我有文件搜索表。php搜索。phpadv搜索。包含下拉列表类别的php和显示下拉列表的代码是。。。

enter code here$args = array(                                           
                     \'child_of\' => $current_term->term_id,
\'taxonomy\' => $current_term->taxonomy,
\'hide_empty\' => 0,
\'hierarchical\' => true,
\'depth\'  => 0,
\'title_li\' => \'\',
    \'show_option_all\' => All,
    \'hide_if_empty\' => true,

                );
                wp_dropdown_categories($args);