/**
* @param string photo-id
* @return FlickrPhoto[] key 'prev' = previous photo, key 'next' = next photo
*/
public function getContext($photo_id)
{
if (!isset($this->context_cache[$photo_id])) {
$res = FlickrService::$instance->call('flickr.photosets.getContext', array('photoset_id' => $this->id, 'photo_id' => $photo_id, 'extras' => FlickrPhoto::$std_extras));
$ctx = array('prev' => FlickrPhoto::valueOf($res->dom['prevphoto'][0]), 'next' => FlickrPhoto::valueOf($res->dom['nextphoto'][0]));
$this->context_cache[$photo_id] =& $ctx;
return $ctx;
} else {
return $this->context_cache[$photo_id];
}
}
/**
* @param array
* @return FlickrPhoto[]
*/
public static function valueOfCollection(&$a)
{
$photo_count = count($a);
$photos = array();
for ($i = 0; $i < $photo_count; $i++) {
$photos[] = FlickrPhoto::valueOf($a[$i]);
}
return $photos;
}
