微信支付jsapi v3支付实例

参考https://blog.csdn.net/qq_15758827/article/details/110002894

    核心代码：

          $jsapi = [
                   'appid' => $weixin_set['appid'],
                   'mchid' => $weixin_set['mchid'],
                   'description' => '本元商品购买',
                   'out_trade_no' => $pay['number'],
                   'notify_url' => $weixin_set['notify_url'],
                   'amount' => [
                   'total' => 0.01 * 100,
            //      'total' => $pay['price'] * 100,
                   'currency' => 'CNY',
                   ],
           'payer' => [
                       'openid' => $user_info['openid']
                  ],
                       ];
                    
                    
            //解析URL的函数       
            $urlarr = parse_url($url);
            $timeStamp = time();
            //随机字符串
            $nonceStr = getRandom(32);
            $jsapi = json_encode($jsapi);
            $key = getSign1($jsapi, $urlarr['path'], $nonceStr, $timeStamp);//签名
            $token = sprintf('mchid="%s",serial_no="%s",nonce_str="%s",timestamp="%d",signature="%s"', $weixin_set['mchid'], $weixin_set['number'], $nonceStr, $timeStamp, $key);//头部信息
            $header = array(
                'Content-Type:' . 'application/json; charset=UTF-8',
                'Accept:application/json',
                'User-Agent:application/json',
                'Authorization: WECHATPAY2-SHA256-RSA2048 ' . $token
            );
            //curl post 请求
            $curl_info = curl_post_https($url, $jsapi, $header);
            $ret = json_decode($curl_info, true);
            if (empty($ret['prepay_id'])) {
                return json_return(500, '支付失败', $ret);
            }
            $Sign = $weixin_set['appid'] . "\n" . $timeStamp . "\n" . $nonceStr . "\n" . 'prepay_id=' . $ret['prepay_id'] . "\n";
            $pay_info = [
                'timeStamp' => $timeStamp,
                'nonceStr' => $nonceStr,
                'package' => 'prepay_id=' . $ret['prepay_id'],
                'signType' => 'RSA',
                'paySign' => getSha256WithRSA2($Sign),
                'id' => $pay['id'],
                'price' => $pay['price'],
            ];

    //随机字符串：

//随机字符串
function getRandom($param)
{
    $str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $key = "";
    for ($i = 0; $i < $param; $i++) {
        $key .= $str[mt_rand(0, 35)];     //生成php随机数
    }
    return $key;
}

//微信签名

//微信支付签名
function getSign1($data, $url, $randstr, $time)
{
    $str = "POST" . "\n" . $url . "\n" . $time . "\n" . $randstr . "\n" . $data . "\n";
    $key = file_get_contents('./pem/apiclient_key.pem');//在商户平台下载的秘钥
    $str = $this->getSha256WithRSA($str, $key);
    return $str;
}

function getSha256WithRSA($content, $privateKey)
{
    $binary_signature = "";
    $algo = "SHA256";
    openssl_sign($content, $binary_signature, $privateKey, $algo);
    $sign = base64_encode($binary_signature);
    return $sign;
}