PHP Warning: file_get_contents(http://ipecho.net/plain): failed to open stream: Connection timed out in

Question

I have an error here and I don't know where the problem is exactly. I am trying to make a PHP file and deny anyone to use the script except the IP that I have entered into the code:

$pass = '192.168.x.x'; //here is the ip of the client
if (file_get_contents('http://ipecho.net/plain') !== $pass) {

When I use the code Ii have problem

PHP Warning:  file_get_contents(http://ipecho.net/plain): failed to open stream: Connection timed out

Answer 1

Why you use that site for getting the client's IP?

You can use this PHP function for getting the client's IP address.

whenever the application is behind a proxy(e.g, Cloudflare):

function get_client_ip() {
    $ipaddress = '';
    if ($_SERVER['HTTP_CLIENT_IP'])
        $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
    else if($_SERVER['HTTP_X_FORWARDED_FOR'])
        $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
    else if($_SERVER['HTTP_X_FORWARDED'])
        $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
    else if($_SERVER['HTTP_FORWARDED_FOR'])
        $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
    else if($_SERVER['HTTP_FORWARDED'])
        $ipaddress = $_SERVER['HTTP_FORWARDED'];
    else if($_SERVER['REMOTE_ADDR'])
        $ipaddress = $_SERVER['REMOTE_ADDR'];
    else
        $ipaddress = 'UNKNOWN';
    return $ipaddress;
}

and when the application isn't behind a proxy:

function get_client_ip() {
    return $_SERVER['REMOTE_ADDR'];
}

Final code should be like this:

$pass = '192.168.x.x'; //here is the ip of the client
if (strcmp(get_client_ip(),$pass) == 0 ) {