WordPress统计当前日志中所有的附件错误怎么解决

$args = array(
    'post_parent' => $post->ID,
    'post_type' => 'attachment',
    'post_mime_type' => 'image',
    'posts_per_page' => -1,
    'orderby' => 'menu_order',
    'order' => 'ASC',
);

$attachments = get_posts( $args );

add_action('save_post', 'save_post_my_func', 10 , 2);

function save_post_my_func() {
    global $wpdb;

    $content = $post->post_content;
    if (!stristr($content, '/wp-content/uploads/'))
    {
        // 如果说当前日志中没有任何附件链接，我将这个字段更新为空
        update_post_meta($post_id, '_wp_post_attach_total_', '');
        return ;
    }

    $data = array();
    if (preg_match_all('/(href|src)=[^>]+/wp-content/uploads/(sites/d+/)?([^"'>s]+)["'>s]/is', $content, $match))
    {
        // 统计所有带有附件链接的img还有link
        $files = array_flip(array_flip($match[3]));
        $sql = sprintf("SELECT `post_id` FROM `%s` WHERE `meta_key`='_wp_attached_file' AND (`meta_value`='%s');",
                        $wpdb->postmeta, implode("' OR `meta_value`='", $files));

        (FALSE != ($row = $wpdb->get_col($sql))) && $data = $row;
    }

    // 统计日志中的相册
    if (preg_match_all('/?)([^"']]*)1s*]/is', $content, $gallery))
    {
        $where = array();
        $gallery = explode(',', implode(',', $gallery[2]));
        foreach ($gallery as $val)
        {
            $where[] = '`post_id`='.trim($val);
        }

        $sql = sprintf("SELECT `post_id` FROM `%s` WHERE `meta_key`='_wp_attached_file' AND (%s);", $wpdb->postmeta, implode(' OR ', $where));
        (FALSE != ($row = $wpdb->get_col($sql))) && $data = array_merge($data, $gallery);
    }

    // 统计当前日志中的缩略图
    if (FALSE != ($thumb_id = get_post_meta($post_id, '_thumbnail_id')))
    {
        $data[] = $thumb_id[0];
    }

    // 为了后续扩展，以及向其他应用开放扩展，这里我创建了一个过滤钩子
    $data = apply_filters('wp_post_attach_total', $data, $post_id);
    if (!empty($data))
    {
        $data = array_flip(array_flip($data));
        update_post_meta($post_id, '_wp_post_attach_total_', implode(',', $data));
    }
}

get_post_meta($post_id, '_wp_post_attach_total_');