在PHP中安全地检索网站完全合格的URL？

Question

Have seen lots of individual threads on how to generate a fully qualified website URL, e.g.

https://www.example.com/

The majority of the threads are a few years old and have mentions of security risks with using the code.

Is there a more up to date and secure way of retrieving the qualified URL in PHP?

UPDATE:

I wish to keep a global string, auto-generated, of the top level website address to use in the pages on the website.

Answer 1

$actual_link = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

refer : Get the full URL in PHP