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 works for me in Symfony 2.3:

{{ form_row(form.hours,  {   'label': 'Hours:'
                            ,'label_attr': {'class': 'MYCLASSFOR_LABEL'}
                            ,'attr': {'class': 'MYCLASSFOR_INPUTS'} 
                        }
           )
}}