回到 philosopherbios pick theme 任务

当安装程序检查自己的状态，它发现当前任务仍然是philosopherbios_pick_theme，因此它将再次调用philosopherbios_profile_tasks() 函数，这一次 $task 的值为philosopherbios_pick_theme。

让我们回到 profile 任务函数，看一看第二条 if 语句：

/**
 * Walk through final installation tasks
 */
function philosopherbios_profile_tasks(&$task, $url) {
  if ($task == 'profile') {
    // ... Other stuff....
    // Do the form:
    $task = 'philosopherbios_pick_theme';
    $form = drupal_get_form('philosopherbios_theme_form', $url);
    return $form;
  }
  if ($task == 'philosopherbios_pick_theme') {
    $form = drupal_get_form('philosopherbios_theme_form', $url);
    // See if the form was processed:
    if (variable_get('philosopherbios_theme', false)) {
      variable_del('philosopherbios_theme');
      $task = 'profile-finished';
    }
    else {
      return $form; // try again.
    }
  }
}