humble bundle validator 0.1

<?php

if(!isset($_GET['id'])) exit;

$conti = file_get_contents("http://www.humblebundle.com/?gift=".$_GET['id']);

$im = imagecreate( 500, 20 );
$white = ImageColorAllocate ($im, 255, 255, 255);
$black = ImageColorAllocate ($im, 0, 0, 0);
$red = ImageColorAllocate ($im, 255, 0, 0);

if( strpos($conti,'Gift key already used!') === false ) imagestring( $im, 4, 0, 0, "http://www.humblebundle.com/?gift=".$_GET['id'], $black );
else imagestring( $im, 4, 0, 0, "Key bereits benutzt", $red );
imagesetthickness ( $im, 5 );

header( "Content-type: image/png" );
imagepng( $im );
imagecolordeallocate( $white );
imagecolordeallocate( $black );
imagedestroy( $im );















?>