conditional redirect depending on URL

[defroster]

Hello, I have just started with php. I can not see what I have done wrong here. Please help. /David Froster

<?php

if($_SERVER['HTTP_HOST'] != blue.sunet.se)
{
header("Location: http://red.sunet.se")
}

?>

[navdmk]

try using "blue.sunet.se".

[defroster]

thanks, tried both "blue.sunet.se" and 'blue.sunet.se' but none of them work unfortuntely. any other hint.?

[defroster]

is this a difficult problem? i thought it was pretty common??