class Banner
{
    public static function getBannerById($id)
    {
      try{
          1 / 0;
      }catch (Exception $ex) {
          throw $ex; //使用tp5全局异常
      }
      return 'this is banner info';
    }
}

开启调试模式以查看服务器返回的错误详细信息
application\config.php

return [
  'app_debug' => true
];

此时调用接口将返回

这个异常页面可以清楚看到代码中的哪个地方出错，方便调试代码，但在生产环境下我们则希望返回一个json对象并且记录日志

新建一个异常基类

application\lib\exception\BaseException.php

<?php
namespace app\lib\exception;
use think\Exception;

class BaseException extends Exception
{
    //统一描述错误，可重写
    public $code = 400;
    public $msg = 'invalid parameters';
    public $errorCode = 999;

    /**
     * 构造函数，接收一个关联数组
     * @param array $params 关联数组只应包含code、msg和errorCode，且不应该是空值
     */
    public function __construct($params=[])
    {
        if(!is_array($params)){
            return;
        }
        if(array_key_exists('code',$params)){
            $this->code = $params['code'];
        }
        if(array_key_exists('msg',$params)){
            $this->msg = $params['msg'];
        }
        if(array_key_exists('errorCode',$params)){
            $this->errorCode = $params['errorCode'];
        }
    }
}

自定义全局异常处理

对tp5异常处理类进行重写
application\config.php

return [
  'exception_handle'=>'\app\lib\exception\ExceptionHandler',
];

application\lib\exception\ExceptionHandler.php

<?php

namespace app\lib\exception;

use think\exception\Handle;
use think\Log;
use think\Request;
use Exception;

class ExceptionHandler extends Handle
{
    private $code;
    private $msg;
    private $errorCode;

    public function render(Exception $e)
     {
        //如果这个错误是自己编写的代码抛出的
        if ($e instanceof BaseException)
        {
            $this->code = $e->code;
            $this->msg = $e->msg;
            $this->errorCode = $e->errorCode;
        }
        else{
            // 加个开关，让前后台都能接收到方便阅读的信息
            // config是tp5助手函数，用于读取配置信息
            if(config('app_debug')){
                // 调试状态下需要显示TP默认的异常页面，是供后端人员浏览的信息
                // 不会记录日志
                return parent::render($e);
            }
            $this->code = 500;
            $this->msg = 'sorry，we make a mistake. (^o^)Y';
            $this->errorCode = 999;
            $this->recordErrorLog($e);
        }

        $request = Request::instance();
        $result = [
            'msg'  => $this->msg,
            'error_code' => $this->errorCode,
            'request_url' => $request = $request->url()
        ];
        return json($result, $this->code);
    }

    /*
     * 将异常写入日志
     */
    private function recordErrorLog(Exception $e)
    {
        Log::init([
            'type'  =>  'File',
            'path'  =>  LOG_PATH,
            'level' => ['error']
        ]);
        Log::record($e->getMessage(),'error');
    }
}

新建一个参数错误异常类，继承异常基类

application\lib\exception\ParameterException.php

class ParameterException extends BaseException{
  public $code = 400;
  public $msg = '参数错误';
  public $errorCode = 10000;
}

application\api\validate\BaseValidate.php

<?php
namespace app\api\validate;


use app\lib\exception\ParameterException;
use think\Request;
use think\Validate;

class BaseValidate extends Validate
{
    // 检测所有客户端发来的参数是否符合验证类规则
    public function goCheck()
    {
        $request = Request::instance();
        $params = $request->param();
        //同时校验多个规则
        $result = $this->batch()->check($params);
        if (!$result) {
            $e = new ParameterException([
                'msg' => $this->error,
                'code' => 400,
                'errorCode' => 10002
            ]);
          throw $e;
        } else {
            return true;
        }
    }
}