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phpconstantsrequire-once

Define CONSTANT not working, why?

I've defined on config.php:

define('ROOT', __DIR__);

and on index.php:

require_once (ROOT.'/header.php');

result:

Notice: Use of undefined constant ROOT - assumed 'ROOT'

Why ROOT constant isn't working? I'm learning, someone could explain me?

EDIT

If I put:

require_once (__DIR__.'/header.php');

It works. Someone could explain me why?

Solution

  • It wasn't working cause ROOT was defined inside 'header.php'.

    It needs to be defined before call header.php.

    Thanks for any help.