您需要使用manage_posts_extra_tablenav 过滤器，但您可以使用wp_dropdown_categories() 作用

唯一的两个$args 你真正感兴趣的是depth 和taxonomy, 但我已经包括了下面所有的默认值。

完整的详细信息wp_dropdown_categories() function can be found in the Codex

add_filter(\'manage_posts_extra_tablenav\', \'my_add_category_dropdown\');
function my_add_category_dropdown(){

    $args = array(
        \'show_option_all\'    => \'\',
        \'show_option_none\'   => \'\',
        \'option_none_value\'  => \'-1\',
        \'orderby\'            => \'ID\', 
        \'order\'              => \'ASC\',
        \'show_count\'         => 0,
        \'hide_empty\'         => 1, 
        \'child_of\'           => 0,
        \'exclude\'            => \'\',
        \'echo\'               => 1,
        \'selected\'           => 0,
        \'hierarchical\'       => 0, 
        \'name\'               => \'cat\',
        \'id\'                 => \'\',
        \'class\'              => \'postform\',
        \'depth\'              => 0,
        \'tab_index\'          => 0,
        \'taxonomy\'           => \'category\',
        \'hide_if_empty\'      => false,
        \'value_field\'        => \'term_id\',  
    );
    wp_dropdown_categories($args);

}