我突然在需要使用的時候發現我竟然沒有寫下：
<?php
/**
* hook_form_alter()
*/
function hook_form_alter(&$form, &$form_state)
{
// callback
$form['actions']['submit']['#submit'][] = 'custom_checkin_redirect';
}
/**
* callback
*/
function custom_checkin_redirect($form, &$form_state)
{
$form_state['redirect'] = 'check-in'; // any url works here
}
?>