Sessions zo lang mogelijk

//proc all page display
include('lang.php'); //language detector
class Session
{
	var $lang;     	   //Username given on sign-up
	var $url;          //The page url current being viewed
    var $referrer;     //Last recorded site page viewed
	
	/* Class constructor */
   function Session(){
      $this->time = time();
      $this->startSession();
   }
   
   function cf($filename){//function to clean a filename string so it is a valid filename
   		$fp = explode('/',$filename);
		$num = count($fp);
		return $fp[$num-1];
	}
  
   /**
    * startSession - Performs all the actions necessary to 
    * initialize this session object. Tries to determine if the
    * the user has logged in already, and sets the variables 
    * accordingly. Also takes advantage of this page load to
    * update the active visitors tables.
    */
   function startSession(){
   		session_start();   //Tell PHP to start the session
		
		/* Set referrer page */
      if(isset($_SESSION['url'])){
         $this->referrer = $search = $this->cf($_SESSION['url']);
      }else{
         $this->referrer = "/";
      }

      /* Set current url */
      $this->url = $_SESSION['url'] = $this->cf($_SERVER['PHP_SELF']);
	  
	  /* Set user-determined language: */
	  	//set up languages array:
		  $langs = array('en','nl');
		//
	  if(isset($_GET['lang'])){
	  	if(in_array($_GET['lang'],$langs)){
			$this->lang =  $_SESSION['lang'] = $_GET['lang'];
		}
	  }
	  if(!isset($_SESSION['lang']) || !in_array($_SESSION['lang'],$langs)){
	  	  $this->lang = $_SESSION['lang'] = language();
	  }
	}
};
/**
 * Initialize session object - This must be initialized before
 * the form object because the form uses session variables,
 * which cannot be accessed unless the session has started.
 */
$session = new Session;
			  	  	
?>

//proc all page display
include('lang.php'); //language detector
class Session
{
	var $lang;     	   //Username given on sign-up
	var $url;          //The page url current being viewed
    var $referrer;     //Last recorded site page viewed
 
	/* Class constructor */
   function Session(){
      $this->time = time();
      $this->startSession();
   }
 
   function cf($filename){//function to clean a filename string so it is a valid filename
   		$fp = explode('/',$filename);
		$num = count($fp);
		return $fp[$num-1];
	}
 
   /**
    * startSession - Performs all the actions necessary to 
    * initialize this session object. Tries to determine if the
    * the user has logged in already, and sets the variables 
    * accordingly. Also takes advantage of this page load to
    * update the active visitors tables.
    */
   function startSession(){
   		session_start();   //Tell PHP to start the session
 
		/* Set referrer page */
      if(isset($_SESSION['url'])){
         $this->referrer = $search = $this->cf($_SESSION['url']);
      }else{
         $this->referrer = "/";
      }
 
      /* Set current url */
      $this->url = $_SESSION['url'] = $this->cf($_SERVER['PHP_SELF']);
 
	  /* Set user-determined language: */
	  	//set up languages array:
		  $langs = array('en','nl');
		//
	  if(isset($_GET['lang'])){
	  	if(in_array($_GET['lang'],$langs)){
			$this->lang =  $_SESSION['lang'] = $_GET['lang'];
		}
	  }
	  if(!isset($_SESSION['lang']) || !in_array($_SESSION['lang'],$langs)){
	  	  $this->lang = $_SESSION['lang'] = language();
	  }
	}
};
/**
 * Initialize session object - This must be initialized before
 * the form object because the form uses session variables,
 * which cannot be accessed unless the session has started.
 */
$session = new Session;
 
?>