点赞接口

//新闻点赞
public function praise()
{
    if (!is_login()) {
        $this->returnBack(2, '请先登录');
    }
    $id = I('post.jour_id');   //新闻id
    $type = I('post.type');  //点赞状态
    $article = M('app_journalism')->field('praise')->where(['id' => $id])->find();

    if ($article) {
        if ($type == 1) {
            $praise = M('app_jour')->field('id')->where(['jour_id' => $id, 'user_id' => $_SESSION['onethink_home']['user_auth']['uid']])->find();

            if ($praise) {
                $this->returnBack(1, '您已经点赞过了');
            }
            $re = M('app_jour')->add(array(
                'user_id' => $_SESSION['onethink_home']['user_auth']['uid'],
                'jour_id' => $id,
                'starttime' => time(),
            ));
            $praise = $article['praise'] + 1;
        } elseif ($type == 2) {
            $re = M('app_jour')->where(['user_id' => $_SESSION['onethink_home']['user_auth']['uid'], 'article_id' => $id])->delete();
            $praise = $article['praise'] - 1;
        }

        if ($re) {
            M('app_journalism')->where(['id' => $id])->save(['praise' => $praise]);
            $this->returnBack(0, '成功', array('num' => $praise));
        }
    }
    $this->returnBack(1, '失败');
}