IP login authentication

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I am creating a PHP application for login authentication:

$phpsessid = 'SID: ".SID."<br>session_id(): ".session_id()."<br>COOKIE: ".$_COOKIE["PHPSESSID"]';
file_put_contents("$ip","$phpsessid");
$m = "localhost/'.$ip.'";
$res = file_get_contents("$m");
$title=@$this->stribet($res,'SID:','<br>');
}

the $phpsessid will contain the data, time, IP, logged in account, time, etc. How do I check an IP at login time? For example:

IP=>Conta=>PHPSESSID
php auth

1 answer

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Using proxy server, the IP you will get will be the proxy server and not the actual IP address of the user. Example: 

$ip = $_SERVER['REMOTE_ADDR'];

But fortunately we can make an additional refinement for more accurate results. Proxy servers bring in the HTTP header a property that stores the original IP. Example:

echo "Remote addr: " .$_SERVER['REMOTE_ADDR'] . "<br/>";

echo "X Forward: " . $_SERVER['HTTP_X_FORWARDED_FOR'] . "<br/>";

echo "Clien IP: " . $_SERVER['HTTP_CLIENT_IP'] . "<br/>";

At login time a comparison of the user with the IP is made.

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