function isValid() { $file_id = $this->property_info['id'] . "_" . $this->object_sid; $this->property_info['value'] = $file_id; $upload_manager = new SJB_UploadPictureManager(); if ($upload_manager->isValidUploadedPictureFile($this->property_info['id'])) { return true; } return $upload_manager->getError(); }