help starting session

[MDanz]

<?php 
$w = $_GET['w'];
$h = $_GET['h'];

$_SESSION['width']= $w;
$_SESSION['height']=$h;

?>

 

$w and $h stands for width and height which i get from the url from the page.  To prevent always storing the width and height in the url for every page, i'd like to store it in a session.  Above i think i've stored it correctly. 

 

 

How do i started the session.  Does this start all sessions?

 

<?php  session_start(); ?>

[PravinS]

Write session_start() at the top of every page where you need session variables.

[MDanz]

how do i stop a specific session?  i know its session_destroy(); but for a particular session?

[PravinS]

Use session_unregister(VARIABLE)