<?php
/**
 * lemocms
 * ============================================================================
 * 版权所有 2018-2027 lemocms，并保留所有权利。
 * 网站地址: https://www.lemocms.com
 * ----------------------------------------------------------------------------
 * 采用最新Thinkphp6实现
 * ============================================================================
 * Author: yuege
 * Date: 2019/9/26
 */

namespace lemo\helper;
class IpHelper
{
    public static function is_ip($str)
    {
        $ip = explode('.', $str);
        for ($i = 0; $i < count($ip); $i++) {
            if ($ip[$i] > 255) {
                return false;
            }
        }
        return preg_match('/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/', $str);
    }

    public static function  ip(){
        $ip='未知IP';
        if(!empty($_SERVER['HTTP_CLIENT_IP'])){
            return is_ip($_SERVER['HTTP_CLIENT_IP'])?$_SERVER['HTTP_CLIENT_IP']:$ip;
        }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
            return is_ip($_SERVER['HTTP_X_FORWARDED_FOR'])?$_SERVER['HTTP_X_FORWARDED_FOR']:$ip;
        }else{
            return is_ip($_SERVER['REMOTE_ADDR'])?$_SERVER['REMOTE_ADDR']:$ip;
        }
    }


}