isset($_SESSION) question

[timecut]

Hi there, i'm modifying a script which handles a member area but i can't get the utility of a couple of lines and the php manual is not enought clear for me on the matter. Basically after a user login (which username and password), the script start a session and store and pass the value of the username:

  $_SESSION['username'] = stripData($_POST['username']);

then close the session and jump on the 1st page of the members area. Here, the page requires a file for the security controls which contains few lines and the ones i can't understand... those are (in red):

  if (!isset($_SESSION['username'])) {

if (isset($_SESSION)) {

  while (list ($key, $val) = each ($_SESSION)) {

session_unregister($key);

  }

  session_destroy();

}

header("Location: ./login.php");

exit();

}

Could anyone gives me an help to understand what's goin' on with that list function?!? the script works fine but this function is new to me and is the only thing i can't understand so really would like to get on it! cheeeeeeeeeeeeers!!!

 

 

 

[trq]

Its basically exactly the same as...

 

<?php

  foreach($_SESSION as $k => $v)) {
    session_unregister($k);
  }

?>

 

is that easier to understand?

[timecut]

much easier!!! thanx a lot. there's so many way for the same target using php, and i get lost easily with the syntax. i got it now. many thanx again