Function to parse URI segments.

uri-segments.php

<?php
function uri($segment=NULL, $qs=false){
	$uri = $_SERVER['REQUEST_URI'];
	if(!$qs || $segment !== NULL){
		if(strpos($uri, '?')){
			list($uri, $query) = explode('?', $uri);
		}
		if($segment !== NULL){
			if(is_string($segment)){
				if($segment != 'last'){
					return ( strlen($uri) >= strlen($segment) && substr($uri, 0, strlen($segment)) );
				}
			}
			$str = trim($uri, '/');
			$segments = (strpos($str, '/')) ? explode('/', $str) : array($str);
			$ttl = count($segments);
			if(is_string($segment) && $segment == 'last'){
				$seg = array_pop($segments);
			} elseif($segment <= $ttl){
				if($segment < 0) $segment = $ttl - abs($segment) + 1;
				$seg = $segments[$segment-1];
			} else {
				return '';
			}
			
			return $seg;
		}
	}
	return $uri;
}

usage.php

<?php
// uri:  http://www.mysite.com/some-controller/some-method/
 
echo uri();
// displays: /some-controller/some-method/
 
echo uri(2);
// displays: some-method
 
// Pass true into 2nd paramater ($qs) to display Query String with URI
// uri:  http://www.mysite.com/some-controller/?foo=bar&bar=foo
 
echo uri(NULL, true);
// displays: /some-controller/?foo=bar&bar=foo