//if they logon token is not set, do the soap call and set the session
if(!isset($_SESSION['logontoken'])){

$parameters = new stdClass();
$parameters->WeblineNumber = WEBLINE_NUMBER;
$parameters->UserName = USERNAME;
$parameters->Password = PASSWORD;

$result = $client->GetWeblineLogonToken($parameters);

$_SESSION['logontoken'] = $result->GetWeblineLogonTokenResult->LogonToken;