June 07, 2017
Get_terms does not natively support exclude children. Here is a function that you can use to help keep your front end organized, and structured.
function is_child($term,$taxonomy) {
$check = get_ancestors($term->term_id,$taxonomy);
if (!empty($check)) { return true;} else { return false;}
}
I found this particularly useful when trying to Sort Posts By Category, and my categories were nested.
Default:
$taxonomy = get_terms('my_custom_taxonomy');
foreach ($taxonomy as $term) {
if (!is_child($term,$taxonomy)) {
// Exclude children from this
}
};
Sort Posts by Category:
//get all categories then display all posts in each term
$taxonomy = 'category';
// $param_type = 'category__in'; no longer in use
$term_args = array(
'orderby' => 'name',
'order' => 'ASC'
);
$terms = get_terms($taxonomy,$term_args);
if ($terms) {
foreach( $terms as $term ) {
if (!is_child($term,$taxonomy)) { // trigger exclude children
$args = array(
'tax_query' => array(array(
'taxonomy' => 'category',
'field' => 'term_id',
'terms' => array($term->term_id), // get the post type term id
)),
'post_type' => 'post',
'posts_per_page' => -1
// 'caller_get_posts'=> 1 DEPRECATED
);
$my_query = null;
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) { ?>
<ul class="category_posts">
<li><a href="<?php the_permalink(); ?>/category/<?php echo $term->slug; ?>">
<?php echo $term->name;?>
</a>
<ul class="children">
<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>
<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endwhile; ?>
</ul>
</li>
</ul>
<?php } // end my_query
} // end if exclude children
} // endforeach
} // end if terms
wp_reset_query(); // Restore global post data stomped by the_post(). ?>
Sourced here.
