Wordpress Exec-PHP Plugin Question

Hi,

I am having some trouble with using the Exec-PHP plugin. I am trying to request the 'id' within a post, but it does not seem to be pulling in the session ID. Here is the code that creates the session ID.

<?php
    /* Add This code each target page*/
    /*********************************/
    session_start();
    if($_REQUEST['id']){
        $_SESSION['id'] = $_REQUEST['id'];
        $host  = $_SERVER['HTTP_HOST'];
        $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $hidden = "http://" . $host . $uri;
        //header("Location: " . $hidden);
        header("Location: ?");
    }
    $id = $_SESSION['id'];
    /*********************************/
?>

PHP:

In the Wordpress post I am requesting the ID with the following code.
<?=$id;?>

Does Exec-PHP recognize <?=$id;?> or do I need to format it differently? Thanks in advance for your help.