Get URI

get_uri.php

<?php
/**
 * Get's the current "pretty" URI from the URL.  It will also correct the QUERY_STRING server var and the $_GET array.
 * It supports all forms of mod_rewrite and the following forms of URL:
 * 
 * http://example.com/index.php/foo (returns '/foo')
 * http://example.com/index.php?/foo (returns '/foo')
 * http://example.com/index.php/foo?baz=bar (returns '/foo')
 * http://example.com/index.php?/foo?baz=bar (returns '/foo')
 * 
 * Similarly using mod_rewrite to remove index.php:
 * http://example.com/foo (returns '/foo')
 * http://example.com/foo?baz=bar (returns '/foo')
 * 
 * @author      Dan Horrigan <http://dhorrigan.com>
 * @copyright   Dan Horrigan
 * @license     MIT License <http://www.opensource.org/licenses/mit-license.php>
 * @param   bool    $prefix_slash   whether to return the uri with a '/' in front
 * @return  string  the uri
 */
function get_uri($prefix_slash = true)
{
    if (isset($_SERVER['PATH_INFO']))
    {
        $uri = $_SERVER['PATH_INFO'];
    }
    elseif (isset($_SERVER['REQUEST_URI']))
    {
        $uri = $_SERVER['REQUEST_URI'];
        if (strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)
        {
            $uri = substr($uri, strlen($_SERVER['SCRIPT_NAME']));
        }
        elseif (strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)
        {
            $uri = substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));
        }

        // This section ensures that even on servers that require the URI to be in the query string a correct
        // URI is found, and also fixes the QUERY_STRING server var and $_GET array.
        if (strncmp($uri, '?/', 2) === 0)
        {
            $uri = substr($uri, 2);
        }
        $parts = preg_split('#\?#i', $uri, 2);
        $uri = $parts[0];
        if (isset($parts[1]))
        {
            $_SERVER['QUERY_STRING'] = $parts[1];
            parse_str($_SERVER['QUERY_STRING'], $_GET);
        }
        else
        {
            $_SERVER['QUERY_STRING'] = '';
            $_GET = array();
        }
        $uri = parse_url($uri, PHP_URL_PATH);
    }
    else
    {
        // Couldn't determine the URI, so just return false
        return false;
    }
    
    // Do some final cleaning of the URI and return it
    return ($prefix_slash ? '/' : '').str_replace(array('//', '../'), '/', trim($uri, '/'));
}