Drupal 7 cancel button php

Drupal 7 cancel button


 $form['cancel'] = array(
    '#type' => 'submit',
    '#value' => t('Cancel'),
   '#submit' => array('our_callback_for_cancel_button'),
    '#limit_validation_errors' => array(),
     );
    return $form;
}

function our_callback_for_cancel_button($form, &$form_state) {
  //check whether we have destination to redirect after clicking the cancel button otherwise redirect to front page
  $url = $link = $base_url . '/giftcard';
  drupal_goto($url);
}