php - header location redirect: https to https, http to http

Question

How do I properly use header function, so

header("location: http://".$_SERVER['HTTP_HOST']."/?para=abc"); //for http

and

header("location: https://".$_SERVER['HTTP_HOST']."/?para=abc"); //for https

could be written in 1 string if possible?

.htaccess file will take care of all http pages to be redirected to https with no problem, but I believe it makes sense to use a proper syntax for http/https pages in header("location:...), so it is correct for all browsers.

Answer 1

You could also use the following code:

header("Location: //www.google.com");

Answer 2

$protocol='http';
if (isset($_SERVER['HTTPS']))
  if (strtoupper($_SERVER['HTTPS'])=='ON')
    $protocol='https';

header("location: $protocol://".$_SERVER['HTTP_HOST']."/?para=abc");