Fw: [PHP] invalid path when a page calls itself again

Thanks Kevin for your answer: I emphasize that require (../index.php) works because I see the page index.php finally in the browser, the problem is when this page calls itself to authenticate the user, It's seems like the page tries to find itself into the /system/subd1/ directory. When I called

Fw: [PHP] invalid path when a page calls itself again SOLUTION

Thanks Kevin for your advice: The form included into the index.php had declared the 'action' parameter this way: action=index.php , and the error ocurred. I took your advice and changed this value by action = http://?echo $HTTP_SERVER_VARS['HTTP_HOST']?/system/index.php. In asp,