<?php
  
  // load the URL factory library
  require_once 'url_factory.inc.php';
  
  // redirect requests to index.php and index.html to the root
  function fix_index_url()
  {
    // if the request is for index.php we redirect to ./
    if (preg_match('#(.*)index\.(html|php)$\#\text{'},$_SERVER['REQUEST_URI'], $captures))\; \{$// perform a 301 redirect to the new URL
      header('HTTP/1.1 301 Moved Permanently');
      header('Location: ' . captures[1]);
    }
  }
  
  // redirects to proper URL if not already there
  function fix_category_product_url()
  {   
    // obtain the proper URL of the current category/product page
    $proper\_url\; =\; get\_proper\_category\_product\_url();$// 301 redirect to the proper URL if necessary
    if (SITE_DOMAIN . _SERVER['REQUEST_URI'] != $proper\_url)\; \{\; header(\text{'}HTTP/1.1\; 301\; Moved\; Permanently\text{'});\; header(\text{'}Location:\; \text{'}\; .$proper_url);
      exit();     
    }
  }
  
  // returns the proper keyword-rich URL 
  function get_proper_category_product_url()
  {
    // retrieve product and category IDs from the query string
    $product\_id\; =$_GET['product_id'];
    $category\_id\; =$_GET['category_id'];
  
    // retrieve product and category names from fictional database
    $product\_name\; =$GLOBALS['products'][$product\_id];$category_name = $GLOBALS[\text{'}categories\text{'}][$category_id];
  
    // create keyword-rich URL
    $proper\_url\; =\; make\_category\_product\_url($category_name, $category\_id,$product_name, $product\_id);$// redirect to keyword-rich URL if not already there
    return proper_url;
  }
  
  ?>