Symfony2, How to make a form label class/attr different than its input?

Question

I would like to build a form with label and inputs, but the class of them should be different. Code below creates the label for the input with same attr:

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Answer 1

As mentioned in the documentation:

• attr : A key-value array that will be rendered as HTML attributes on the field
• label_attr: A key-value array that will be rendered as HTML attributes on the label

You can set those attributes in twig template or in form builder:

Twig template:

• for symfony 2.1 and newer use:

  {{ form_label(form.hours, null, {'label_attr': {'class': 'foo'}}) }}
  

• in the legacy symfony 2.0 it used to be

  {{ form_label(form.hours, { 'label_attr': {'class': 'MYCLASSFOR_LABEL'} }) }}
  {{ form_widget(form.hours, { 'attr': {'class': 'MYCLASSFOR_INPUTS'} }) }}
  

Form builder

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('hours', null, array(
        'label_attr' => array('class' => 'MYCLASSFOR_LABEL'),
        'attr'       => array('class' => 'MYCLASSFOR_INPUTS'),
    ));
}