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$article_list = $this->model('article')->get_articles_list_by_topic_ids($param, 5, 'add_time DESC', $topic_ids);
$article_list = $this->model('article')->get_articles_list(null, $param, 5, 'add_time DESC');
if ($question_list = $this->model('posts')->get_posts_list('question', $param, 5, 'new', $topic_ids, $category_id))
if ($question_list = $this->model('posts')->get_posts_list(null, $param, 5, 'new', $topic_ids, $category_id))找一下这些行的代码，将5改成8以内的数字。 
