$finder->findByPk($primaryKey); $finder->findByPk($key1, $key2, ...); $finder->findByPk(array($key1,$key2,...));
public function findByPk($keys) { if ($keys === null) { return null; } if (func_num_args() > 1) { $keys = func_get_args(); } $data = $this->getRecordGateway()->findRecordByPK($this, $keys); return $this->populateObject($data); }