relative path in require_once doesn't work

Use

__DIR__

to get the current path of the script and this should fix your problem.

So:

require_once(__DIR__.'/../class/user.php');

This will prevent cases where you can run a PHP script from a different folder and therefore the relatives paths will not work.

Edit: slash problem fixed

for php version 5.2.17 __DIR__ will not work it will only works with php 5.3

But for older version of php dirname(__FILE__) perfectly

For example write like this

require_once dirname(__FILE__) . '/db_config.php';

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