Ensure Two of the Same Value

This can be a useful bit of code to ensure that two fields are filled in with the same value (such as two email address that must match).

Create two e-mail components with the field keys 'email1' and 'email2'. Then in the "Webform advanced settings" fieldset, enter this code into the Additional validation text field.

  if ($form_values['submitted_tree']['email1'] != $form_values['submitted_tree']['email2']) {
    form_set_error('submitted][email1', t('E-mail addresses must match.'));
  }