant_id, $nonce, $timestamp, $serial_no, $sign);
        return $token;
    }

    /**
     * # +========================================================================
     * # | - @name        获取私钥
     * # | - @author     cq <just_leaf@foxmail.com> 
     * # | - @copyright zmtek 2019-12-26
     * # +========================================================================
     */
    public function getPrivateKey($filepath) {
        
        return openssl_get_privatekey(file_get_contents($filepath));
    }
    
    /**
     * # +========================================================================
     * # | - @name        获取随机数
     * # | - @author     cq <just_leaf@foxmail.com> 
     * # | - @copyright zmtek 2021-01-20
     * # +========================================================================
     */
    public function getNoncestr($length = 32) {
        
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ )  {  
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);  
        }  
        return $str;
    }
}

 然后再new再调用就完事了

/**
         * # +========================================================================
         * # | - @name        查询用户
         * # | - @author     cq <just_leaf@foxmail.com> 
         * # | - @copyright zmtek 2020-11-24
         * # +------------------------------------------------------------------------
         * # | - 1.msg
         * # +========================================================================
         */
        public function permissions_openid(WxPayv3 $WxPayv3,WxExtend $WxExtend) {
            
            $url    = 'https://api.mch.weixin.qq.com/v3/payscore/permissions/openid/xxxx';
            $authorization_code = $WxPayv3 -> getNoncestr();
            $data   = array(
                'appid'                 => $WxExtend -> appletappid ,
                'service_id'            => $WxExtend -> service_id,
            );
            
            $result = $WxPayv3 -> execute($url,$data,'GET');
            pf($result);
            // $data   = json_decode($result['data'],true);
            // return $this -> success($data);
        }

好，我们来看调用结果

啊呀，好家伙，是不是我这个方法有问题呢？结果赶紧看下官方文档，原来是微信那边挂了。不信？看下图

好啦，之后就可以愉快的调用任何接口了。

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