Header location is not working on live server

Question

I Have one registration and payment page. program flow is like registration > confirmation > payment. After validation and calculation in registration page need to go to confirm

Answer 1

$host  = $_SERVER['HTTP_HOST'];
$uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
$extra = 'confirm.php';
header("Location: http://$host$uri/$extra");