getting Undefined index error in php code.

[sssunny]

Notice: Undefined index: HTTP_CLIENT_IP in C:\xampp\htdocs\newpractice 1\video66.php on line 3

Notice: Undefined index: HTTP_X_FORWARDED_FOR in C:\xampp\htdocs\newpractice 1\video66.php on line 4
127.0.0.1

<?php

$http_client_ip= $_SERVER ['HTTP_CLIENT_IP'];
$http_x_forwarded_for= $_SERVER ['HTTP_X_FORWARDED_FOR'];
$remote_addr=$_SERVER['REMOTE_ADDR'];

if(!empty($http_client_ip))
{
$ip_address=$http_client_ip;
}

else if(!empty($http_x_forwarded_for))
{
$ip_address=$http_x_forwarded_for;
}

else
{
$ip_address=$remote_addr;
}
echo $ip_address

?>

[Fou-Lu]

You need to use isset checks. Your server will guarantee nothing when it comes to the population of the $_SERVER superglobal, so you need to assume that nothing exists.

PHP Code:

if (isset($_SERVER['HTTP_CLIENT_IP']))
{
    $ip_address = $_SERVER['HTTP_CLIENT_IP'];
}
else if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
{
    $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
else if ($_SERVER['REMOTE_ADDR'])
{
    $ip_address = $_SERVER['REMOTE_ADDR'];
} 


Should do it.
Although it makes no guarantee, I've never seen the REMOTE_ADDR not set in a webserver environment before.