/**
* Retrieve a unique identifier for object instance
* @param mixed $object
* @return string
*/
protected static function identify($object)
{
foreach (self::$uids as $uid => $e) {
if ($e === $object) {
return $uid;
}
}
$uid = Identifier::identify($object);
self::$uids[$uid] = $object;
return $uid;
}
