How to Find the Current URL with PHP

source: http://discomoose.org/2005/11/02/how-to-find-the-current-url-with-php/

<?php
// find out the domain:
$domain = $_SERVER['HTTP_HOST'];

// find out the path to the current file:
$path = $_SERVER['SCRIPT_NAME'];

// find out the QueryString:
$queryString = $_SERVER['QUERY_STRING'];

// put it all together:
$url = "http://" . $domain . $path . "?" . $queryString;
echo "The current URL is: " . $url . "<br />";

// An alternative way is to use REQUEST_URI instead of both
// SCRIPT_NAME and QUERY_STRING, if you don't need them seperate:
$url2 = "http://" . $domain . $_SERVER['REQUEST_URI'];
echo "The alternative way: " . $url2;
?>