yii2自定义异常

        'errorHandler' => [
            'errorAction' => 'site/error',
            'class' => 'common\library\Exception' //此处新增
        ],

<?php

namespace common\library;

use yii\web\ErrorHandler;

/**
 * 自定义异常
 */
class Exception extends ErrorHandler
{

    /**
     * 重写渲染异常页面方法
     * @param type $exception
     */
    public function renderException($exception) {
        $data = [
            'code' => 500,
            'msg' => $exception->getMessage(),
            'data' => [
                'file' => $exception->getFile(),
                'line' => $exception->getLine()
            ]
        ];
        echo json_encode($data);
        die;
    }
}