Question

I m curious to know that is there any diffrence between

header('Location:index.php'); // using  capital  `L`
exit(); // using parenthesis

AND

header('location:index.php');
exit;

which one we should recommend to use?

Answer 1

According to the actual RFC for HTTP, you should use an uppercase "L", and an absolute URI:

header('Location: http://www.mysite.com/index.php');

As far as exit vs exit(), there is no difference. It is a language construct, not a function, and the parenthesis are optional. You may even use exit 0 or exit(0).