tp6 全局异常处理

在写api接口时，当从服务器返回的值不是我们期望的值时都属于异常。包括了非服务器异常（用户行为造成的），服务器异常。为了更直观的用json型式通知给用户，需要定义类进行接管

1. 需要在app目录下面的provider.php文件中绑定异常处理类
   // 绑定自定义异常处理handle类
   ‘think\exception\Handle’ => ‘\app\lib\exception\ExceptionHandler’

2.在app目录下创建目录lib\exception\
并创建两个类ExceptionHandler BaseException

<?php
namespace app\lib\exception;
use think\exception\Handle;
use think\facade\Env;
use think\Response;
use Throwable;
class ExceptionHandler extends Handle
{
    private $msg ="服务器异常";
    private $httpcode =500;
    private $errorcode =19999;
    public function render($request, Throwable $e): Response
    {
//        是否处于调试状态下，当处于调试状态下就返回html格式的错误信息。否则返回json格式的错误提示
        if(Env::get("APP_DEBUG")==1 && !$e->getCode())
            {
                // 其他错误交给系统处理
                return parent::render($request, $e);
            }
//        如果是服务器异常返回预先设置好的
            if($e instanceof BaseException){
                $this->msg = $e->getMessage()?:$this->msg;
                $this->httpcode = $e->getStatusCode()?:$this->httpcode;
                $this->errorcode = $e->getCode()?:$this->errorcode;
            }
//            如果是服务器异常就返回服务器异常提示
            $result_data = [
                'message'=>$this->msg,
                'data'=>[],
                'errorcode'=>$this->errorcode
            ];
            return json($result_data,$this->httpcode);
        }
}

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2021 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);
namespace app\lib\exception;
use Exception;
/**
 * HTTP异常
 */
class BaseException extends \RuntimeException
{
    private $statusCode;
    private $headers;
    public function __construct(int $statusCode, string $message = '', $code = 0, Exception $previous = null, array $headers = [])
    {
        $this->statusCode = $statusCode;
        $this->headers    = $headers;
        parent::__construct($message, $code, $previous);
    }
    public function getStatusCode()
    {
        return $this->statusCode;
    }
    public function getHeaders()
    {
        return $this->headers;
    }
}

在控制器中需要抛出异常的地方写入
throw new BaseException(400,”异常描述”,19999);

即可

BaseException类是对HttpException类初始化参数位置作了调整，对HttpException 中的__construct(int $statusCode, string $message = ‘’, Exception $previous = null, array $headers = [], $code = 0)

改成
__construct(int $statusCode, string $message = ‘’, $code = 0, Exception $previous = null, array $headers = [])

当实例化时后面不需要的参数可以省略不填，代码更加简洁