在我进行了一点挖掘之后，我在家长主题中找到了正确的行动。函数看起来是这样的（实际上正是示例Ilinked 以上内容）：

//////////////////////////////
// Add page category filter //
//////////////////////////////

add_action(\'restrict_manage_posts\', \'uncode_page_filter_post_type_by_taxonomy\');

function uncode_page_filter_post_type_by_taxonomy() {
    global $typenow;
    $post_type = \'page\'; // change to your post type
    $taxonomy  = \'page_category\'; // change to your taxonomy
    if ($typenow == $post_type) {
        $selected      = isset($_GET[$taxonomy]) ? $_GET[$taxonomy] : \'\';
        $info_taxonomy = get_taxonomy($taxonomy);
        wp_dropdown_categories(array(
            \'show_option_all\' => sprintf(esc_html__("Show All %s", \'uncode\'), $info_taxonomy->label),
            \'taxonomy\'        => $taxonomy,
            \'name\'            => $taxonomy,
            \'orderby\'         => \'name\',
            \'selected\'        => $selected,
            \'show_count\'      => true,
            \'hide_empty\'      => true,
        ));
    };
}

add_filter(\'parse_query\', \'uncode_page_convert_id_to_term_in_query\');
function uncode_page_convert_id_to_term_in_query($query) {
    global $pagenow;
    $post_type = \'page\'; // change to your post type
    $taxonomy  = \'page_category\'; // change to your taxonomy
    $q_vars    = &$query->query_vars;
    if ( $pagenow == \'edit.php\' && isset($q_vars[\'post_type\']) && $q_vars[\'post_type\'] == $post_type && isset($q_vars[$taxonomy]) && is_numeric($q_vars[$taxonomy]) && $q_vars[$taxonomy] != 0 ) {
        $term = get_term_by(\'id\', $q_vars[$taxonomy], $taxonomy);
        $q_vars[$taxonomy] = $term->slug;
    }
}

/**
 * Remove page_category filter and parse query
 *
 **/
remove_action(\'restrict_manage_posts\', \'uncode_page_filter_post_type_by_taxonomy\');
remove_action(\'parse_query\', \'uncode_page_convert_id_to_term_in_query\');