一样的代码为什么会出现错误

Question

<?php 

define("ROOT", dirname('_FILE_'));

set_include_path(".".PATH_SEPARATOR.ROOT."/lib".PATH_SEPARATOR.ROOT."/core".PATH_SEPARATOR.get_include_path());

require_once'image.func.php';

require_once'string.func.php';

 ! ) Notice: Use of undefined constant _FILE_ - assumed '_FILE_' in D:\wamp\www\shopImooc\include.php on line 3

Answer 1

ni看看你这个FILE变量定义写得有问题没？

Answer 2

 __FILE__FILE前后一共四条下划线