Simple if..else question

[Anon]

Hello,

When I use the following syntax:

if ($username = "Test")
{
header("Location: $second_page?.SID");
}
elseif ($username = "Test2")
{
header("Location: $first_page?.SID");
}

I always get to $second_page. So with username Test2 I will be redirected to $second_page. Why?

[Anon]

$username == "Test" rather than $username = "Test"

[Anon]

THANKS!!!