<?phpnamespace Vich\UploaderBundle\Metadata;use Metadata\ClassMetadata as BaseClassMetadata;class ClassMetadata extends BaseClassMetadata{ /** @var array */ public $fields = []; public function serialize(): string { return \serialize([ $this->fields, parent::serialize(), ]); } public function unserialize($str): void { [ $this->fields, $parentStr ] = \unserialize($str); parent::unserialize($parentStr); }}