laravel 报错了htmlentities() expects parameter 1 to be string, array given

Question

我从数据库拿出一条数据

$result = DB::select("SELECT SUM(right_wrong) AS sum FROM `hw_student_answers` where hw_paper_id=$paper_id GROUP BY `hw_paper_id`");

然后测试打印结果没有错

我想把结果输出到页面上所以

<td>{{$result}}</td>

结果报错htmlentities() expects parameter 1 to be string, array given，请大神帮我看一下是怎么回事

Answer 1

自己解答，因为没有循环数组