방문자 실제 사용하는 IP(Real IP) 구하기 > 기술자료

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<?php
// 방법1
if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip1 = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip1 = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip1 = $_SERVER['REMOTE_ADDR'];
}


// 방법2
$ip2 = $_SERVER['HTTP_CLIENT_IP']?$_SERVER['HTTP_CLIENT_IP']:($_SERVER['HTTP_X_FORWARDED_FOR']?$_SERVER['HTTP_X_FORWARDED_FOR']:$_SERVER['REMOTE_ADDR']);


// 방법3. isset을 사용하여 통지를 제거한 코드
$ip3 = isset($_SERVER['HTTP_CLIENT_IP'])?$_SERVER['HTTP_CLIENT_IP']:isset($_SERVER['HTTP_X_FORWARDED_FOR'])?$_SERVER['HTTP_X_FORWARDED_FOR']:$_SERVER['REMOTE_ADDR'];


// 방법4
function getUserIP()
{
    // Get real visitor IP behind CloudFlare network
    if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
              $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
              $_SERVER['HTTP_CLIENT_IP'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
    }
    $client  = @$_SERVER['HTTP_CLIENT_IP'];
    $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
    $remote  = $_SERVER['REMOTE_ADDR'];

    if(filter_var($client, FILTER_VALIDATE_IP))
    {
        $ip = $client;
    }
    elseif(filter_var($forward, FILTER_VALIDATE_IP))
    {
        $ip = $forward;
    }
    else
    {
        $ip = $remote;
    }

    return $ip;
}
$ip4 = getUserIP();


echo "코드1 = ". $ip1."<br><br>";
echo "코드2 = ". $ip2."<br><br>";
echo "코드3 = ". $ip3."<br><br>";
echo "코드4 = ". $ip4."<br><br>";
?>


데모 : https://www.happyjung.com/demo/php/x-real_ip.php


참고자료
https://code.i-harness.com/ko-kr/q/2dd309
https://stackoverflow.com/questions/13646690/how-to-get-real-ip-from-visitor