How to get the client ip address in php

How to get the client ip address in php

1. If a proxy server is not used

REMOTE_ADDR = Client IP HTTP_X_FORWARDED_FOR = No value or not displayed (recommended learning: PHP video tutorial)

$ip = $_SERVER['REMOTE_ADDR'];

2. Use transparent proxy

REMOTE_ADDR = Last proxy server IP

HTTP_X_FORWARDED_FOR = Client real IP (when passing through multiple proxy servers, this value is similar: 221.5.252.160, 203.98.182.163, 203.129.72.215)

This type of proxy will also send the client's real IP to the request object, and the real IP cannot be hidden.

$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];

3. Use ordinary anonymous proxy server

REMOTE_ADDR = Last proxy server IP

HTTP_X_FORWARDED_FOR = Proxy server IP (When passing through multiple proxy servers, this value is similar: 203.98.182.163, 203.98.182.163, 203.129.72.215)

This hides the client’s real IP, but the server will know that the client goes through the proxy server accessed.

4. Use deceptive proxy server

REMOTE_ADDR = Proxy server IP

HTTP_X_FORWARDED_FOR = Random IP (When passing through multiple proxy servers, this value is similar: 220.4.251.159, 203.98.182.163, 203.129.72.215)

The server can identify the access through the proxy server, but the false IP sent to the target server .

5. Use a high-anonymity proxy

REMOTE_ADDR = Proxy server IP HTTP_X_FORWARDED_FOR = No value or not displayed

Use this When using different proxies, different browsers and different devices will return different IP header information, so the value obtained by PHP using $_SERVER["REMOTE_ADDR"] and $_SERVER["HTTP_X_FORWARDED_FOR"] may be a null value or an "unknown" value.

PHP obtains the ip code as follows:

public function ip() {
    //strcasecmp 比较两个字符，不区分大小写。返回0，>0，<0。
    if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
        $ip = getenv('HTTP_CLIENT_IP');
    } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
        $ip = getenv('HTTP_X_FORWARDED_FOR');
    } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
        $ip = getenv('REMOTE_ADDR');
    } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    $res =  preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
    echo $res;
    //dump(phpinfo());//所有PHP配置信息
}

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