Thinkphp-php Report notice error after the browser does not display

thinkphpphp

Title, my script ran the Times with this error: Notice:use of undefined constant ROOT -assumed ' __root__ ' in (this is the data I returned after I used the software to simulate the browser post data). However, if it is accessed by a browser, no data will be returned. But I just need to add error_reporting (0) before the output or double quotes to the constant and the browser will be able to output normally. I'm using the XAMPP kit. I guess it's Apache's problem. But both Baidu and Google have found a reason. I use the thinkphp3.1. Does anyone know?

