A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_USER_AGENT

Filename: core/MY_Controller.php

Line Number: 37

Backtrace:

File: E:\wamp64\www\ndgjzx\application\core\MY_Controller.php
Line: 37
Function: _error_handler

File: E:\wamp64\www\ndgjzx\application\controllers\Doc.php
Line: 16
Function: __construct

File: E:\wamp64\www\ndgjzx\index.php
Line: 292
Function: require_once

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