Display Sub-categories or Child Pages of Parent Cat/Page?

Question

I am seeking two codes which I haven't been able to find which would allow a child menu to be created in a sidebar.

A code to display the sub-categories of the parent category.

A code to display the sub-pages of the current page.

I remember having a theme that had these codes implemented which also allowed styling to be applied to current categories. Maybe it has since been depreceated and maybe not - but I would sure appreciate if anybody had more information on these codes.

Answer 1

for sub-pages of current page check wp_list_pages()

<?php 
  $page_id = get_the_ID();
  wp_list_pages( array( 'child_of'=>$page_id ) );
?> 

---

and for sub-categories of the parent category check wp_list_categories()

<?php 
$cat_id = get_query_var('cat');
if( !empty($cat_id) ) {
  wp_list_categories( array( 'child_of'=> $cat_id ) );
}
?>