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

This may be new, but there's an easy way to do this now:

$builder
    ->add('hours', null , array(
        'attr'=> 
            array(
                'placeholder'=>'Working Hours',
                'class'=>'MYCLASSFOR_INPUTS') 
        ) ,
        'label_attr' => array(
            'class' => 'MYCLASSFOR_LABEL'
        )
    );

The option you're looking for is label_attr.