php codeigniter – 表单助手 – 如何在无线电输入上实现set_val

我的表单已创建并验证已实施,所有工作.

我唯一的问题是添加set_value()函数以在发生错误时重新填充表单.

我无法让它在我的无线电输入上工作,如何将set_value()函数添加到无线电类型.

码：

<ul> 
          <li><?php echo form_radio('found_by','newspaper_advert',set_value('found_by')); ?> Newspaper advert</li>
          <li><?php echo form_radio('found_by','press_release',set_value('found_by')); ?> Press release</li>
          <li><?php echo form_radio('found_by','text_message',set_value('found_by')); ?> Text message</li>
          <li><?php echo form_radio('found_by','email',set_value('found_by')); ?> Email</li>
          <li><?php echo form_radio('found_by','refferal',set_value('found_by')); ?> Referred to by a friend</li>
          <li><?php echo form_radio('found_by','telemarketing',set_value('found_by')); ?> Telemarketing</li>
          <li><?php echo form_radio('found_by','leaflet_flyer',set_value('found_by')); ?> Leaflet or flyer</li>
          <li><?php echo form_radio('found_by','radio',set_value('found_by')); ?> Radio</li>
          <li><?php echo form_radio('found_by','television',set_value('found_by')); ?> Television</li>
          <li><?php echo form_radio('found_by','internet_advert',set_value('found_by')); ?> Internet advert</li>
          <li><?php echo form_radio('found_by','search_engine',set_value('found_by')); ?> Search engine</li>
          <li><?php echo form_radio('found_by','none',set_value('found_by')); ?> None of the above</li>
      </ul>