Usefull for site located in subdirectories. Usage: put it in script located in the "home directory" of your site

get_base.php

<?php
function get_base() {
	
	$scriptSubDir = str_replace(dirname(__FILE__), '', str_replace('\\', '/', $_SERVER['SCRIPT_FILENAME']));
	$baseURI = str_replace($scriptSubDir , '', str_replace('\\', '/',$_SERVER['SCRIPT_NAME']) );	
	$baseURI = preg_replace('/^\//', '', $baseURI);
	$baseURI = preg_replace('/\/$/', '', $baseURI);
	
	return $baseURI;
}
?>