thinPHP中多维数组的遍历

$drug=array(
   "ACEI"=>array(array("ch_name"=>"卡托普利","en_name"=>"captopril"),array("ch_name"=>"依那普利","en_name"=>"enalapril"),
       array("ch_name"=>"赖诺普利","en_name"=>"lisinopril")),
   
   "ARB"=>array(array("ch_name"=>"依普罗沙坦","en_name"=>"eprosartan"), array("ch_name"=>"坎地沙坦","en_name"=>"candesartan"),
      array("ch_name"=>"氯沙坦","en_name"=>"losartan"),array("ch_name"=>"缬沙坦","en_name"=>"valsartan"),
      array("ch_name"=>"厄贝沙坦","en_name"=>"irbesartan")),
  );

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