invalid path when a page calls itself again

Hi everyone: Suppose please this example: /var/www/html/system/index.php /var/www/html/system/subd1/page1.php The users should call index.php to see the other pages into the /var/www/html/system/ directory the index.php calls itself using a form to authenticate the user Inside page1.php I wrote: if(!$nu_user){ require ("../index.php"); exit; }; It works correctly, but calling index.php through page1.php produces the following error when index.php calls itself the request URL /system/subd1/index.php was not found on this server. index.php exists on /system/, not in /system/subd1/ What should I declare inside of index.php to avoid this error ? thanks in advance Enediel Greetings Enediel Linux user 300141 Happy who can penetrate the secret causes of the things ¡Use Linux!