Determines the path and url to the current file. Handles HTTPS and mod_rewrite.

RootPathDeterminer.php

<?php
// Define root path constant. $_SERVER['SCRIPT_FILENAME'] seems to survive
// redirects.
$root_path = dirname($_SERVER['SCRIPT_FILENAME']);
if(substr($root_path,-1) != '/') {
	$root_path .= '/';
}
define('ROOT_PATH',$root_path);
unset($root_path);

// Define root url constant
$root_url = isset($_SERVER['HTTPS']) ? 'https://' : 'http://';
$root_url .= $_SERVER['HTTP_HOST'] . '/';
$root_url .= substr(ROOT_PATH,
				strpos(
					ROOT_PATH,
					$_SERVER['DOCUMENT_ROOT']
				) + strlen($_SERVER['DOCUMENT_ROOT']) + 1);
define('ROOT_URL',$root_url);
unset($root_url);
?>