关于《细说PHP》CMS项目中问题

登录首页：出现这个notice,
Notice: Undefined variable: data in D:\Apache\htdocs\cms_demo\class\Article.class.php on line 125

Notice: Undefined variable: data in D:\Apache\htdocs\cms_demo\class\Article.class.php on line 141

Notice: Undefined variable: data in D:\Apache\htdocs\cms_demo\class\Article.class.php on line 162

Notice: Undefined variable: data in D:\Apache\htdocs\cms_demo\class\Flink.class.php on line 98

我查看了函数中的data, 为什么会告诉我没定义呢？不是明明直接赋值为数组啊。
function getRecommend($catId=0,$offset=0, $num=10){
            if($catId !=0 ){
                $sql = "SELECT id, title,author,postTime,audit FROM {$this->tabName}
                WHERE catId={$catId} and recommend=1  and audit=1 ORDER BY id DESC LIMIT $offset, $num";
            }else{    
                $sql = "SELECT id, title,author,postTime,audit FROM {$this->tabName}
                WHERE recommend=1  and audit=1 ORDER BY id DESC LIMIT $offset, $num";
            }

            $result=$this->mysqli->query($sql);

            while($row=$result->fetch_assoc()){
                $data[]=$row;
            }
            return $data;

而且主页样式也没连上。啥样式没有

楼主你看看你的项目路径,很有可能是路径不对,没加载到样式