How do I retrieve a uri segment in a hook?

Code:

&lt;?

function pick_language() {



  require_once(APPPATH.'/config/language.php');



  session_start();



  // Lang set in URL

  if(substr( load_class('URI')->_parse_request_uri(), 1))

  {

    $lang = substr( load_class('URI')->_parse_request_uri(), 1);

    $lang = array_shift( explode( '/', $lang ) ); // takes the first segment

    $_SESSION['lang_code'] = $lang;

  }





  // Lang has already been set and is stored in a session

  elseif( !empty($_SESSION['lang_code']))

  {

    $lang = $_SESSION['lang_code'];

  }



  // Still no Lang. Lets try some browser detection then (this happens on the base_url, where no segment is available)

  else if (!empty( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ))

  {

    // explode languages into array

    $accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);



    log_message('debug', 'Checking browser languages: '.implode(', ', $accept_langs));



    // Check them all, until we find a match

    foreach ($accept_langs as $lang)

    {

      // Turn en-gb into en

      $lang = substr($lang, 0, 2);



      // Check its in the array. If so, break the loop, we have one!

      if(in_array($lang, array_keys($config['supported_languages'])))

      {

        break;

      }

    }

  }



  // If no language has been worked out - or it is not supported - use the default

  if(empty($lang) or !in_array($lang, array_keys($config['supported_languages'])))

  {

    $lang = $config['default_language'];

  }



  // Whatever we decided the lang was, save it for next time to avoid working it out again

  $_SESSION['lang_code'] = $lang;



  // Load CI config class

  $CI_config =& load_class('Config');



  // Set the language config. Selects the folder name from its key of 'en'

  $CI_config->set_item('language', $config['supported_languages'][$lang]['folder']);





  // Sets a constant to use throughout ALL of CI.

  define( 'CURRENT_LANGUAGE', $lang );







}



?&gt;

Code:

if ( ! function_exists('get_route'))

{



    function get_route($route,$parameters=NULL)

    {

      /*



      $parameters can be a string if you need to pass just one parameter

      or it can be an array, in which case you have to make sure you pass

      all the parameters in the right order



      example:



      if your route is something like



      blog/browse_by_category/:num/page/:num



      where the first :num is the blog category id and the second :num is the

      page number



      you would pass



      $parameters=array($blog_cat_id,$page_n)



      no regex allowed for this helper, yr

      :any | :num | (:any) | (:num)



      anything else will not work



      */



      // BEGIN



      if($parameters==NULL)

      {

        if(strpos($route,':')) return "get-route-error__did-not-expect-parameters-to-be-null.html";

      }



      else

      {

        if(!is_array($parameters)){

          $parameters=array($parameters);

        }



        $expected_parameters_n=substr_count($route,':');

        $parameters_n=count($parameters);



        if($expected_parameters_n!==$parameters_n) return "get-route-error__n-of-parameters-mismatch-of-expected-parameters.html";



        $route=str_replace("(","",$route);

        $route=str_replace(")","",$route);

        for( $i=0; $i<$parameters_n; $i++ ) {

          $pos=strpos($route,':');

          $sub=substr($route,$pos,4);

          $route=substr_replace($route,$parameters[$i],$pos,4);

        }



      }



      return $route;



  }

}