thinkPHP5实现的查询数据库并返回json数据实例

{
"code":0,
"msg":"\u6570\u636e\u8fd4\u56de\u6210\u529f",
"count":1000,
"data":[{"id":617,
"title":"\u5317\u4eac\u7406\u5de5\u5927\u5b66",
"flid":1,
"pid":0,"uid":1,
"price":0,
"admin_name":null,
"time":"2017-09-22 16:17:16"},
{
"id":618,"title":"\u5357\u5f00\u5927\u5b66",
"flid":1,"pid":0,"uid":1,"price":0,"admin_name":null,
"time":"2017-09-22 16:17:28"}]}

function json($code,$msg="",$count,$data=array()){
  $result=array(
   'code'=>$code,
   'msg'=>$msg,
   'count'=>$count,
   'data'=>$data
  );
  //输出json
  echo json_encode($result);
  exit;
}

<?php
namespace app\admin\controller;
use think\Controller;
use think\Validate;
use think\Request;
//use think\Db;
class Main extends controller
{
  public function index()
  {
    return $this -> fetch();
  }
//学校列表
  public function school()
  {
    $rs=db('school')->select();
    $rs1=json(0,'数据返回成功',1000,$rs);
    dump($rs1);die;//打印出来
    return $this -> fetch();
  }