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I want to alter the User login form of drupal 7. I want only two fields Email ID and password. I don't want a username field. Please any one have idea to how to do these changes in User login form.

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In order to delete the field in a form you have to print the form either using dpm($form) or print_r($form) and there you will get the field of username use that field to unset in form_alter .

function hook_form_alter(&$form, &$form_state, $form_id){

  if (form_id=="Your_form_id"){

      unset($form['the_field_you_dont_want']);

        }
   }
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    If it's an answer to the question. Please add some description to it. Dec 23, 2014 at 12:00
  • Thank you sir for your suggestion but I am new in drupal development. So plz tell me in which file i have to dump the variable $form. Dec 25, 2014 at 7:53

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