Elgg-Lorea-Hydra/mod/tidypics/actions/photos/album/sort.php

<?php
/**
 * Sorting album action - takes a comma separated list of image guids
 */

$album_guid = get_input('album_guid');
$album = get_entity($album_guid);
if (!$album) {

}

$guids = get_input('guids');
$guids = explode(',', $guids);

if ($album->setImageList($guids)) {
	system_message(elgg_echo('tidypics:album:sorted', array($album->getTitle())));
} else {
	register_error(elgg_echo('tidypics:album:could_not_sort', array($album->getTitle())));
}

forward($album->getURL());