IP Function for Google Cloud Function (For Purpose of Upwork Test Only)

get_ip_function.php

<?php

use GuzzleHttp\Psr7\Response;
use Psr\Http\Message\ServerRequestInterface;

function get_ip(ServerRequestInterface $request)
{
    $data = ["ip" => get_client_ip()];

    $queryString = $request->getQueryParams();
    if (isset($queryString['name'])) {
        $data['greeting'] = "Hello, " . $queryString['name'] . "!";
    }

    return new Response(
        200,
        [
            'Content-Type' => 'application/json',
            'x-hello-world' => 'Muhammad A.'
        ],
        json_encode($data)
    );
}

// Function to get the client IP address
function get_client_ip()
{
    $ipaddress = '';
    if (isset($_SERVER['HTTP_CLIENT_IP']))
        $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
    else if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
        $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
    else if (isset($_SERVER['HTTP_X_FORWARDED']))
        $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
    else if (isset($_SERVER['HTTP_FORWARDED_FOR']))
        $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
    else if (isset($_SERVER['HTTP_FORWARDED']))
        $ipaddress = $_SERVER['HTTP_FORWARDED'];
    else if (isset($_SERVER['REMOTE_ADDR']))
        $ipaddress = $_SERVER['REMOTE_ADDR'];
    else
        $ipaddress = 'UNKNOWN';

    return $ipaddress;
}