php – Drupal with Hierarchical Select小部件中Content Classi

foreach (element_children($form) as $child) {
// Set $default_value.

  if ($form[$child]['tids']) {
// This,for Content Taxonomy fields,isn't working:
    $form[$child]['tids']['#default_value'] = array('value' => $default_value);
    dsm($form[$child]['tids']['#default_value']);
  }
  else {
// This,for other fields,is working:
    $form[$child][0]['#default_value']['value'] = $default_value;
  }
}

谁能告诉我我错过了什么？

编辑：
为了回应Henrik Opel(感谢您的参与),这里是打印出表单的相关字段,我对默认字段的更改被注释掉,显示我试图影响的’#default_value’字段.

它还显示我正在使用的选项小部件是分层选择(这可能是一个因素？).在上面代码中的dsm()中,将识别对默认值的更改,但稍后不会对它们进行处理.

field_name_of_content_taxonomy_field (Array,3 elements)
  #tree (Boolean) TRUE
  #weight (String,1 characters ) 5
  tids (Array,7 elements)
    #title (String,10 characters ) Vocabulary_name
    #type (String,19 characters ) hierarchical_select
    #weight (String,1 characters ) 5
    #config (Array,15 elements)
      // 15 elements here
    #required (String,1 characters ) 0
    #description (String,0 characters )
    #default_value (Array,0 elements)