异常分类

屏幕快照 2017-05-08 下午2.58.50.png

异常是按照层级处理的，如何a调用b，在b中发生异常，正常流程是b会把异常抛给a，a如果也有try捕获异常操作，便会在a中处理。下面基于RestFul API 给客户端返回正常的错误码格式来粗略讲解异常处理机制。

• 控制器文件：

<?php
/**
 * Created by PhpStorm.
 * User: chenzhitao
 * Date: 2017/5/7
 * Time: 下午1:49
 */

namespace app\api\controller\v1;
use app\api\validate\IDMustBePositiveInt;
use think\Exception;
use think\Validate;
use app\api\model\Banner as BannerModel;

class Banner
{
    public function getBanner($id){

        (new IDMustBePositiveInt())->goCheck();
        try{
            $banner = BannerModel::getBannerByID($id);
        }catch (Exception $e){
            $error = [
                'error_code'=>10001,
                'msg'=>$e->getMessage(),

            ];
            return json($error,400);
        }

        return $banner;



    }

}

• model文件，自制1/0异常，发现并抛出异常

<?php
/**
 * Created by PhpStorm.
 * User: chenzhitao
 * Date: 2017/5/8
 * Time: 下午2:15
 */

namespace app\api\model;


use think\Exception;

class Banner
{
    public static function getBannerByID($id){
        //TODO:根据banner ID号,获取Banner信息
        try{
            1 / 0;
        }catch (Exception $e){
            //TODO 记录日志
            throw $e;
        }
        return 'this is banner';
    }
}

• 客户端返回结果
  {"error_code":10001,"msg":"Division by zero"}