获取当前分类页面的二级分类和三级分类

二级分类

<?php
function get_immediate_child_terms($term_id, $taxonomy) {
    return get_terms([
        'taxonomy' => $taxonomy,
        'hide_empty' => true,
        'parent' => $term_id,
        'orderby' => 'name', // Optional: order alphabetically
        'order' => 'ASC'
    ]);
}

// In taxonomy.php
$current_term = get_queried_object();
$level_2_terms = get_immediate_child_terms($current_term->term_id, $current_term->taxonomy);

// More detailed rendering
if (!empty($level_2_terms)) {
    echo '<div class="taxonomy-children">';
    foreach ($level_2_terms as $term) {
        // Additional term details
        echo '<div class="term-item">';
        echo '<h4><a href="' . get_term_link($term) . '">' . $term->name . '</a></h4>';
        echo '<p>Posts in this category: ' . $term->count . '</p>';
        echo '</div>';
    }
    echo '</div>';
}
?>

三级分类

<?php
function get_nested_child_terms($term_id, $taxonomy, $current_depth = 1, $max_depth = 3) {
    if ($current_depth > $max_depth) return [];

    $child_terms = get_terms([
        'taxonomy' => $taxonomy,
        'hide_empty' => true,
        'parent' => $term_id,
    ]);

    $nested_terms = [];
    foreach ($child_terms as $child_term) {
        $child_term->children = get_nested_child_terms(
            $child_term->term_id, 
            $taxonomy, 
            $current_depth + 1, 
            $max_depth
        );
        $nested_terms[] = $child_term;
    }

    return $nested_terms;
}

// Usage in taxonomy.php
$current_term = get_queried_object();
$level_3_terms = get_nested_child_terms($current_term->term_id, $current_term->taxonomy);