Wordpress calls all subcategories of the current classification

wordpress When creating enterprise themes, it is common to call all subcategories under the current category. To implement this, follow the steps below.

First, write a function in "functions. php" of the topic. The code is as follows:

 //Get subcategories function get_category_root_id($cat){     $this_category = get_category($cat);     while($this_category->category_parent) {         $this_category = get_category($this_category->category_parent);     }     return $this_category->term_id; }

Then write the following code on the page to be called:

 <? php if(is_category()) {     $cat = get_query_var('cat');     $categoryurl = get_category_link($cat);     if(get_category_children(get_category_root_id(the_category_ID(false)))!=  "" ) {         echo wp_list_categories("child_of=".get_category_root_id(the_category_ID(false)).  "&depth=0&hide_empty=0&title_li=&orderby=id&order=ASC");     } } ?>

Finally, adjust the css by yourself.