Do all header("Location: member.php?id=$username") have to be the first thing in a script? (PHP)
<p>I know in the Manuel it says that the header has to be the first thing in a script, but how come I see some codes where <strong>header("Location: member.php?id=$username")</strong> is in a if-statement?</p>

<p>Ex:</p>

<pre><code>//a bunch of codes above

if($result!="0"){ 
// authenication correct lets login
$_SESSION["password"] = $password;;
$_SESSION["username"] = $username;
header("Location: member.php?id=$username");
}
else 
{
    echo "Wrong username or password. Please try again!";
}
</code></pre>

<p>But when I do this, it sometimes would/won't throw an error. 
How do I allow the header (); to be used in a script without any errors?
I want to redirect the user back to the login if they click "no" and to the homepage if they click "yes".</p>
