Symfony - checkboxtype

i have problem with checkboxtype in symfony framework. My code for creation form is:

$form = $this->createFormBuilder()
            ->add('table_records', CheckboxType::class)
            ->add('save', SubmitType::class, array('label' => 'delete'))
            ->getForm();

My problem is array in checkbox, because i need checkboxname for example table_records[], for many checkboxes.