function addCriteriaList($list_id)
{
$search = $this->getSearch();
$listSet = new BlastSubscription_Set($this->dbcon);
$listSet->setIdFieldLookups('listid');
$listSet->addCriteriaList($list_id);
$this->addCriteria($search->getRelatedSetCriteria($listSet, 'userid'));
}
/**
* Checks to se if a subscriber is subscribed to a list.
*
* @ingroup phplist_subscribers
* @param $id The id value of the subscriber.
* @param $lid The id value of the list.
* @return boolean true is the user is subscribed to the list.
*/
function is_subscribed($user_id, $list_id)
{
$subSet = new BlastSubscription_Set($this->_dbcon);
$subSet->addCriteriaUser($user_id);
$subSet->addCriteriaList($list_id);
$subSet->readData();
return $subSet->hasData();
}
