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i have a custom form validate function. what is the correct/reliable way to get the field value and why? below two lines get the same value from a Select List.

a) $form['field_a']['und']['#value']

b) $form_state['values']['field_a']['und'][0]['value']

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Refering to form API Drupal 7 for #value

$form['field_a']['und']['#value']

Used by: button, hidden, image_button, submit, token, value

Description: Used to set values that cannot be edited by the user.

For $form_state['values']['field_a']['und'][0]['value']

$form_state is one of the arguments passed to a form submission handler, or a form validation handler; its main usage is to retrieve the values entered from the user in the form see the content of $form_state['values'])

So you should use $form_state['values']['field_a']['und'][0]['value']

  • 3
    It would be recommended to use LANGUAGE_NONE constant instead of 'und'. Like this: $form_state['values']['field_a'][LANGUAGE_NONE][0]['value']. If you have translatable fields check this out: drupal.stackexchange.com/questions/25839/… – jiv-e Dec 5 '14 at 21:27

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