WordPress WP_Term_Query 只取第一層分類或指定分類的字層分類

WP_Term_Query 只取第一層分類

只取得第一層分類，初始化參數中parent為0即可

$args = array(
  'taxonomy' => 'category',
  'orderby' => 'name',
  'order' => 'ASC',
  'parent' => 0,
  'hide_empty' => false,
);
$the_query = new WP_Term_Query($args);
$categories = $the_query->get_terms();
print_r($the_query);
exit;