How to get the client IP address in PHP [duplicate]

Answer 1

Just on this, and I'm surprised it hasn't been mentioned yet, is to get the correct IP addresses of those sites that are nestled behind the likes of CloudFlare infrastructure. It will break your IP addresses, and give them all the same value. Fortunately they have some server headers available too. Instead of me rewriting what's already been written, have a look here for a more concise answer, and yes, I went through this process a long while ago too. https://stackoverflow.com/a/14985633/1190051

Answer 2

One of these :

    $ip = $_SERVER['REMOTE_ADDR'];
    $ip = $_SERVER['HTTP_CLIENT_IP'];
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    $ip = $_SERVER['HTTP_X_FORWARDED'];
    $ip = $_SERVER['HTTP_FORWARDED_FOR'];
    $ip = $_SERVER['HTTP_FORWARDED'];

Answer 3

This function should work as expected

function Get_User_Ip()
{
    $IP = false;
    if (getenv('HTTP_CLIENT_IP'))
    {
        $IP = getenv('HTTP_CLIENT_IP');
    }
    else if(getenv('HTTP_X_FORWARDED_FOR'))
    {
        $IP = getenv('HTTP_X_FORWARDED_FOR');
    }
    else if(getenv('HTTP_X_FORWARDED'))
    {
        $IP = getenv('HTTP_X_FORWARDED');
    }
    else if(getenv('HTTP_FORWARDED_FOR'))
    {
        $IP = getenv('HTTP_FORWARDED_FOR');
    }
    else if(getenv('HTTP_FORWARDED'))
    {
        $IP = getenv('HTTP_FORWARDED');
    }
    else if(getenv('REMOTE_ADDR'))
    {
        $IP = getenv('REMOTE_ADDR');
    }

    //If HTTP_X_FORWARDED_FOR == server ip
    if((($IP) && ($IP == getenv('SERVER_ADDR')) && (getenv('REMOTE_ADDR')) || (!filter_var($IP, FILTER_VALIDATE_IP))))
    {
        $IP = getenv('REMOTE_ADDR');
    }

    if($IP)
    {
        if(!filter_var($IP, FILTER_VALIDATE_IP))
        {
            $IP = false;
        }
    }
    else
    {
        $IP = false;
    }
    return $IP;
}

Answer 4

Try this one:

 $_SERVER['REMOTE_ADDR'];

Answer 5

As all others said before you can use $_SERVER['REMOTE_ADDR']; to get the client IP address.

Also, if you need more information about a user, you can use this:

<?php
    $ip = '0.0.0.0';
    $ip = $_SERVER['REMOTE_ADDR'];
    $clientDetails = json_decode(file_get_contents("http://ipinfo.io/$ip/json"));
    echo "You're logged in from: <b>" . $clientDetails->country . "</b>";
?>

Client's more specific information goes in $clientDetails.
You can fetch JSON items stored in $clientDetails variable this way: $clientDetails->PostalCode/hostname/region/loc...

I'm using ipinfo.io to get extra information.

Answer 6

Safe and warnings-aware snippet for getting the IP address:

$ip = filter_input(INPUT_SERVER, 'HTTP_CLIENT_IP', FILTER_VALIDATE_IP)
    ?: filter_input(INPUT_SERVER, 'HTTP_X_FORWARDED_FOR', FILTER_VALIDATE_IP)
    ?: $_SERVER['REMOTE_ADDR']
    ?? '0.0.0.0'; // Or other value fits "not defined" in your logic