PHP Sessions using $_SESSION

Hello

Having trouble retrieving the session variables.

I am using the $_SESSION variable to store the sessions and the values are set.  However on the next page load, the values are lost and the user is not logged in.

I am just trying to do a simple authentication...

here is my code:
<index.php>
<?
include "sessions-lib.php";
include "auth-lib.php";
authenticate_user();
echo "i am logged in";
?>

<sessions-lib.php>
<?
session_name('restricted_area');
session_start();
?>

<auth-lib.php>
function authenticate_user() {
    global $reseller_id,$password,$attempt_login;

    if (isset($reseller_id) && isset($password) && isset($attempt_login) ) {
        attempted_login($reseller_id,$password);
    }
    elseif( isset($_SESSION["reseller_id"]) && isset($_SESSION["is_authorised"]) ) { #check for existing session
        return 1;
    }
    else {
        display_login_form();
        exit;
    }

    # else continue ...

}

function attempted_login($reseller_id,$password) {
    # authenticate user if details are correct
    $reseller_id    = ereg_replace(" ","",$reseller_id);
    $password       = ereg_replace(" ","",$password);
    if(!authenticate_user($reseller_id,$password))
    display_login_form('Unable to authorise. Supplied details are incorrect.');
        exit;
    }

    $_SESSION["reseller_id"]    = $reseller_id;
    $_SESSION["is_authorised"]  = 1;

    return true;
}
?>

so the index page includes the sessions-lib which should load the available sessions in and initialise $_SESSION ?

then when authenticate_user() is called, it should be able to see the session variables.

all it does is
1. display_login_form()
    so u enter your details
2. shows index page "i am logged in"
3. reload page and u will be prompted with the display_login_form() .

any ideas?  do i have to anything further to set the session variables?

have been to php.net and looked through there for an hour or so but i must be missing somthing.

thanks heaps for your help :)

Cheers

Steve





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