Show users IP in a graphic - PHP Script

From: http://www.allscoop.com/phpcode.php

$img_number = imagecreate(275,25);
$backcolor = imagecolorallocate($img_number,102,102,153);
$textcolor = imagecolorallocate($img_number,255,255,255);

imagefill($img_number,0,0,$backcolor);
$number = " Your IP is $_SERVER[REMOTE_ADDR]";

Imagestring($img_number,10,5,5,$number,$textcolor);

header("Content-type: image/jpeg");
imagejpeg($img_number);