How to display the term_id of a child product category?

Question

WordPress

Good afternoon.
I am inside the product.
It is necessary to display the id of the current category (child, without parent)
There is a code:

<?php global $product; //Если не объявлен ранее. Не уверен в необходимости.
global $post;
$categories = get_the_terms( $post->ID, 'product_cat' );
foreach ($categories as $category) {
    echo $category->term_id; //Может быть в нескольких категориях
}?>

But it displays both the parent and child in which the product is located. And it is necessary ONLY child.

Answer 1

Good afternoon.

$product_cats = wp_get_post_terms(get_the_ID(), 'product_cat');
if ($product_cats) {
  $deepestTerm = false;
  $maxDepth = -1;

  foreach ($product_cats as $cat) {
    $termDepth = count(get_ancestors($cat->term_id, 'product_cat'));

    if ($termDepth > $maxDepth) {
      $deepestTerm = $cat;
      $maxDepth = $termDepth;
    }
  }

  echo $deepestTerm->term_id;
}

Answer 2

Check which categories are listed for the product in the control panel. It often happens that they indicate the entire branch of the tree. Try to leave only the last category in the branch.