正如@bonger所评论的，不管你读了什么，都没有自定义的post类型过滤器。

要将此筛选器用于特定的帖子类型，最好的方法是使用post_row_actions 过滤，然后根据传入的$post->post_type.

我使用下面的代码为特定的帖子类型（在本例中为myposttype）添加到actions行的链接。

这将需要进行编辑，以适合您自己的帖子类型，显然，新链接需要更多的代码来实际执行任何操作，但这是一个想法：

function my_duplicate_post_link($actions, $post)
{
    if ($post->post_type==\'myposttype\')
    {
        $actions[\'duplicate\'] = \'<a href="#" title="" rel="permalink">Duplicate</a>\';
    }
    return $actions;
}
add_filter(\'post_row_actions\', \'my_duplicate_post_link\', 10, 2);

//Post, page or all register custom post types

function im_duplicate_post_link($actions, $post)
{
    // get all post type which is register
    $posttypes = get_post_types(array(\'public\' => true), \'names\', \'and\');
    foreach ($posttypes as $post_type)
    {
        $posttype[] = $post_type;
    }
    //check current post type is in "$posttype"  array, if it\'s in array then display duplicate link.
    if (in_array($post->post_type, $posttype))
    {
        $actions[\'duplicate\'] = \'<a href="admin.php?action=im_duplicate_post_as_draft&amp;post=\' . $post->ID . \'" title="Duplicate this item" rel="permalink">Duplicate</a>\';
    }
    return $actions;
}
// this hook for post and custom post type
add_filter(\'post_row_actions\', \'im_duplicate_post_link\', 10, 2);
// this hook for page
add_filter(\'page_row_actions\', \'im_duplicate_post_link\', 10, 2);