「代码复用」获取客户端IP

2018-08-08 代码复用阅读量

Don’t repeat yourself

直接上源码

<?php

// Client releated operations
// @caoxl

namespace App\Traits;

class Client
{
    public static function ip()
    {
        if ($clientIP = self::tryIPKey('HTTP_CLIENT_IP')) {
        } elseif ($clientIP = self::tryIPKey('HTTP_X_FORWARDED_FOR')) {
        } elseif ($clientIP = self::tryIPKey('HTTP_X_FORWARDED')) {
        } elseif ($clientIP = self::tryIPKey('HTTP_FORWARDED_FOR')) {
        } elseif ($clientIP = self::tryIPKey('HTTP_FORWARDED')) {
        } elseif ($clientIP = self::tryIPKey('REMOTE_ADDR')) {
        } else $clientIP = 'UNKNOWN';

        return $clientIP;
    }

    public static function tryIPKey(string $possibleKey)
    {
        return getenv($possibleKey)
            ?? (
                $_SERVER[$possibleKey] ?? null
            );
    }
}

说明:

getenv() - 获取一个环境变量的值
HTTP_CLIENT_IP - $_SERVER[‘HTTP_CLIENT_IP’]

HTTP_CLIENT_IP 是代理服务器发送的HTTP头。如果是“超级匿名代理”，则返回none值

HTTP_X_FORWARDED_FOR - $_SERVER[‘HTTP_X_FORWARDED_FOR’]

用来识别经过HTTP代理后的客户端IP地址（有可能存在，也可以伪造）

HTTP_X_FORWARDED - $_SERVER[‘HTTP_X_FORWARDED’]
HTTP_FORWARDED_FOR - $_SERVER[‘HTTP_FORWARDED_FOR’]

X-Forwarded-For（XFF）是用来识别通过HTTP代理或负载均衡方式连接到Web服务器的客户端最原始的IP地址的HTTP请求头字段

HTTP_FORWARDED - $_SERVER[‘HTTP_FORWARDED’]
REMOTE_ADDR - $_SERVER[‘REMOTE_ADDR’]

REMOTE_ADDR 是你的客户端跟你的服务器“握手”时候的IP。如果使用了“匿名代理”，REMOTE_ADDR将显示代理服务器的IP。
浏览当前页面的用户的 IP 地址。