查看WP 3.3.2的代码，似乎trash_post 实际上是wp_trash_post. 从wp_trash_post() 中的函数/wp-includes/post.php:

do_action(\'wp_trash_post\', $post_id);

add_post_meta($post_id,\'_wp_trash_meta_status\', $post[\'post_status\']);
add_post_meta($post_id,\'_wp_trash_meta_time\', time());

$post[\'post_status\'] = \'trash\';
wp_insert_post($post);

wp_trash_post_comments($post_id);

do_action(\'trashed_post\', $post_id);

但是，有一个钩子可以用来检测用户何时恢复帖子。它的名字很贴切untrash_post.

在这里，它是从同一个核心文件执行的：

function wp_untrash_post($post_id = 0) {
    if ( !$post = wp_get_single_post($post_id, ARRAY_A) )
        return $post;

    if ( $post[\'post_status\'] != \'trash\' )
        return false;

    do_action(\'untrash_post\', $post_id);

    $post_status = get_post_meta($post_id, \'_wp_trash_meta_status\', true);

    $post[\'post_status\'] = $post_status;

    delete_post_meta($post_id, \'_wp_trash_meta_status\');
    delete_post_meta($post_id, \'_wp_trash_meta_time\');

    wp_insert_post($post);

    wp_untrash_post_comments($post_id);

    do_action(\'untrashed_post\', $post_id);

    return $post;
}