global $wpdb;
        $sql = $wpdb->prepare("SELECT link, post_id, comment_fbid FROM {$wpdb->dln_post_link} WHERE is_fetch = %d AND crawl = %d LIMIT 0, 100", 0, 0);
        $result = $wpdb->get_results($sql, ARRAY_A);
        return $result;
    }
    public static function fetch_image_post($post_id = '', $link = '', $comment_fbid = '')
    {
        if (!$post_id || !$link) {
            return;
        }
        $image = '';
        if ($comment_fbid) {
            $app_id = FB_APP_ID;
            $app_secret = FB_SECRET;
            $url = "https://graph.facebook.com/{$comment_fbid}?access_token={$app_id}|{$app_secret}";
            $obj = json_decode(file_get_contents_curl($url));
            if (isset($obj->image) && $obj->image) {
                $image = $obj->image->url;
            }
        }
        var_dump($image);
        die;
        if (!empty($image)) {
            $graph = OpenGraph::fetch($link);
            var_dump($graph);
            die;
        }
    }
}
DLN_Post_Helper::get_instance();