location header in code

Hi,

What is suppose to do:

f($password1 != $password2)
{      
    header("Location: registration.html");
}

i don't know what happens, is this supposed to exit the rest of the code?, because i run it and still writing in my table on the database. Any idea?

<?php
//retrieve our data from POST
$username = $_POST['username'];
$password1 = $_POST['password1'];
$password2 = $_POST['password2'];
$email = $_POST['email'];
 
if($password1 != $password2)
{	
    header("Location: registration.html");
}
if(strlen($username) > 30)
{
    header("Location: registration.html");
}
	
$hash = hash('sha256', $password1);
 
function createSalt()
{
    $text = md5(uniqid(rand(), true));
    return substr($text, 0, 3);
}
 
$salt = createSalt();
$password = hash('sha256', $salt . $hash);

$conn = mysql_connect('localhost', 'root', 'root');
mysql_select_db('login', $conn);
 
//sanitize username
$username = mysql_real_escape_string($username);
 
$query = "INSERT INTO member ( username, password, email, salt )
        VALUES ( '$username', '$password', '$email', '$salt' );";
mysql_query($query);
 
mysql_close();
 
header('Location: index.html');
?>

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