/**
* @return boolean whether the dependency has changed.
*/
public function getHasChanged()
{
$tags = array_map(function($i) { return FileCache::PREFIX.$i; }, $this->tags);
$values = Y::cache()->mget($tags);
foreach ($values as $value) {
if ((integer)$value > $this->timestamp) { return true; }
}
return false;
}