enum Suit:string{case Hearts ='H';case Diamonds ='D';case Clubs ='C';case Spades ='S';}enum Rank:string{case Ace ='A';case King ='K';case Queen ='Q';case Jack ='J';case Ten ='X';case Nine ='9';case Eight ='8';case Seven ='7';case Six ='6';case Five ='5';case Four ='4';case Three ='3';case Two ='2';}finalclass Card{public ?Suit$suit =null;public ?Rank$rank =null;}

$form =$this    ->createFormBuilder(null, ['data_class' => Card::class])    ->add('suit', EnumType::class, ['class' => Suit::class,'required' =>false,'expanded' =>true])    ->add('rank', EnumType::class, ['class' => Rank::class,'required' =>false])    ->add('submit', SubmitType::class)    ->getForm()    ->handleRequest($request);