Allow/ Disallow certain sites to include my file

I am using the below code to allow websites to use my content.

[code=php]<?php

$game = $_GET[‘game’];
$page = $_GET[‘page’];
$letter = $_GET[‘letter’];
$console = $_GET[‘console’];

if(!$console && !$letter && !$game && !$page) {
include(“http://www.gameslayer.co.uk/cheatserve/serve/default.php?type=content”);
} else {
include(“http://www.gameslayer.co.uk/cheatserve/serve/” . $console . $letter . $game . $page . “.php?type=content”);
}

?>[/code]

I only want to allow pre-approved sites to include my files, using the above code. As it is pre-approval i will need an allow list, and all others to be disallowed.

I’m aware i can use echo $_SERVER[‘HTTP_HOST’]; to find the domain name, which would have to be added to the first code, and possible stored as a variable and then found by the page it includes.

Is this possible?

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