利用smarty call函数实现无限极分类

定义一个function
{function name=menu level=0}
  <ul class="level{$level}">
  {foreach $data as $entry}
    {if is_array($entry)}
      <li>{$entry@key}</li>
      {call name=menu data=$entry level=$level+1}
    {else}
      <li>{$entry}</li>
    {/if}
  {/foreach}
  </ul>
{/function}

创建一个测试数组
{$menu = [‘item1‘,‘item2‘,‘item3‘ => [‘item3-1‘,‘item3-2‘,‘item3-3‘ =>
[‘item3-3-1‘,‘item3-3-2‘]],‘item4‘]}

运行call
{call name=menu data=$menu}
{call menu data=$menu} {* short-hand *}

* item1
* item2
* item3
      o item3-1
      o item3-2
      o item3-3
            + item3-3-1
            + item3-3-2
* item4