gistfile1.txt

<?php

/* Include the files/set up autoloading */

$packer = new Sprite_Packer_Greedy_Heap();
$map = new Sprite_Map($packer);

$images = array();
$images[] = new Sprite_Image_Url('http://static.reddit.com/reddit.com.header.png');
$images[] = new Sprite_Image_Url('http://static.php.net/www.php.net/images/php.gif');

foreach ($images as $img) {
  $map->addImage($img);
}

var_dump($map->getBlocks());
imagepng($map->getImage(), 'out.png');