search
HomeBackend DevelopmentPHP ProblemHow to get the client's IP address in php?

How to get the client's IP address in php?

Oct 15, 2019 pm 01:45 PM
IP addressphp

How to get the client's IP address in php?

1. If no proxy server is used

REMOTE_ADDR = Client IP

HTTP_X_FORWARDED_FOR = No value or not displayed

$ip = $_SERVER['REMOTE_ADDR'];

2. Use transparent proxy

REMOTE_ADDR = Last proxy server IP

HTTP_X_FORWARDED_FOR = client's 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 , 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 real IP of the client , but the server will know that the client accesses through the proxy server.

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 when passing the proxy server accessed, but the fake IP sent to the target server.

5. Use a high-anonymity proxy

REMOTE_ADDR = Proxy server IP

HTTP_X_FORWARDED_FOR = No The value may not be displayed

When using this kind of proxy, different browsers and different devices will return different IP header information, so PHP uses $_SERVER["REMOTE_ADDR"], $_SERVER[" HTTP_X_FORWARDED_FOR"] The value obtained 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[&#39;REMOTE_ADDR&#39;];
    }
    $res =  preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
    echo $res;
    //dump(phpinfo());//所有PHP配置信息
}

For more PHP related knowledge, please visit PHP Chinese website!

The above is the detailed content of How to get the client's IP address in php?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function