The best way to display taxonomies

Question

I have a custom hierarchical taxonomy named custom_taxonomy. For example:

Term 1

• term 1_1
• term 1_2
• term 1_3

Term 2

• term 2_1
• term 2_2
• term 2_3

I want to display them on the post page as like in example above: name of parent taxonomy and all its childs, then another parent taxonomy and all childs of this one.

Could you please advice the best way to do this. I thought to take only parents taxonomies via get_terms and then through the loop take childs elements by get_terms or get_term_children. Only one thing, I don't know how to display only terms related to current post in this case.

Answer 1

This has been already answered here

Both the loops needs to exist and you can display it however you like.

foreach( get_terms( 'products-category', array( 'hide_empty' => false, 'parent' => 0 ) ) as $parent_term ) {
  // display top level term name
  echo $parent_term->name . '<br>';

  foreach( get_terms( 'products-category', array( 'hide_empty' => false, 'parent' => $parent_term->term_id ) ) as $child_term ) {
    // display name of all childs of the parent term
    echo $child_term->name . '<br>';
  }

}