What should I do if the IP obtained by php is inaccurate?

The inaccurate IP obtained by php may be caused by the user using a proxy, so "$_SERVER['REMOTE_ADDR']" cannot sense the user's real IP. The solution is to define an "X-Forwarded-For" Entity header to get the real ip.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

php The IP obtained is not real?

Everyone, something suddenly occurred to me. We are not using the usual $_SERVER[‘REMOTE_ADDR’]; to obtain the server’s intranet IP (most likely the server’s proxy IP). There is no problem with that code, and then we use a reverse proxy (nginx, etc.), and users may also use proxies, so a simple $_SERVER[‘REMOTE_ADDR’] cannot sense the user’s real IP.

But there is a parameter that can get the real user's address through the proxy IP. Extend the HTTP protocol. An entity header called X-Forwarded-For is defined.

Because we consider this, mainly for the advertising stars, after all, others can act as agents and boost sales.

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The code is as follows:

//获取用户IP地址
    public function getIp()
    {
        if(!empty($_SERVER["HTTP_CLIENT_IP"]))
        {
            $cip = $_SERVER["HTTP_CLIENT_IP"];
        }
        else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
        {
            $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
        }
        else if(!empty($_SERVER["REMOTE_ADDR"]))
        {
            $cip = $_SERVER["REMOTE_ADDR"];
        }
        else
        {
            $cip = '';
        }
        preg_match("/[\d\.]{7,15}/", $cip, $cips);
        $cip = isset($cips[0]) ? $cips[0] : 'unknown';
        unset($cips);
        return $cip;
    }

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