Get second level terms of custom taxonomy

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I want to get second level terms of a specific parent (first-level) term in a custom taxonomy. Sounds complicated but would be useful. 

Term 1
   SubTerm-1.1
   SubTerm-1.2
       SubTerm-1.2.1
Term 2
   SubTerm-2.1

Say, if SubTerm->parent is Term 1’s id, then i want to output SubTerm 1.1 and 1.2 but not 1.2.1.

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wp_list_categories(array('depth' => 2, 'taxonomy' => 'customtax')); is not i’m looking for as it lists terms with their links, which i dont want to, and there is no filtering option by SubTerm->parent id.

So any idea?

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2 comments

  1. You can use PHP’s array_filter to process the results of a taxonomy query function that returns its results, and then display them. Something like:

    # This returns the whole taxonomy...
$whole_tax = get_terms('customtax', array('hide_empty' => 0));
$second_level = array_filter($whole_tax, function ($t) {
  # This term has a parent, but its parent does not.
  return $t->parent != 0 && get_term($t->parent, 'customtax')->parent == 0;
});

    At this point you can render $second_level to output in whatever format you want.

    NB. If this is often used on a busy side should avoid all those extra get_term calls by reading from the $whole_tax array assuming the documentation’s statement that get_term always hits the database when passed an id.

  2. $tax ='taxonomy';
        $args = array(
          'taxonomy' => $tax,
          'hide_empty' => false,
          'parent' => 0,
          );
    $toplv_term_query = new WP_Term_Query($args);
        foreach($toplv_term_query->get_terms() as $toplv_term){
             $args = array(
               'taxonomy' => $tax,
               'hide_empty' => false,
               'parent' => $toplv_term->term_id,
              );
          $secondlv_term_query = new WP_Term_Query($args);
              foreach($secondlv_term_query->get_terms() as $secondlv_term){
                   $secondlv_term->term_id;

             }
        }