使用PHP获取脚本的绝对URL？

Question

Basically, I want my script to output its absolute URL, but I don't want to statically program it into the script. For example, if my current URL is http://example.com/script.php I want to be able to store it as a variable, or echo it. i.e. $url = http://example.com/script.php;

But if I move the script to a different server/domain, I want it to automatically adjust to that, i.e. $url = http://example2.com/newscript.php;

But I have no idea how to go about doing this. Any ideas?

Answer 1

$url = "http://" . $_SERVER['HTTP_HOST'] . '/script.php';

If there's a possibility the protocol will change as well (i.e. https instead of http), use this:

$url = ($_SERVER['HTTPS'] ? "https://" : "http://") . $_SERVER['HTTP_HOST'] . '/script.php';