How to get the real IP address of the client in PHP

This article mainly introduces the method of obtaining the real IP address of the client with PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it

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php has four methods to obtain the client IP address. These five methods are

REMOTE_ADDR
HTTP_CLIENT_IP
HTTP_X_FORWARDED_FOR
HTTP_VIA

REMOTE_ADDR is the IP when your client "handshakes" with your server. If an "anonymous proxy" is used, REMOTE_ADDR will display the IP of the proxy server.

HTTP_CLIENT_IP is the HTTP header sent by the proxy server. If it is a "super anonymous proxy", a value of none is returned. Likewise, REMOTE_ADDR will be replaced with the IP of this proxy server.

$_SERVER['REMOTE_ADDR']; //Accessing end (may be user, may be proxy) IP

$_SERVER['HTTP_CLIENT_IP']; //Agent end ( It may exist and can be forged)

$_SERVER['HTTP_X_FORWARDED_FOR']; //Which IP the user is using as a proxy (It may exist and it can also be forged)

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##Three The value difference is as follows:

1. When no proxy server is used:

REMOTE_ADDR = Your IP

HTTP_VIA = No value or not displayed
HTTP_X_FORWARDED_FOR = No value or not displayed

2. When using a transparent proxy server: Transparent Proxies

REMOTE_ADDR = The last proxy server IP

HTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = your real IP. When passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.

This type of proxy server still forwards your information to your visitor, which cannot achieve the purpose of hiding your true identity.

3. When using ordinary anonymous proxy servers: Anonymous Proxies

REMOTE_ADDR = Last proxy server IP

HTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = Proxy server IP, when passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.

Hides your real IP, but reveals to the target audience that you are using a proxy server to access them.

4. The use of deceptive proxy servers: Distorting Proxies

REMOTE_ADDR = Proxy server IP

HTTP_VIA = Proxy server IP
HTTP_X_FORWARDED_FOR = Random IP, when passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.

Tell the visitor that you are using a proxy server, but make up a fake random IP instead of your real IP to trick it.

5. When using a high-anonymity proxy server: High Anonymity Proxies (Elite proxies)

REMOTE_ADDR = Proxy server IP

HTTP_VIA = No value or not displayed
HTTP_X_FORWARDED_FOR = No value or not displayed. When passing through multiple proxy servers, this value is similar to the following: 203.98.182.163, 203.98.182.163, 203.129.72.215.

Completely replaces all your information with the proxy server's information, just like you are using that proxy server to directly access the object.

6. Example of obtaining the real IP address of the client:

function get_real_ip()
{
    $ip=FALSE;
    //客户端IP 或 NONE 
    if(!empty($_SERVER["HTTP_CLIENT_IP"])){
        $ip = $_SERVER["HTTP_CLIENT_IP"];
    }
    //多重代理服务器下的客户端真实IP地址（可能伪造）,如果没有使用代理，此字段为空
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);
        if ($ip) { array_unshift($ips, $ip); $ip = FALSE; }
        for ($i = 0; $i < count($ips); $i++) {
            if (!eregi ("^(10│172.16│192.168).", $ips[$i])) {
                $ip = $ips[$i];
                break;
            }
        }
    }
    //客户端IP 或 (最后一个)代理服务器 IP 
    return ($ip ? $ip : $_SERVER[&#39;REMOTE_ADDR&#39;]);
}

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