我有一个下拉列表，显示了具有多个级别（子级）的自定义分类法。下面是它的代码。有人能解释一下我如何限制孩子们观看吗？例如，目前它显示：

父->子->子对象的子对象

我只想让它显示：

父->子级

谢谢！：）

function my_dropdown_categories( $taxonomy, $current_selected = \'\', $include = null ) {
// Get all terms of the chosen taxonomy
$terms = get_terms($taxonomy, array(\'orderby\' => \'name\'));

// our content variable
$list_of_terms = \'<select id="location" data-placeholder="Choose your area..."  class="selectboxSingle" name="location">\';

if ( ! is_wp_error( $terms ) ) foreach($terms as $term){

    // If include array set, exclude unless in array.
    if ( is_array( $include ) && ! in_array( $term->slug, $include ) ) continue;

    $select = ($current_selected == $term->slug) ? "selected" : ""; // Note: ==

    if ($term->parent == 0 ) {

        // get children of current parent.
        $tchildren = get_term_children($term->term_id, $taxonomy);

        $children = array();
        foreach ($tchildren as $child) {
            $cterm = get_term_by( \'id\', $child, $taxonomy );
            // If include array set, exclude unless in array.
            if ( is_array( $include ) && ! in_array( $cterm->slug, $include ) ) continue;
            $children[$cterm->name] = $cterm;
        }
        ksort($children);

        // OPTGROUP FOR PARENTS
        if (count($children) > 0 ) {
        //     $list_of_terms .= \'<optgroup label="\'. $term->name .\'">\';
             if ($term->count > 0)

                 $list_of_terms .= \'<option class ="group-result" value="\'.$term->slug.\'" \'.$select.\'>\' . $term->name .\' </option>\';
        } else
            $list_of_terms .= \'<option value="\'.$term->slug.\'" \'.$select.\'>\'. $term->name .\' </option>\';
        //$i++;

        // now the CHILDREN.

        foreach($children as $child) {
          //   $select = ($current_selected == $child->slug) ? "selected" : ""; // Note: child, not cterm
             $list_of_terms .= \'<option value="\'.$child->slug.\'" \'.$select.\'>\'. $child->name.\' </option>\';
        } //end foreach

        if (count($children) > 0 ) {
            $list_of_terms .= "</optgroup>";
        }
    }
}

$list_of_terms .= \'</select>\';

return $list_of_terms;
}