<?php
/**
 * friendlyUrl.php
 * Created by Komma Mediadesign.
 * Author: mike
 * Date: 3/19/13
 */
function initFriendlyUrl($urlCountStart = 0, $addLanguage = 0)
{
    /**
     * 1. Get the REQUEST_URI and explode this on '/'
     */
    $stringUrl = substr($_SERVER['REQUEST_URI'], 1);
    $urls = explode('/', $stringUrl);

    /**
     * 2. If we have a language, the structure will be root.com/lang/page/sub/sub2/sub3
     * Check if the lang is valid, else header 404.
     * If no language is set, header to "nl".
     */
    $urlCount = $urlCountStart;
    if ($addLanguage) {
        $languages = ['nl', 'en'];
        $default = $languages[0];

        if (isset($urls[$urlCount]) && ! empty($urls[$urlCount])) {
            $lang = trim(urldecode($urls[$urlCount]));
            if (in_array($lang, $languages)) {
                define('URL_LANG', $lang);
                define('LANG_ROOT', SITE_ROOT.$lang.'/');
            } else {
                header('HTTP/1.0 404 Not Found');
                header('location: '.SITE_ROOT.$default.'/404');
                exit;
            }
        } else {
            // redirect to default page
            header('HTTP/1.1 301 Moved Permanently');
            header('Location: '.SITE_ROOT.$default.'/');
            exit;
        }
        $urlCount++;
    }

    /**
     * 3. The second - or first if ! $addLanguage - GET-variable is $page
     */
    if (isset($urls[$urlCount]) && ! empty($urls[$urlCount])) {
        $page = trim(urldecode($urls[$urlCount]));
        if (! empty($page)) {
            define('URL_PAGE', $page);
            $urlCount++;
        }
    }

    /**
     * 4. All the other get variables are called sub, sub2, sub3 etc.
     */
    $subtract = $addLanguage + $urlCountStart;
    if (count($urls) > $urlCount) {
        for ($i = $urlCount; $i <= count($urls); $i++) {
            if (isset($urls[$i])) {
                $value = trim(urldecode($urls[$i]));
                $name = 'URL_SUB';
                if ($i > $urlCount) {
                    $name .= $i - $subtract;
                } // bv. -kms & -lang = -2
                if ($value != '') {
                    define($name, $value);
                }
            }
        }
    }
}