What are the advantages and disadvantages of using absolute URIs versus relative URIs in the header location function in PHP?

When using the header location function in PHP to redirect users to a different page, it is important to specify the URI correctly. Absolute URIs include the full URL of the destination page, while relative URIs only include the path from the current page. Advantages of using absolute URIs include ensuring that the user is redirected to the correct page regardless of the current URL, while disadvantages include the need to update the URI if the domain changes. On the other hand, advantages of using relative URIs include easier maintenance when moving the site to a different domain, while disadvantages include potential issues with redirection if the current URL structure changes. To implement the fix of using absolute URIs in the header location function in PHP, you can use the following code snippet:

// Redirect to an absolute URI
$redirect_url = "https://www.example.com/newpage.php";
header("Location: $redirect_url");
exit();