How to redirect to the same page in PHP

My preferred method for reloading the same page is $_SERVER['PHP_SELF']

header('Location: '.$_SERVER['PHP_SELF']);
die;

Don't forget to die or exit after your header();

Edit: (Thanks @RafaelBarros )

If the query string is also necessary, use

header('Location:'.$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']);
die;

Edit: (thanks @HugoDelsing)

When htaccess url manipulation is in play the value of $_SERVER['PHP_SELF'] may take you to the wrong place. In that case the correct url data will be in $_SERVER['REQUEST_URI'] for your redirect, which can look like Nabil's answer below:

header("Location: http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]");
exit;

You can also use $_SERVER[REQUEST_URI] to assign the correct value to $_SERVER['PHP_SELF'] if desired. This can help if you use a redirect function heavily and you don't want to change it. Just set the correct vale in your request handler like this:

$_SERVER['PHP_SELF'] = 'https://sample.com/controller/etc';

Another elegant one is

header("Location: http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]");
exit;

There are a number of different $_SERVER (docs) properties that return information about the current page, but my preferred method is to use $_SERVER['HTTP_HOST']:

header("Location: " . "http://" . $_SERVER['HTTP_HOST'] . $location);

where $location is the path after the domain, starting with /.

To really be universal, I'm using this:

$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' 
    || $_SERVER['SERVER_PORT'] == 443) ? 'https://' : 'http://';
header('Location: '.$protocol.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
exit;

I like $_SERVER['REQUEST_URI'] because it respects mod_rewrite and/or any GET variables.

https detection from https://stackoverflow.com/a/2886224/947370

header('Location: '.$_SERVER['PHP_SELF']);  

will also work