new Exception('错误信息(默认为空)','错误代码(默认0)','异常链中前一个异常')

e -> getMessage() 获取异常信息
e -> getCode() 获取异常错误码

        try {//可能抛出异常代码throw new Exception("Error Processing Request", 1);    } catch (Exception $e) {// 1. 记录日志// 2. 处理异常，程序继续进行 / 继续向上抛出异常 / 终止程序，打印异常错误}

<?php
namespace app\common\exception;use Exception;
use think\exception\Handle;
use think\facade\Request;
use think\Log;class ExceptionHandler extends Handle {private $code;private $msg;private $errorCode;public function render(Exception $e) {if ($e instanceof BaseException) {//如果是自定义异常，则控制http状态码，不需要记录日志//因为这些通常是因为客户端传递参数错误或者是用户请求造成的异常//不应当记录日志$this->code = $e->code;$this->msg = $e->msg;$this->errorCode = $e->errorCode;} else {// 如果是服务器未处理的异常，将http状态码设置为500，并记录日志if (config('app_debug')) {// 调试状态下需要显示TP默认的异常页面，因为TP的默认页面// 很容易看出问题return parent::render($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');}}

    // 异常处理handle类 留空使用 \think\exception\Handle'exception_handle' => '\app\common\exception\ExceptionHandler',

<?php
namespace app\common\exception;
use think\Exception;/*** Class BaseException* 自定义异常类的基类*/
class BaseException extends Exception {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'];}}
}

<?phpnamespace app\common\exception;class UserException extends BaseException {public $code = 404;public $msg = '用户不存在';public $errorCode = 60000;
}

    try {//todo...throw new \app\common\exception\UserException();} catch (Exception $e) {}

{"msg": "用户不存在","error_code": 60000,"request_url": "/wx_shop/public/index.php/admin/banner/list"
}