How can PHP developers ensure that their code for redirecting from HTTP to HTTPS is efficient and error-free?

To ensure that their code for redirecting from HTTP to HTTPS is efficient and error-free, PHP developers can use server-side redirection techniques instead of relying solely on client-side JavaScript. This can be done by checking if the current request is using HTTP and then redirecting to the HTTPS version of the URL. By implementing this server-side redirection logic, developers can ensure that all requests are properly redirected without relying on client-side scripts, making the process more efficient and reliable.

// Check if the current request is using HTTP
if (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != 'on') {
    // Redirect to the HTTPS version of the URL
    header('Location: https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit();
}