Creating a session variable with PHP

I use this -

<?php

if (!isset($_SESSION)) {
session_start();
}
?>

at the top of the page, and then this within the code block where you are
processing the form's data -

$_SESSION['usermail']= $_POST['sub_email'];

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"Jugdish" <webforumsuser@macromedia.com> wrote in message
news:gb8aov$691$1@forums.macromedia.com...
> Can anyone offer me a PHP script that creates a session variable? The
> Dreamweaver CS3 Help documentation offers coding samples for ColdFusion
> and ASP
> but not for PHP. I tried this without success:
> "$_SESSION['usermail']= $_POST['sub_email'];" in which I am trying to
> capture
> an email address from a form and save it to use in a confirmation email to
> a
> new subscriber. Any help would be sincerely appreciated.
> najrellim@gmail.com
>