What is the significance of using absolute URLs in header redirects in PHP scripts, and how can they be implemented effectively?

Using absolute URLs in header redirects in PHP scripts ensures that the redirect will work correctly regardless of the current URL or file structure. This is important because relative URLs can be interpreted differently depending on the context, leading to potential errors or broken redirects. To implement absolute URLs effectively, simply specify the full URL including the protocol, domain, and path in the header function.

// Redirect using an absolute URL
$redirect_url = "http://www.example.com/newpage.php";
header("Location: $redirect_url");
exit();