php - Why are my cookies not setting?

Question

I have the following PHP function:

function validateUser($username){
    session_regenerate_id (); 
    $_SESSION['valid'] = 1;
    $_SESSION['username'] = $username;
    setcookie('username2',$username,time()+60*60*24*365);
    header("Location: ../new.php");
}

And then I fetch the cookie:

echo $_COOKIE['username2']; exit();

(I only put exit() for debugging purposes)

Only problem, it's coming out blank. Any ideas?

UPDATE: This is how the function is called:

    if(mysql_num_rows($queryreg) != 0){
    $row = mysql_fetch_array($queryreg,MYSQL_ASSOC);
    $hash = hash('sha256', $row['salt'] . hash('sha256', $password));
    if($hash == $row['password']) {
        if($row['confirm'] == 1){
            if(isset($remember)){
                setcookie('username',$username,time()+60*60*24*365);
                setcookie('password',$password,time()+60*60*24*365);
            } else {
                setcookie('username','',time()-3600);
                setcookie('password','',time()-3600);
            }
            validateUser($username);

I didn't include all the if() statements to save some space.

Answer 1

try adding the path = /, so that the cookie works for the whole site not just the current directory (that has caught me out before)

example

setcookie('password',$password,time()+60*60*24*365, '/'); 

also make sure the cookie is the first thing being output as advised in the php manual (this has caught me out before too)

Like other headers, cookies must be sent before any output from your script (this is a protocol restriction).