php - header("Location:/"); redirect works on localhost, but not on remote server

Question

if (condition)
{
#lol. Some code here
}
else
{       
header("Location:/");//i'm trying to redirect to the root
}

Redirect works perfectly on localhost, but not on remote server. May be it's all better to use $_SERVER? This redirect wouldn't work even if i choose file in the same directory as file with redirect. Hope you help me :)

Answer 1

From the manual:

HTTP/1.1 requires an absolute URI as argument to ? Location: including the scheme, hostname and absolute path, but some clients accept relative URIs. You can usually use $_SERVER['HTTP_HOST'], $_SERVER['PHP_SELF'] and dirname() to make an absolute URI from a relative one yourself:

<?php
/* Redirect to a different page in the current directory that was requested */
$host  = $_SERVER['HTTP_HOST'];
$uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\');
$extra = 'mypage.php';
header("Location: http://$host$uri/$extra");
exit;
?>