PHP获取用户IP地址的最准确方法

这是获取IP地址的更简洁，更简洁的方法：

function get_ip_address(){
    foreach (array(\'HTTP_CLIENT_IP\', \'HTTP_X_FORWARDED_FOR\', \'HTTP_X_FORWARDED\', \'HTTP_X_CLUSTER_CLIENT_IP\', \'HTTP_FORWARDED_FOR\', \'HTTP_FORWARDED\', \'REMOTE_ADDR\') as $key){
        if (array_key_exists($key, $_SERVER) === true){
            foreach (explode(\',\', $_SERVER[$key]) as $ip){
                $ip = trim($ip); // just to be safe

                if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) !== false){
                    return $ip;
                }
            }
        }
    }
}

我希望它有所帮助！

您的代码似乎已经相当完整，我看不到任何可能的错误（除了通常的IP警告），我会更改validate_ip()函数依赖于过滤器扩展：

public function validate_ip($ip)
{
    if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false)
    {
        return false;
    }

    self::$ip = sprintf(\'%u\', ip2long($ip)); // you seem to want this

    return true;
}

您的HTTP_X_FORWARDED_FOR代码段也可以简化：

// check for IPs passing through proxies
if (!empty($_SERVER[\'HTTP_X_FORWARDED_FOR\']))
{
    // check if multiple ips exist in var
    if (strpos($_SERVER[\'HTTP_X_FORWARDED_FOR\'], \',\') !== false)
    {
        $iplist = explode(\',\', $_SERVER[\'HTTP_X_FORWARDED_FOR\']);

        foreach ($iplist as $ip)
        {
            if ($this->validate_ip($ip))
                return $ip;
        }
    }

    else
    {
        if ($this->validate_ip($_SERVER[\'HTTP_X_FORWARDED_FOR\']))
            return $_SERVER[\'HTTP_X_FORWARDED_FOR\'];
    }
}

对此：

// check for IPs passing through proxies
if (!empty($_SERVER[\'HTTP_X_FORWARDED_FOR\']))
{
    $iplist = explode(\',\', $_SERVER[\'HTTP_X_FORWARDED_FOR\']);

    foreach ($iplist as $ip)
    {
        if ($this->validate_ip($ip))
            return $ip;
    }
}

您可能还需要验证IPv6地址。