$recommendnews=db('news')->where('news_category','=',$news['news_category'])->order('news_date desc')->select();

想问下where那里要怎么改
完整代码

public function news()
{
$newsid=input('newsid');

$news=db('news')->where('news_id','=',$newsid)->select();

$recommendnews=db('news')->where('news_category','=',$news['news_category'])->order('news_date desc')->select();

$this->assign(array(
'news'=>$news,
'recommendnews'=>$recommendnews,
));

return $this->fetch();
}