名称： product_categorys
功能：读取所有商品分类列表，多级菜单菜单自动格式化为树形结构
代码示例：
{if($product_categorys)}
<ul class="list-group margin-bottom-25 sidebar-menu">
{loop $product_categorys $k1 $v1}
<li class="list-group-item clearfix {if($v1['children'])}dropdown {if(array_key_exists($k1, $category_info['fatherTree']))}active{/if}{/if}">
<a href="{if($v1['children'])}javascript:void(0);{else}{$v1['category_url']}{/if}" class="{if($v1['children'])}collapsed{/if}">
<i class="fa fa-angle-right"></i> {$v1['cat_name']}
{if($v1['children'])}<i class="fa fa-angle-down"></i>{/if}
</a>
{if($v1['children'])}
<ul class="dropdown-menu" style="display:block;">
{loop $v1['children'] $k2 $v2}
<li class="list-group-item dropdown {if($v2['children'])}dropdown {if(array_key_exists($k2, $category_info['fatherTree']))}active{/if}{/if}">
<a href="{if($v2['children'])}javascript:void(0);{else}{$v2['category_url']}{/if}" class="">
<i class="fa fa-circle"></i> {$v2['cat_name']}
{if($v2['children'])}<i class="fa fa-angle-down"></i>{/if}
</a>
{if($v2['children'])}
<ul class="dropdown-menu" style="display:{if(array_key_exists($v2['cat_id'], $category_info['fatherTree']))}block{else}none{/if};">
{loop $v2['children'] $k3 $v3}
<li class="list-group-item dropdown clearfix {if(array_key_exists($k3, $category_info['fatherTree']))}active{/if}">
<a href="{if($v3['children'])}javascript:void(0);{else}{$v3['category_url']}{/if}">
<i class="fa fa-circle"></i> {$v3['cat_name']}
{if($v3['children'])}<i class="fa fa-angle-down"></i>{/if}
</a>
{if($v3['children'])}
<ul class="dropdown-menu">
{loop $v3['children'] $k4 $v4}
<li><a href="{$v4['category_url']}"><i class="fa fa-circle"></i> {$v4['cat_name']}</a></li>
{/loop}
</ul>
{/if}
</li>
{/loop}
</ul>
{/if}
</li>
{/loop}
</ul>
{/if}
</li>
{/loop}
{/if}数据格式打印： Array
(
[1] => Array
(
[cat_id] => 1
[category] => top_menu
[parent_id] => 0
[unique_id] => 女士
[cat_name] => 女士
[title] => 女士服装包鞋帽
[keywords] => 女士,女装,女鞋,女包,女帽
[description] =>
[content] =>
[sort] => 1
[category_url] => /女士/p1-products.html
[children] => Array
(
[2] => Array
(
[cat_id] => 2
[category] => top_menu
[parent_id] => 1
[unique_id] => 女装
[cat_name] => 女装
[title] => 女装
[keywords] => 女装
[description] => 女装
[content] =>
[sort] => 0
[category_url] => /女装/p1-products.html
[children] => Array
(
[13] => Array
(
[cat_id] => 13
[category] => top_menu
[parent_id] => 2
[unique_id] => 女士T恤
[cat_name] => 女士T恤
[title] => 女士T恤
[keywords] => 女士T恤
[description] => 女士T恤
[content] =>
[sort] => 3
[category_url] => /女士T恤/p1-products.html
)
[14] => Array
(
[cat_id] => 14
[category] => top_menu
[parent_id] => 2
[unique_id] => 女士针织衫
[cat_name] => 女士针织衫
[title] => 女士针织衫
[keywords] => 女士针织衫
[description] => 女士针织衫
[content] =>
[sort] => 3
[category_url] => /女士针织衫/p1-products.html
)
)
)
)
)
[42] => Array
(
[cat_id] => 42
[category] => top_menu
[parent_id] => 0
[unique_id] => 儿童
[cat_name] => 儿童
[title] => 儿童
[keywords] => 儿童
[description] =>
[content] =>
[sort] => 0
[category_url] => /儿童/p1-products.html
)
) 模板示例截图：