category和archives调用下级子分类的名称和链接

<?php if ( is_category() ) { $this_category=g et_category( $cat ); } ?>
<?php if ( $this_category->category_parent ) 
$this_category = wp_list_categories( 'orderby=id&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->category_parent."&echo=0" ); 
else $this_category = wp_list_categories( 'orderby=id&depth=1&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->cat_ID."&echo=0" ); 
if ( $this_category ) { ?>
<ul>
<?php echo $this_category; ?>
</ul>
<?php } ?>