原有的thinkphp5只支持IPv4，所有的IPv6访问使用request()->ip()获取到的IP地址均会显示为0.0.0.0，查看代码发现thinkphp5的底层函数并不支持IPv6

为了让thinkphp5的项目也能运行在IPv6网络环境中并记录IP地址，修改如下：

打开thinkphp\library\think目录下的Request.php文件，搜索 function ip，定位到 ip 函数，大约在1301行，把原有的ip函数整体替换为：

   public function ip($type = 0, $adv = true)
    {
        $type      = $type ? 1 : 0;
        static $ip = null;
        if (null !== $ip) {
            return $ip[$type];
        }
        $httpAgentIp = Config::get('http_agent_ip');
        if ($httpAgentIp && isset($_SERVER[$httpAgentIp])) {
            $ip = $_SERVER[$httpAgentIp];
        } elseif ($adv) {
            if (isset($_SERVER['HTTP_ALI_CDN_REAL_IP'])) {
                $ip = $_SERVER['HTTP_ALI_CDN_REAL_IP']; // 阿里CDN回传的真实IP优先
            } elseif (isset($_SERVER['HTTP_CDN_SRC_IP'])) {
                $ip = $_SERVER['HTTP_CDN_SRC_IP']; // 华为云CDN回传的真实IP优先
            } else if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
                $pos = array_search('unknown', $arr);
                if (false !== $pos) {
                    unset($arr[$pos]);
                }
                $ip = trim(current($arr));
            } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
                $ip = $_SERVER['HTTP_CLIENT_IP'];
            } elseif (isset($_SERVER['REMOTE_ADDR'])) {
                $ip = $_SERVER['REMOTE_ADDR'];
            }
        } elseif (isset($_SERVER['REMOTE_ADDR'])) {
            $ip = $_SERVER['REMOTE_ADDR'];
&nE4??的真实IP优先
            } elseif (isset($_SERVER['HTTP_CDN_SRC_IP'])) {
                $ip = $_SERVER['HTTP_CDN_SRC_IP']; // 华为云CDN回传的真实IP优先
            } elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
                $pos = array_search('unknown', $arr);
                if (false !== $pos) {
                    unset($arr[$pos]);
                }
                $ip = trim(current($arr));
            } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
                $ip = $_SERVER['HTTP_CLIENT_IP'];
            } elseif (isset($_SERVER['REMOTE_ADDR'])) {
                $ip = $_SERVER['REMOTE_ADDR'];
            }
        } elseif (isset($_SERVER['REMOTE_ADDR'])) {
            $ip = $_SERVER['REMOTE_ADDR'];
        }
        // IP地址合法验证
        if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
            $ip = [$ip, '::'];
        } else {
            $long = sprintf("%u", ip2long($ip));
            $ip   = $long ? [$ip, $long] : ['0.0.0.0', 0];
        }
        return $ip[$type];
    }

至此，修改完毕，保存退出即可