maintaining session in directory traversal using php -


i'm new php ... i'm trying maintain session in directory traversal script ... every time go sub directory session variables lost ...
right script looks - 

start_session();            //login , authenticate using functions in included scripts  //(include(login.php);include(auth.php)) , set session variables accordingly    if (session variable set) {     //start traversal script }

so want know how can manage session in directory traversal ....can me out here ...

http://www.php.net/manual/en/function.session-start.php

session_start();  if (isset($_session['directory_path'])) {    $directory_path = $_session['directory_path']; } else {    $directory_path = 'default/path'; }  // traverse path  $_session['directory_path'] = $new_directory_path;

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