/**
* Return an array of stored cache ids which match any given tags
*
* In case of multiple tags, a logical OR is made between tags
*
* @param array $tags array of tags
* @return array array of any matching cache ids (string)
*/
public function getIdsMatchingAnyTags($tags = array())
{
if ($tags) {
return (array) $this->_redis->sUnion($this->_preprocessTagIds($tags));
}
return array();
}