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   2. drupal7

Login form _validate hook

Code

modules/openid/openid.module, line 141

<?php
function openid_login_validate($form, &$form_state) {
  $return_to = $form_state['values']['openid.return_to'];
  if (empty($return_to)) {
    $return_to = url('', array('absolute' => TRUE));
  }

  openid_begin($form_state['values']['openid_identifier'], $return_to, $form_state['values']);
}
?>