1、创建ErrorHandler，继承这个yii\base\ErrorHandler抽象类，然后定义这个父类中的抽象方法

request->getIsAjax()){
            exit( json_encode( array('code' =>$exception->getCode(),'msg'  =>$exception->getMessage()) ));
        }else{
            //将500的代码，发送监控预警
            if(!empty($exception->getCode()) && $exception->getCode() ==8){
                $params = [];
                $params['projectName'] = "oct-youban";
                $params['level'] = 5;
                $params['title'] = "500：".$exception->getMessage();
                $params['value'] = $exception->getCode();
                $params['message'] = $exception->getFile()."：".$exception->getLine();
                $params['bizcode'] = 8;
                $params['subcode'] = 8001;
                EarlyWarning::WarninApi($params);
            }
            echo  Yii::$app->getView()->renderFile($this->errorView,['exception' => $exception,],$this);
        }
    }
}

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2、创建视图文件 ： @app/views/errorHandler/error.php

    
    
    
    
    
    
    
    
    
    



    
    

        
getCode())&&($exception->getCode() == 8)){echo "出错啦";}else{ echo $exception->getMessage();}?>