thinkPHP의 다차원 배열 순회 방법

$drug=array(
  'ACEI'=>array(array('ch_name'=>'本站','en_name'=>'captopril'),array('ch_name'=>'脚本下载','en_name'=>'enalapril'),
    array('ch_name'=>'赖诺普利','en_name'=>'lisinopril')),
  'ARB'=>array(array('ch_name'=>'脚本源码','en_name'=>'eprosartan'), array('ch_name'=>'jb51','en_name'=>'candesartan'),
   array('ch_name'=>'PHP学习','en_name'=>'losartan'),array('ch_name'=>'JS学习','en_name'=>'valsartan'),
   array('ch_name'=>'脚本教程','en_name'=>'irbesartan')),
);

<foreach name="drugs" item="vo" key="k">
  <label>
   <input type="checkbox" name="{$k}" value="1">{$k}
  </label>
   <foreach name="vo" item="drug">
   <label>
    <input type="checkbox" name="{$drug.en_name}" value="1">{$drug.ch_name}
   </label>
   </foreach>
</foreach>